Sp 1099 Electrical Installation Practice.pdf

Petroleum Development Oman L.L.C. SP-1099 Specification for Electrical Installation Practice

Document ID

Document Type

Security

Discipline

Owner

Issue Date

Version

SP-1099

Specification

Restricted

Electrical

UIE (UEE) – CFDH-Electrical

Nov-16

6.0

Keywords: This document is the property of Petroleum Development Oman, LLC. Neither the whole nor any part of this document may be disclosed to others or reproduced, stored in a retrieval system, or transmitted in any form by any means (electronic, mechanical, reprographic recording or otherwise) without prior written consent of the owner.

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Specification for Electrical Installation Practice

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ii Document Authorisation Authorised For Issue

User Note: The requirements of this document are mandatory. Non-compliance shall only be authorised by the Document Owner or his Delegate through STEP-OUT approval. A controlled copy of the current version of this document is on PDO's EDMS. Before making reference to this document, it is the user's responsibility to ensure that any hard copy, or electronic copy, is current. For assistance, contact the Document Custodian or the Document Controller. Users are encouraged to participate in the ongoing improvement of this document by providing constructive feedback.

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Specification for Electrical Installation Practice

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iii Revision History The following is a brief summary of the 4 most recent revisions to this document. Details of all revisions prior to these are held on file by the issuing department.

Version No. Version 3.0

Date Aug 03

Author

Version 4.0

Dec. 06

Version 5.0

Sept 02

Saif Al Harthy, Head, Integrity & Standards, Power Systems TTE/4

Version 6.0

Nov 16

UIE44

TTE/12

Scope / Remarks IEC numbers corrected & minor changes made Reformatted & minor changes made

Minor changes made in sec.2.2.1 &2.5.3. Reformatted & minor changes made

iv Related Business Processes Code

Business Process (EPBM 4.0)

v Related Corporate Management Frame Work (CMF) Documents The related CMF Documents can be retrieved from the Corporate Business Control Documentation Register CMF.

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Specification for Electrical Installation Practice

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TABLE OF CONTENTS ii

Document Authorisation ................................................................................................. 3

iii

Revision History ............................................................................................................. 4

iv

Related Business Processes ......................................................................................... 4

v

Related Corporate Management Frame Work (CMF) Documents ................................ 4

1

INTRODUCTION ............................................................................................................ 9 1.1

PURPOSE .................................................................................................................................... 9

1.2

APPLICABLE STANDARDS, SPECIFICATIONS AND CODES .................................................. 9

1.2.1

PDO Standards .......................................................................................................... 9

1.2.2

Reference SIOP/SIEP Standards .............................................................................. 9

1.2.3

International Standards ............................................................................................ 10

1.3

COMPLIANCE WITH STANDARDS .......................................................................................... 10

SCOPE ......................................................................................................................... 11

2 2.1

Safety Regulation ....................................................................................................................... 11

2.2

Site Preparation .......................................................................................................................... 11

2.3

Fabrication and Fixing to Structural Steelwork ........................................................................... 11

2.4

Equipment Mounting................................................................................................................... 11

2.5

Equipment Identification ............................................................................................................. 12

2.6

Surface Cleaning and Protection ................................................................................................ 12

2.7

As Built Drawings and Documentation ....................................................................................... 12

2.7.1

General .................................................................................................................... 12

2.7.2

Circuit Charts ........................................................................................................... 12

CABLE INSTALLATION.............................................................................................. 13

3 3.1

General ....................................................................................................................................... 13

3.1.1

Requirements for Cable jointers............................................................................... 13

3.1.2

Jointing and Termination Kits and Tools .................................................................. 13

3.1.3

Covers and Cable Entries ........................................................................................ 13

3.1.4

Handling of Cables ................................................................................................... 14

3.1.5

Cable Pulling ............................................................................................................ 14

3.1.6

Cable Bending.......................................................................................................... 14

3.1.7

Cable Jointing .......................................................................................................... 14

3.1.8

Protection from Moisture .......................................................................................... 14

3.1.9

Cable Termination .................................................................................................... 14

3.1.10

Glands, Seals and Shrouds ..................................................................................... 15

3.1.11

Terminal Connecting Lugs ....................................................................................... 15

3.1.12

Sealing of Cable Transits ......................................................................................... 16

3.1.13

Cable Identification................................................................................................... 16

3.1.14

Core Identification .................................................................................................... 16

3.1.15

Single-Core Cables .................................................................................................. 18

3.1.16

Cable Supports ........................................................................................................ 18

3.2 Page 5

Underground Cables .................................................................................................................. 19 Specification for Electrical Installation Practice

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3.2.1

General Requirements ............................................................................................. 19

3.2.2

Cable Installation...................................................................................................... 19

3.3

Above Ground Cables ................................................................................................................ 20

3.3.1 3.4

General Requirements ............................................................................................. 20

Trunking...................................................................................................................................... 21

3.4.1

General .................................................................................................................... 21

3.4.2

Connections ............................................................................................................. 21

3.4.3

Brackets and Supports ............................................................................................. 22

3.4.4

Cover-Plates ............................................................................................................ 22

3.4.5

Attachment ............................................................................................................... 22

3.4.6

Fire Barriers ............................................................................................................. 22

3.4.7

Electrical Continuity.................................................................................................. 22

3.5

Conduit ....................................................................................................................................... 23

3.5.1

PVC Conduit ............................................................................................................ 23

3.5.2

Galvanised Steel Conduit......................................................................................... 23

3.5.3

Installation ................................................................................................................ 23

4

EARTHING SYSTEM ................................................................................................... 25 4.1

General ....................................................................................................................................... 25

4.2

Earth Electrodes ......................................................................................................................... 25

4.3

Earth Cables and Connections ................................................................................................... 25

4.4

Electrical Equipment ................................................................................................................... 26

4.5

Non-Electrical Equipment ........................................................................................................... 26

4.6

Bonding ...................................................................................................................................... 26

5

Hazardous Area ........................................................................................................... 27 5.1

General ....................................................................................................................................... 27

5.2

Zone Installations ....................................................................................................................... 27

5.2.1

Zone 0 Installations .................................................................................................. 27

5.2.2

Zone 1 Installations .................................................................................................. 27

5.2.3

Zone 2 Installations .................................................................................................. 28

5.3

Equipment Selection ................................................................................................................... 28

5.3.1

Gas Group................................................................................................................ 28

5.3.2

Temperature Class................................................................................................... 28

5.3.3

Ambient Specification............................................................................................... 28

6

Equipment Installation .................................................................................................. 29 6.1

Switchgear .................................................................................................................................. 29

6.1.1

General Requirements ............................................................................................. 29

6.1.2

Foundations and Positions ....................................................................................... 29

6.1.3

Installation ................................................................................................................ 29

6.1.4

Earthing and Bonding............................................................................................... 30

6.1.5

Instruments and Relays ........................................................................................... 30

6.1.6

Wiring ....................................................................................................................... 30

6.1.7

Electrical / Instruments Interface Boxes ................................................................... 30

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Transformers .............................................................................................................................. 31

6.2.1

General Requirements ............................................................................................. 31

6.2.2

Power Transformer Connections ............................................................................. 31

6.2.3

Connections for Specific Purpose Transformers ..................................................... 31

6.2.4

Earthing and Bonding .............................................................................................. 31

6.3

Batteries and Battery Rectifier .................................................................................................... 31

6.3.1

General Requirements ............................................................................................. 31

6.3.2

Battery Installation and Battery Rooms .................................................................... 32

6.3.3

Safety ....................................................................................................................... 32

6.3.4

Foundations and Positioning .................................................................................... 32

6.3.5

Panels and Racks .................................................................................................... 32

6.3.6

Loose Equipment ..................................................................................................... 32

6.3.7

Batteries ................................................................................................................... 32

6.3.8

Filling and Charging ................................................................................................. 33

6.3.9

Alarms ...................................................................................................................... 33

6.3.10

Labels....................................................................................................................... 33

6.3.11

Earthing and Bonding .............................................................................................. 33

6.4

Electric Motors ............................................................................................................................ 34

6.4.1

Installation ................................................................................................................ 34

6.4.2

Alignment ................................................................................................................. 34

6.4.3

Cable Connections ................................................................................................... 34

6.4.4

Earthing .................................................................................................................... 34

6.5

Lighting ....................................................................................................................................... 34

6.5.1

General Requirements ............................................................................................. 34

6.5.2

Foundations and Positioning .................................................................................... 34

6.5.3

Installation and Erection ........................................................................................... 34

6.5.4

Wiring ....................................................................................................................... 35

6.5.5

Connections ............................................................................................................. 35

6.5.6

Earthing and Bonding .............................................................................................. 35

6.6

Small Power ............................................................................................................................... 35

6.6.1

General Requirements ............................................................................................. 35

6.6.2

Installation ................................................................................................................ 35

6.6.3

Connections and Terminations ................................................................................ 35

6.6.4

Earthing and Bonding .............................................................................................. 35

6.7

Distribution Boards ..................................................................................................................... 36

6.7.1

General Requirements ............................................................................................. 36

6.7.2

Fixings and Positioning ............................................................................................ 36

6.7.3

Installation ................................................................................................................ 36

6.7.4

Main Cable Connection ............................................................................................ 36

6.7.5

Earthing and Bonding .............................................................................................. 36

7

APPENDICES .............................................................................................................. 37

8

APPENDICES .............................................................................................................. 41

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Appendix 1, Glossary of Definitions, Terms and Abbreviations.................................................. 41

Specification for Electrical Installation Practice

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1 INTRODUCTION 1.1

PURPOSE

This specification describes the installation practice and standards to be followed for all electrical equipment installeion works in PDO. Installation of electrical equipment shall be governed by, but not limited to, the provisions specified in this SP, and shall be undertaken to high standards of workmanship and in a safe manner. Contractors or any person executing PDO electrical works shall strictly follow the provisions of this Specification. This Specification shall be utilised with one or more of the referenced SPs and international standards to complete the PDO requirement for installation works.

1.2

APPLICABLE STANDARDS, SPECIFICATIONS AND CODES

The following Standards, specifications and codes should be consulted when applying the requirement of this Specification. All listed documents shall be latest issue except those documents prescribed by date.

1.2.1

PDO Standards

This SP contains references to the following PDO Standards: SP-1103

1.2.2

Page 9

- Electrical Engineering Guidelines (Amendment/Supplement to DEP-33.64.10.10)

SP-1131

Plant Lifecycle Information PlanERD-00-06 Preparation & Content of Engineering Drawings.

-

SP-1279

-

Civil & Building Construction Specifications.

SP-1285

-

Heating, Ventilation & Airconditioning ( HVAC) Specification

SP-1282

-

Guide to Concrete.

SP-1173

-

Welding of Metals

SP-1246 Production Facilities

Specification for Painting &coating of Oil and Gas

SP-1103

-

Electrical Engineering Guidelines (Amendment/Supplement to DEP 33.64.10.10.)

PR-1947

-

Electrical Safety Rules.

SP-1105

-

Electrical Standard Drawings.

SP-1106

-

Specification for Coding & Identification of Overhead Line Systems.

SP-1109

-

Specification for Earthing and Bonding.

SP-1111

-

Specification for Temporary Electrical Supplies for Constr. & Maint. Work.????

Reference SIOP/SIEP Standards

DEP 33.64.10.10-Gen

-

Electrical Engineering Guidelines.

DEP 34.11.00.11-Gen

-

Site Preparation and Earthworks.

DEP 34.28.00.31-Gen

-

Steel Structures.

Specification for Electrical Installation Practice

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Petroleum Development Oman LLC DEP 63.10.08.11-Gen

-

Field Insp. of Elect. Installation and Equipment.

DEP 70.10.80.11-Gen - Cleaning of Equipment

1.2.3

1.3

International Standards

ERA Report 69-30

-

Current rating standards for distribution cables.

IEC 60079

-

Electrical Apparatus for Explosive Gas Atmospheres.

IEC 60614

-

Specification for Conduits for Electrical Installations.

IEC 60981

-

Extra Heavy Duty Rigid Steel Conduits for Electrical Installations.

IEC 61035

-

Specification Installations.

BS 1363

-

Specification for 13A Fused Plugs and Switched and Unswitched Socket-Outlets.

BS-4568 Part 1

-

Steel Conduits, Bends and Couplers.

BS-4607 Part 1

-

Rigid PVC Conduits and Conduit Fittings Metric Units.

BS 4662

-

Specification for Boxes for the Enclosure of Electrical Accessories.

BS 4678

-

Cable Trunking.

BS CP 413

-

Code of Practice for Ducts for Building Services.

IEE

-

Regulations for Electrical Installation.

IP

-

Model Code of safe Practice - Electrical, Part 1.

for

Conduit

Fittings

for

Electrical

COMPLIANCE WITH STANDARDS

All requirements of this Specification shall apply as minimum requirements; where equipment manufacturer’s standards are more stringent the latter shall apply. The user shall obtain the written approval from E-CFDH or delegated for any deviation from this Specification. In all cases, the Company shall determine the adequacy of Works executed by the Contractor in accordance with this Specification.

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2 SCOPE 2.1

Safety Regulation

The installations of electrical equipment shall comply in all respects with the latest issue of PR1947 'PDO Electrical Safety Rules'. It is the duty of all persons involved in installation of electrical equipment to conduct their work in accordance with the relevant statutory regulations of the Sultanate of Oman and the PDO Electrical Safety Rules.

2.2

Site Preparation

The general requirements for the preparation of installation sites are given by DEP 34.11.00.11-Gen., Site preparation and earthworks If an electrical installation work requires completion by other trades in order to complete the work, sufficient notice shall be given to The Company Representative.

2.3

Fabrication and Fixing to Structural Steelwork

Structural steelworks shall not be drilled, unless specifically indicated on construction drawings. Fabrication of steelworks shall be in accordance with DEP 34.28.00.31., Steel structures

2.4

Equipment Mounting

Equipment, mounting plates and brackets for positioning of switchboards shall be supplied to correct sizes and standards. Equipment shall be mounted so that it is readily accessible for both inspection and maintenance. Mounting plates and brackets shall be free of burrs and sharp edges. Fixing and guide holes shall be drilled or machined; flame cutting shall not be permitted. Independently mounted equipment shall be positioned as shown on approved layout drawings. Mounting of equipment and/or accessories on, or saddling cables to, building cladding, shall not be permitted. Mounting plates, brackets, etc., shall have sufficient space allowance for equipment identification. Brackets and supports shall be constructed so that induced vibration from wind, or operation of surrounding equipment, etc., shall not cause any defects. Correct size of bolts, screws etc. shall be used for mounting and fixing. Explosive or impact-powered tools shall not be used for affixing mounting studs. All equipment and panels, etc., shall be adequately supported at all times. The scope of supply shall include all screws, bolts, supports brackets, spacers, etc., which may be required for the proper and effective fixing of any materials and equipment included in the scope of the construction Works. Approved types of fixings are:Brickwork and Block-works Timber

: :

Raw-plugs, fibre and plastic types. Wood screws.

Site-assembled electrical equipment such as distribution boards, control panels etc., shall be installed to the correct level and alignment. Page 11

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All sections shall be correctly assembled and interconnected, and no gaps shall be left between mating components.

2.5

Equipment Identification

Electrical equipment, cables and wiring shall be identified in accordance with the detailed design drawings. Nameplates, with the exception of switchboard identification, shall be fixed adjacent to, and not on, particular items of equipment. All wording shall be horizontal. Nameplates shall be fixed with plated (or approved corrosion-resistant) screws; self-adhesive or glue-on nameplates shall not be permitted. Unless specified otherwise, lettering shall be black on a white background and shall be in upper case letters.

2.6

Surface Cleaning and Protection

Cleaning of equipment shall be in accordance with DEP 70.10.80.11-Gen.,Cleaning of equipment. Surface protection of equipment shall be in accordance with SP-1248.

2.7

As Built Drawings and Documentation

2.7.1

General

Provision of 'As-Built' drawings shall be in accordance with SP-1131and ERD-00-06. 2.7.2

Circuit Charts

Distribution boards shall be fitted with distribution circuit charts installed inside each distribution board. These charts shall consist of a typed list giving both designation of each circuit and rating of each circuit fuse or circuit breaker. Labels shall also be attached to all barriers of fuses or circuit breakers, indicating identification number of each individual circuit shown on distribution circuit chart. All spare ways shall be left blank on each distribution circuit chart.

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3 CABLE INSTALLATION 3.1

General

3.1.1

Requirements for Cable jointers

All cable jointing & termination shall be executed by fully trained tradesmen, who hold a valid certificate issued by a Company approved Vendor. The certificate shall not be older than 6 months at the start of work and be valid for the cable operating voltage level concerned. All cable jointers shall possess a valid jointers certificate signed and issued by the CFDH, Electrical. The certificate shall be issued after successful assessment by a panel consisting of trained personnel. The panel shall be formed by CFDH-E, after successful completion of training by product vendors. 3.1.2

Jointing and Termination Kits and Tools

Only kits of approved suppliers, received sealed, shall be used. The kits shall be complete with all original vendor supplied materials including ferrules for jointing. It is not allowed to use substitute ferrules or other jointing or termination materials, not forming part of the original kit. Cable lugs for termination shall be of approved types. Cable jointing/termination shall be made strictly following instructions supplied with the kits. Every critical stages of jointing, such as cable prepared cable prior to insertion of sleeves, stress tube installation, cable lug installation, heat shrinking and testing. For every new joint or termination a new complete sealed kit shall be used. It is not permissible to either use left-over materials from other joints, or use materials from different suppliers to complete a kit without written permission from the Company Representative responsible for the work. Tape for colour coding of phases (red, yellow, blue) shall be of the kit makers meant for the purpose. No ordinary PVC insulating tape shall be used. For each joint or termination a proper record shall be kept indicating as a minimum date, location, make of utilised materials and the jointers name. This information shall also be embossed on a plain lead sheath and fixed at the joint / termination point. Each jointer shall have his own Toolkit, complete with tools as listed in Appendix 1.

3.1.3

Covers and Cable Entries

Particular attention is drawn to the safeguarding equipment installed in outdoor locations and unfinished buildings. Such equipment is particularly vulnerable to damage from water and dust penetration. Equipment shall be adequately protected in this respect while installation work is proceeding. Covers temporarily removed from equipment for purposes of installation shall be reassembled on completion of the Work and replaced when such Work is suspended or otherwise left incomplete. Similarly, all entries shall at all times be effectively sealed against ingress of water and dust, e.g., conduit entries shall be sealed by the insertion of proprietary stopper plugs.

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Handling of Cables

Storage and handling of cable before and during installation shall be executed with regard to Manufacturer's recommendations. Cable drums shall be rotated only in the direction indicated on the drum, and open ends of cable shall be effectively sealed after cutting to prevent ingress of moisture, in accordance with Section 3.8. 3.1.5

Cable Pulling

Armoured cables shall be installed with the aid of specifically-manufactured rollers, in order to prevent damage to cables. Cables up to 38 mm diameter shall be installed by hand. Larger diameter cables may be installed with the assistance of a winch, subject to approval by the Company Representative. Any such winch shall be equipped with a suitable, calibrated tensioning device and indicator, and operated by a competent operator. Cable shall never be installed directly from a drum mounted on a moving vehicle. Drum jacks, cable rollers and other equipment shall be of the correct type for the cable being installed. 3.1.6

Cable Bending

At all times utmost care shall be exercised to prevent excessive bending or twisting of cable during installation. Changes in direction in cable trenches, racks or trays shall provide for a minimum cable bending radius in accordance with the manufacturer’s recommendations. In the absence of manufacturer’s written recommendations DEP 33.64.10.10-Gen, Electrical engineering guidelines, shall be followed. 3.1.7

Cable Jointing

Cables shall be run in continuous unbroken lengths. Any requirement for cable jointing shall be executed only with the approval of the Company Representative. 3.1.8

Protection from Moisture

Each wiring system shall be installed either where it will not be exposed to rain, dripping water, steam, condensed water, etc., or be of a type designed to withstand such exposure. In damp situations and wherever they are exposed to weather, all metal sheaths and armour of cables, metal conduit, ducts, ducting trunking clips and their fixings, shall be of corrosionresistant material of finish, and shall not be placed in contact with other metal with which they are liable to generate electrolytic action. Exposed conductor and insulation at termination and cable joints shall be protected during installation from ingress of moisture by sealing suitably. For spare cables installed and cables returned to Company stores the open ends shall be properly sealed with heat shrinkable or other approved type sealing caps to protect against the ingress of moisture and water. 3.1.9

Cable Termination

Within motor terminal boxes, an adequate length of cable tail shall be provided to enable each cable core to be connected to any terminal, in accordance with the approved method of termination for each motor. All cores of multicore cables shall be terminated including any spare cores.

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For multicore terminal/junction boxes, an adequate length of cable tail shall be left to allow for remaking and termination of each core, i.e., a 25 mm diameter loop prior to entry of cable core into each terminal. All cores of multicore cables shall be terminated including any spare ones. All connections at a cable termination shall be mechanically and electrically sound and shall be protected against mechanical damage or any vibration liable to occur. They shall not impose any appreciable mechanical strain on fixing of the connection and shall not cause any harmful mechanical damage to the cable conductor or equipment. Conductors of cables shall be terminated in a manner suitable for the terminal arrangement of the equipment concerned. For HV cable termination the skirts on the phase cores shall be installed in such a manner that they do not touch each other phases. When terminating cables on bushings care shall be taken not to have any strain on the bushing by the weight of the cable and by expansion/contraction of cables due to temperature variations. The appropriate check sheets shall be completed by the Contractor and accepted by the Company Representative, prior to final connection.

3.1.10

Glands, Seals and Shrouds

The entire body of a cable shall enter a gland, and the outer shrouds of a cable shall not be removed before entering the weatherproof seal. Cable shall be on a straight axis from a point immediately before entering a gland. Cable glands shall securely retain the cable without damage to the outer sheath or armour. Shrouds shall be installed over the glands only after the cable/gland installation is inspected by the company site representative. Glands shall be of approved type, correctly sized and of a type suitable for installation in each respective type of enclosures. All glands shall be correctly sized and of a type which will maintain the integrity of the equipment within into which they are to be installed. Such factors as use of insulated plastic enclosures and explosion proof type protection shall be taken into account when selecting glands. Cable glands shall be of double compression type for all armoured cables. All mechanical glands shall be of the hexagon type; knurled type glands shall not be used. Earth continuity of brass glands and termination shall be achieved by rigid clamping of armour within each gland and intimate contact between threaded components of glands and equipment. Brass glands terminating in unthreaded enclosures shall be provided with earth continuity by attachment of earth continuity bonds. Cores of sheathed cables, from which the sheath has been removed, and non-sheathed cables at termination of conduit, ducting or trunking, shall be enclosed according to the design specification. All cable gland mounting plates for single-core cables shall be of non-magnetic material.

3.1.11

Terminal Connecting Lugs

Cable tails of conductors of 10 mm2 and above shall be fitted with compression-type terminal connection lugs, using tools specially designed for use with such lugs. At all terminal connections, cable conductors shall be fitted with correctly sized cable sockets of the crimped compression type. All wires of a conductor shall be securely retained. Soldered connections shall be employed only where their use is unavoidable and written approval for the same is obtained from the company representative. In such cases the solder used shall have a melting

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point of not less than 1850C, and cable, lugs or thimbles shall be the correct type and size for each conductor. Packing of oversized lugs shall not be permitted. Compression joints shall be made using proprietary sets of lugs and indent dies, correctly sized and shaped for each specific conductor concerned. Use of mixed lugs and dies of different manufacture or systems shall not be permitted. Refer approved vendors list for ferrules and cable lugs. 3.1.12

Sealing of Cable Transits

Openings made or provided in or through building walls, floors, etc., shall be effectively sealed. MCTs (Multi Cable Transits ) shall be provided when cables enter a hazardous area from a safe area or transit between two hazardous areas. Cable entries into trenches (in switchrooms, etc.). shall be effectively sealed after cables have been laid. Unused cable entries and cable entries in equipment also shall be effectively sealed. Openings through roofs and external walls shall be made weatherproof, including installation of flashing and/or rain-hoods to prevent the entry of water, dust, etc. 3.1.13

Cable Identification

Cable identification shall be strictly in accordance with the following colour code for the outer sheath.

CABLE

COLOUR CODE

LV multicore LV single core

Black or grey Black or grey

HV multicore HV single cores

Red Red

The outer sheath of cables shall not be painted under any circumstances 3.1.14

Core Identification

Core marking shall be strictly in accordance with the following colour code STD-00-000000-EA2580-90119-0001 CABLE

COLOUR CODE

Two core

Red - Black (Phase - Neutral)1

Three core

Red - Yellow - Blue (Phase colours)

Four core

Red - Yellow - Blue - Black (Black: Neutral)

Note 1: For two core cables, the colour code is not mentioned in STD drawing. Where cable supplied to the Contractor bears a different conductor colour code, the Contractor shall install either sleeves or tapes of the appropriate correct colours to the individual cores at both termination points.

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For multicore cables having more than four cores, core identification shall be by means of numbered cores. Each single core non-flexible cable shall have either sleeves or tape fitted of the appropriate colours, as described above, at both termination points. All protective (including earthing) conductors shall be identified by the colours Green and Yellow. Colour identification of cores of flexible cables and flexible cords shall be in accordance with Table 52B of the IEE Regulations.

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Table 52B - Colour Identification of Cores of Flexible Cables and Flexible Cords. NUMBER OF CORES

FUNCTION

COLOUR

1

Phase Neutral Protective

Brown (1) Blue Green-and-yellow

2

Phase Neutral

Brown Blue (2)

3

Phase Neutral Protective

Brown (1) Blue (2) Green-and-yellow

4 or 5

Phase Neutral Protective

Brown or black (4) Blue (2) Green-and-yellow

Check the table with the update SP-1103 (1) Or any other colour not prohibited by IEE Regulations 524-1 and 524-5, except blue. (2) Blue core may be used for functions other than the neutral in circuits which do not incorporate a neutral conductor, in which case its function shall be appropriately identified during installation; provided that the blue core shall not in any event be used as a protective conductor. If the blue core is used for other functions, the coding L1, L2, L3, or other coding where appropriate should be used. (3) In three-core flexible cables or flexible cords not incorporating a green-andyellow core, a brown core and a black core may be used as phase conductors. (4) The core identification for fixed cables shall be used for 3 phase system coloured sleeves or tapes to be applied to the individual cores as described in fixed installation. 3.1.15

Single-Core Cables

Each set of single-core cables comprising a three-phase circuit shall be run close together in trefoil formation and secured by non magnetic clamps at intervals of one meter. When installed in ducts, each trefoil group shall be installed in a single duct. 3.1.16

Cable Supports

Every cable and conductor used as fixed wiring shall be supported in such a way that it is not exposed to undue mechanical strain and so that there is no appreciable mechanical strain on the termination of the conductor. Account shall be taken of the mechanical strain imposed by the supported mass of the cable or conductor. Conduit, ducting and trunking shall be properly supported and of a type that is either suitable for any risk of mechanical damage which may be met in normal conditions of service, or adequately protected against such damage. Installations shall take into account longitudinal expansion and contraction that may occur with variation of temperature under normal operating conditions.

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Petroleum Development Oman LLC 3.2

Revision:6.0 Effective: Nov. 2016

Underground Cables

3.2.1

General Requirements

All excavation, cable protection, backfill and surface restoration and installation of cable markers, protection tiles and warning tape shall be in accordance with the Electrical Standard drawing. Construction of cable trenches, their bedding and back filling shall be executed in accordance with the relevant drawings listed under STD 4 0101 001 in SP-1105 'Electrical Standard Drawing'.( updated drawing no. STD-00-000000-EA-4180-90101-0001) Where excavations are required near footings, foundations, concrete floors, etc., earthworks under and in the vicinity of these excavations shall not be disturbed and all backfill shall be well consolidated. Installation shall be so arranged that all trenches are excavated and back-filled in a minimum period of time. When planning the excavation sequence for cable trenches, the Contractor shall take care to not obstruct access. Adequate safety precautions shall be observed at all excavations by the provision of safety barriers, warning notices, shoring etc. Cables installed under roads shall be in accordance with the Electrical Standard Drawing, STD 4 0103 001. An additional number of pipes, 3 to 5, depending on space, shall be installed at normal cable laying depth to accommodate future cables. Cables to be installed in underground ducts, conduits or pipes, shall be of a type that incorporates a sheath and/or armour, suitably resistant to any mechanical damage likely to be caused during drawing in. Physical separation between HV, LV, telecommunication and instrument cables laid within the same cable trench shall be in accordance with Standard Electrical Drawings. Underground cable routes shall avoid close proximity to pipe crossings and parallel pipe runs. Physical separation between cables and pipes shall be not less than 300 mm and cables should cross underneath pipes. If a cable route is in close proximity to underground pipes carrying hot liquids or gases, or which are regularly steam cleaned, the pipe shall be insulated in order to limit its outside temperature to a maximum of 60oC. In these cases cables may be run above pipes. Buried cables shall be identified with their full cable numbers, as detailed on the cable schedule, at both termination points, at every change in direction and at 5 metre intervals along their route length. Cable number shall be embossed on a plain lead strip and installed in accordance with the Standard Electrical Drawings. Cable route and cable joint markers shall be installed visibly at ground surface level in accordance with the Standard Electrical drawings. When cable routing is not definitely indicated on a design layout drawing, full details of the proposed routing shall be submitted to the Company Representative for approval. Routing details shall be shown clearly on the working drawings. 3.2.2

Cable Installation

Installation of direct buried cables shall not be commenced until the entire route has been excavated and prepared ready to receive the cable. Spare length of (min.10 mtr.) HV cable, sufficient for re-termination shall be provided in 'S' loop at each end. If cable is left exposed above ground, it shall be coiled and suitably protected against damage. Alternatively, such cable may be left on the drum which shall be lowered from its jacks and firmly anchored. Page 19

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Petroleum Development Oman LLC Laying patterns, as indicated on the layout drawings, shall be adhered to.

Unavoidable crossings shall be made either in the cable cellar directly underneath the corresponding switchgear panel, or at the branching-off point of a particular cable from the main trench. Care shall be exercised to keep the whole installation tidy in these areas. Ends of hard-floored cable trenches, ducts or pipes shall slope down into surrounding soil, to avoid cable damage following possible settling of soil.

3.3

Above Ground Cables

3.3.1

General Requirements

Cable shall be laid on racks or trays in accordance with laying patterns indicated on layout drawings. All cable outlets from a duct system, all joints in a duct system, and all joints between such a system and another type of ducting or conduit shall be formed so that joints are mechanically sound. Cables shall not be damaged during cable pulling. Spacing between cable racks, trays, or cable ladders, and structures, wall or columns, shall be at least 50 mm. Metal parts of cable racks and trays shall be bonded between each section, and connected to the common earth grid. Cables shall be fixed to cable racks and trays by proprietary ties, straps and / or clamps where indicated on the layout drawings and as specified in the design specification. The cable ties, straps and clamps shall be capable of retaining the cables during short circuit stresses, and if nylon / plastic ties are used they shall be UV-resistant. Cable ties, straps or clamps shall be provided at every point where there is a change in direction and at following intervals: Cable OD (mm)

Horizontal run of cable

Vertical run of cable

<15 mm

350 mm

450 mm

15 to 40 mm

450 mm

600 mm

40 to 60 mm

700 mm

900 mm

>60 mm

1100 mm

1300 mm

Where cables, conduits, ducts or trunking pass through fire-resistant structural elements such as walls and floors designated as fire barriers, openings made shall be sealed according to the appropriate degree of fire resistance. In addition, where cables, conduits or conductors are installed in channels, ducts, trunking, or shafts that pass through such elements, suitable internal fire-resistant barriers shall be provided to prevent spread of fire. Exposed lengths of flexible cable or flexible cord used for final connections to fixed equipment shall be as short as possible. They shall be connected to fixed wiring by a suitable accessory or enclosure or by suitable device(s) for overcurrent / earth leakage protection, for isolation and switching to ensure personnel safety. Enclosures for conductors and their joints / termination which are subjected to dust conditions shall be protected to IP 54 (refer to IEC 60529). Cables shall not be installed on exterior wall faces of buildings, ceilings or support structures. Spacing between cable and structure or similar shall be at least 50 mm.

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For horizontal runs of cable on structures, cables shall be adequately cleated such that no sags occur in cabling. All cables shall be supported by saddles, cleats or other supports as indicated on the layout drawing such that no mechanical forces are imposed on cable glands. Cable saddles shall be double fixing. Half-section saddles shall not be used. Fixing of saddles by means of explosive tools shall not be permitted. Cleats shall firmly clamp cable without distorting or damaging cable. Cables sheathed with rubber, PVC or equal, may be supported by a catenary wire, either continuously bound to supported cable or attached at intervals. For cables supported by a catenary wire incorporated in the cable during manufacture, spacing between supports shall not exceed those stated by the Manufacturer, and shall be installed in accordance with minimum heights indicated on the layout drawings. For spans without intermediate supports, terminal supports shall be arranged so that undue strain is not placed on conductors or insulation of cable. Adequate precautions shall be taken against any risk of chafing of cable sheath. Minimum specified height above ground and length of spans shall be in accordance with the layout drawings.

3.4

Trunking

3.4.1

General

In addition to PVC trunking which may be indicated on drawings, metal trunking may be used instead of multiple conduit runs. Trunking shall be constructed from 1.2 mm thick galvanised sheet steel for sizes up to 100 mm and 1.6 mm thick sheet steel for larger sizes. All cable trunking shall be galvanised unless otherwise specified. Trunking shall be turned-in to form a lip at both edges and shall be supplied in standard lengths of 2 or 3 metres. All cable trunking and accessories shall conform to BS 4678. Wherever possible all bends, tees, intersection and other accessories shall be fabricated and finished by the trunking manufacturer. Accessories shall be of similar construction and finish to the main trunking. Due allowance shall be made in long runs of trunking for expansion and contraction of supporting structure. Suitable flexible couplings shall be provided in all instances where trunking crosses expansion joints in building structure. Bends, tees and intersections shall be of the gusset type. When trunking is cut, filed or drilled, connections shall be given one coat of primer paint and one finishing coat to match the trunking finish in accordance with SP-1246. Care shall be taken to ensure that all steel and brass particles, etc., are removed from trunking prior to installation of cables. Cable joints shall not be permitted in trunking. Intersections which have holes cut in the base of trunking to permit passage of cables shall have protective PVC beading round hole edges. Internal free area of trunking shall be such that the quantity of cables contained shall occupy not more than 45% of available space. 3.4.2

Connections

Trunking lengths shall be connected by internally-fixed rectangular coupling units. Coupling units shall be of sufficient width to provide a maximum of bearing face of 25 mm on each section of trunking to be joined. However, where long spans occur between supports, the couplings shall be of sufficient length and rigidity to prevent any sagging. The lengths of the lids shall be so arranged that joints always coincide with the centres of coupling units.

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Revision:6.0 Effective: Nov. 2016

Brackets and Supports

Trunking shall be supported by substantial brackets spaced in accordance with table 11D of the 16th Edition of the IEE Regulations for Electrical Installation. Additional supports shall be provided at bends and intersections. Brackets shall be painted prior to installation to prevent corrosion. 3.4.4

Cover-Plates

Cable trunking shall be fitted with drip-proof close-fitting lids or cover-plates, securely fixed to trunking by approved means that avoid damage to the cables contained. Trunking runs shall be so arranged that lids or cover-plates always are on the top or side (not underneath), unless otherwise specified. Where trunking faces downwards or sideways, cableretaining straps shall be fitted at intervals of not more than 900 mm. Cover-plates shall be secured by plated (or corrosion resistant) screws and fixed nuts. Covers held by 'self-tapping' screws or spring tension shall not be permitted.

3.4.5

Attachment

Trunking shall be firmly attached to respective equipment by either bolted flanges or hexagonal male bushes with couplers or lock-nuts, accordance to the requirements for equipment concerned. Where trunking does not terminate in equipment, open ends shall be capped with suitable flanged covers bolted in position. Trunking that is intended for the accommodation of cables for different services shall be divided into separate compartments to provide complete cable segregation.

3.4.6

Fire Barriers

Where trunking passes through walls and/or floors that normally constitute fire barriers in buildings, no gaps shall be left between trunking and building structure through which fire might spread. Also a suitable barrier of incombustible material shall be provided and fitted inside trunking to prevent the passage of internal fire. 3.4.7

Electrical Continuity

All metal trunking shall be electrically and mechanically continuous throughout. Copper bonding straps to provide electrical continuity shall be fitted at each joint between lengths of trunking, bends, tees and intersections and any other accessories or equipment to which the trunking is connected. Electrical continuity of any complete metal trunking system from end to end and from any point on a system to its main earth connection shall not exceed a resistance value of 1 ohm. Trunking systems shall not be used as an earth conductor.

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Petroleum Development Oman LLC 3.5

Revision:6.0 Effective: Nov. 2016

Conduit

3.5.1

PVC Conduit

PVC Conduit shall be installed only inside buildings and shall be heavy gauge Type A, high impact, smooth inside and outside, in accordance with BS 4607 Pt 1. All joints between PVC conduit and accessories shall be glued by a solvent welding process in accordance with the Manufacturer's instructions. Minimum size of conduit shall be 20 mm in diameter. Every final sub-circuit installed in PVC conduit shall be earthed by means of separate PVC insulated (green/yellow) single core earth conductor, drawn into the conduit and connected to earth terminals of all fittings and Where PVC conduit is to be terminated at a BS 1363 or BS 4662 rectangular wiring accessory box, termination shall be made by means of couplers and bushings. Couplers shall have one end solvent welded to the PVC conduit, the other end shall be threaded internally to receive a male bush, which is to secure the coupler to the box concerned. PVC conduit shall be protected from weather and all mechanical damage during installations or while stored at Site. 3.5.2

Galvanised Steel Conduit

Only galvanised conduit shall be used for external work. Conduit of not less than 20 mm diameter shall be of heavy-gauge welded and screwed pattern to BS 4568, Part 1, unless otherwise specified. In all instances where galvanised steel conduit is used, accessories and fixing clips, etc., also shall be galvanised. The whole of the conduit system shall be weatherproof and a suitable compound shall be applied to all threaded joints to prevent ingress of moisture.. This compound shall be such that it will not impair the electrical continuity of a conduit system. Termination to accessory boxes shall be by smooth bore brass bushings and couplings with compression washers between couplings and boxes. 3.5.3

Installation

All conduit shall be installed neatly and as unobtrusively as possible, parallel to general building lines when run on surface of walls and ceilings. Routes for all trunking and conduits shall be arranged to avoid traps or low level pockets. All routes shall be co-ordinated with all other trades prior to commencement of installation in any particular area. Wherever possible, conduit runs shall be concealed in ceilings, walls, chases etc. Wherever the system of wiring is concealed, looping shall be done in the junction boxes and not at the luminaries or appliance. Recessed conduits buried in concrete shall have a minimum of 5mm concrete cover over them. In no circumstances shall conduit boxes be installed where access cannot be obtained following completion of the building. On straight conduit routes, draw-in boxes shall be fitted at not more than 10 metre intervals, but where conduits are run from point to point with not more than two right-angle bends, drawin boxes shall be provided at intervals of not more than 8 metres. Bends in steel and PVC conduits shall be made on a pipe bending machine fitted with former of the correct radii for the particular conduit. Conduits shall be cleaned and free from swarf and oil prior to installation. Page 23

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Surface mounted conduits shall be secured in accordance with the latest edition of IEE Wiring Regulations. 'Distance' saddles shall be used on individual runs such as down drops to switches and socket outlet points. Cable, conduit runs, etc., crossing access ways, shall not project below the nominated height. The minimum height inside building shall be the height of the access doorway. Unused holes in junction boxes, trunking outlet boxes, switchgear, etc., shall be blanked-off by means of proprietary stopping plugs. Use of crimpets is restricted to the securing of conduits in wall chases or on structural floor slab pending plastering, screeding or other finishes. Steel conduit systems shall be electrically and mechanically continuous throughout. All conduits shall be provided with draw-in wires. Where galvanising on surface-mounted conduit has been damaged in the course of erection, it shall be made good with good quality aluminium paint. All exposed threads shall be similarly treated. Care shall be taken to prevent ingress of plaster and cement, etc., into conduits during progress of installation, and before any wiring is installed, all conduit shall be swabbed dry internally. This shall be ensured by 'pulling through' each section of an installation, prior to installation of cables. All conduit shall provide cable capacities in accordance with the IEE Regulations. No section of a conduit installation shall be concealed within the fabric of a building before it has been inspected by the Company Representative. Phase and neutral wires belonging to one circuit shall be drawn in the same conduit.

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4 EARTHING SYSTEM 4.1

General

Reference shall be made to SP-1109, Specification for Earthing and Bonding. Each installation shall have one common earth grid connected to at least two groups of earth electrodes. The earth grid shall extend throughout the installation in the form of a ring circuit with branch connections to the equipment and structures to be earthed.

4.2

Earth Electrodes

Extensible earth rods shall be installed in accordance with the Standard Electrical Drawings to a minimum depth of 4.8 metres. Actual earth electrode locations shall be in accordance with the approved installation earthing layout design drawing. The number of electrodes shall be increased if required to obtain the design value of earth resistance. In rocky areas, where the required earth resistance cannot be attained using the standard earth electrode configuration, application of deep well earth pits should be examined and a prior approval obtained in this regard from the Company representative.

4.3

Earth Cables and Connections

Earth system cables shall be of stranded copper PVC-covered type, of cross-section specified on the relevant design earth layout drawing. Colour of PVC sheath shall be green and yellow. Connections between earth electrodes and main ring earth conductors shall be executed in accordance with Standard Electrical Drawings and in such a way as to facilitate the inspection and testing the earth resistance of each individual earth electrode group without disconnection of the earth system main ring. All parts of earth cable conductors which are not insulated shall be suitably protected against direct contact with the soil to prevent electrolytic corrosion. This may be achieved by lap wrapping bared sections with green/yellow PVC adhesive tape. All earthing termination shall be made with compression type cable lugs. Interconnections shall be directly clamped with compression type branch connectors as detailed in Standard Electrical Drawings. The resistance between each earth electrode configuration and the general mass of earth shall not exceed 4 ohms when isolated from the main earth grid. Location of earth electrodes, earth conductors connections and earth cable routes shown on the installation earth layout drawing shall be considered as diagrammatic only, and site inspection shall be necessary to determine earth boss locations and conductor routes prior to installation. Within buildings, strips of high conductivity copper, sized in accordance with the layout earthing design drawing, can be utilised. Where copper tape or cable is fixed to building structure it shall be by means of purpose-made saddles. Fixing shall be made using purpose-made lugs and clamps. Fixing requiring drilling of holes through strips shall not be used. Where tape or cable is run in the ground or fixed externally, and is liable to corrosion, it shall be wrapped with corrosion-resistant material. Alternatively, PVC sheathed tape or cable may be used. Page 25

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Joints in copper tape shall be tinned before assembly, riveted with a minimum of two rivets, and sweated solid. Where holes are drilled in the earth tape for connection to items of equipment, effective crosssectional area of connection shall be not less than that required to comply with the IEE Wiring Regulations. Bolts, nuts and washers for any fixings of earth tape shall be of high-tensile grade.

4.4

Electrical Equipment

Metallic enclosures of all electrical equipment shall be earthed by connection to the common earth grid. Cross-sectional area of the equipment earth connections shall be in accordance with the earth layout design drawing and PDO Electrical Standard Drawings. All earth branch conductors installed outside buildings shall be stranded copper with a coloured green/yellow PVC sheath.

4.5

Non-Electrical Equipment

All metallic equipment used for storage, processing, transportation or pumping flammable liquids, vapours or gases, and their associated supporting structure or skid, shall be electrically bonded to the installation main earth ring in accordance with the Standard Electrical Drawings and IP Code, Part 1. Electrical bonding of associated metal work, in handrails, walkways, etc, is not necessary if it is demonstrated by testing that they are electrically continuous with the structure. Pipelines shall be connected to the installation main earth ring at a point at which the pipelines enter and leave the hazardous area on the installation side of all pipeline insulated couplings. Piping which is not in electrical contact with its associated tank or vessel, such as an open discharge line into a tank, shall be bonded to the tank. In installations that do not contain electrical equipment, the resistance between each earth electrode configuration and the general mass of earth shall not exceed 7 ohms when isolated from the main earth grid.

4.6

Bonding

Metal sheaths and armour of all cables operating at low voltage, metal conduits, ducting, trunking, and protective conductors associated with such cables, which might otherwise come into contact with adjacent fixed metalwork; shall be effectively either segregated from, or bonded to, adjacent metal work. Metallic sheaths and/or non-magnetic armour of all single-core cables in the same circuit shall be bonded together and earthed at both ends of their run (solid bonding) unless specified otherwise in the design specification. All interior metal, water and gas piping shall be bonded together and made electrically continuous. Non-conductive coatings (such as paint, lacquer and enamel) on equipment to be earthed shall be removed from threads and other contract surfaces to assure good electrical continuity.

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5 Hazardous Area 5.1

General

All electrical equipment being installed in hazardous areas shall be certified by an independent authority for use in accordance with the zonal classification (ref. IP code part 15) as detailed on the hazardous area design drawing (ref.SP-1127). Electrical apparatus of different types of protection shall comply with the relevant parts of IEC 60079. The procedures for classifying the installation into zones is known as 'area classification' as follows.

5.2

Zone 0

-

Flammable atmospheres are continuously present or present for long periods.

Zone 1

-

Flammable atmospheres are likely to occur in normal operation.

Zone 2

-

Flammable atmospheres are not likely to occur in normal operation and if they occur will only exist for a short time.

Zone Installations

5.2.1

Zone 0 Installations

Electrical equipment shall not be installed for use in Zone 0 areas.

5.2.2

Zone 1 Installations

All equipment installed shall be certified for use in Zone 1 area and comply with IEC 60079. Progressive inspection shall be made as the work proceeds. Inspection shall include:-

Cracks in metal.

-

Cracked or broken glasses.

-

Cement failure round glasses.

-

Effects of corrosion.

-

Damaged threads.

-

Slackness of joints in conduit runs and fittings.

-

Cable defects, e.g., clamping causing armour fracture.

-

Damaged weatherproof seals.

-

All locking and sealing devices.

-

Slackness of cable glands, reducers adapters and stopper plugs.

-

Insertion of all flange joint bolts and screws.

-

Cable armour earthing.

Obstructions near to flameproof joints shall be avoided. Flanged gaps shall not be sealed with insulating tape/or any other material. Electrical continuity between flameproof enclosures and the installation shall be ensured by the integrity of the joint. Connections by external bonding shall be directly across the joint. Flameproof installations shall be segregated from equipment or pipe work carrying inflammable liquids or gases. Special attention to bonding shall be effected where segregation is not possible. Page 27

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Where cables pass through floors and walls, holes provided shall be made good on completion using incombustible material to the full thickness of the floor or wall. i) Cables All electrical cables installed in a Zone 1 area shall have steel wire armouring or braiding (aluminium or copper wire for single core cables) and outer PVC sheath, and be in accordance with The Company's approved cable specification. All cable termination within the Zone 1 area shall be completed in certified terminal or junction boxes. Cable shall be adequately supported throughout their length on tray work. Supporting cables by clipping to process plant or pipe work shall not be allowed. The correct type of cable gland shall be used on all equipment to ensure the integrity of the explosion-proof protection (and validity of the corresponding certificate) is maintained. Where the use of gland adapters/reducers are necessary, only one certified adapter/reducer shall be installed per cable gland/entry. 5.2.3

Zone 2 Installations

All equipment installed shall be certified for use in a Zone 2 areas and comply with IEC 60079. Progressive inspection shall be made generally in accordance with Section 2.4.2.2. All electrical cables shall be armoured with an outer PVC sheath in accordance with the requirements of Section 2.4.2 part i.

5.3

Equipment Selection

5.3.1

Gas Group

The equipment used in hazardous areas shall be certified for the gas group applicable to the area as per the area classification drawings. All measures required to comply with this shall be adhered to during installation. 5.3.2

Temperature Class

The equipment used in hazardous areas shall be certified for the temperature class applicable to the area as per the area classification drawings. 5.3.3

Ambient Specification

The equipment used in hazardous areas shall be certified for the ambient specification applicable to the area.

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6 Equipment Installation 6.1

Switchgear

6.1.1

General Requirements

Environment within the switchrooms shall be kept to acceptable limits to allow equipment storage and installation to take place without damage. Under no circumstances shall any item of equipment be forced. Every fit will have been checked in the Manufacturer's work and if force is required the equipment shall be rechecked, realigned and the necessary corrective action taken until force is not required. Only the correct size and type of tools shall be used in the erection of switchgear. 6.1.2

Foundations and Positions

Base-plates for switchgear shall be installed before final screeding of the switchroom floor. Switchroom floor screeding shall be completed and levelled before switchgear is brought into the substation and installed. Floor fixings shall be checked to ensure that they are level, in the correct position to match the fixings of the switchgear, and in accordance with dimensions given on the drawings. Correct clearances and also location of cables and bus duct outlets shall be checked in relation to trenches holes through slabs, ducts and bus ducting. Floor in front of the cubicles shall be level & smooth to facilitate easy movement of withdrawable units. 6.1.3

Installation

Before installation starts switchroom floors shall be clean and tidy. Installation of switchgear shall be executed in accordance with the Vendor's information. Only nuts, bolts and washers supplied with switchgear shall be used for bolting switchgear, busbars, etc. The centre section shall be installed first (in its final position), such that when the complete switchboard is finally erected, correct clearances are obtained. The centre section shall be checked to ensure that it is vertical. The centre section shall be kept as flush to the floor as possible. It shall, if possible, be in direct contact with the fixing channel, so allowing any out-of-level flooring to be evenly spread over the whole length of the switchboard. Initially, fixing bolts shall be hand-tight only. Before placing each section, checks shall be made for any items such as bushings, traps wires, links, packing, etc., that need to be threaded or inserted, before placing of the adjacent section, ensuring that such items are not tightened. Final placing of sections to either side of the centre section shall be undertaken alternately, with levelling and skimming as necessary. Serial numbers of each unit shall be checked against arrangement drawings to ensure that each section occupies its correct position. Each section shall be bolted, and tight, to the fixing channel. Fixing bolts shall be used in every position that has been provided for them. Bus bar contact surfaces and tee-off connector surfaces shall be checked to ensure that they are clean on both sides. Page 29

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After cleaning, faces shall be wiped with a clean rag to remove all dust; particular care shall be taken to keep metal dust from bus bar insulation. Starting at the centre section and working outwards, busbars shall be placed in position and loosely clamped, ensuring that force is not used. Starting at the centre section and working outwards in each direction, floor fixing bolts shall be tightened on each unit in turn, taking up even pressure on each bolt. As each panel is completed, checks shall be made to confirm that it is perfectly vertical. All units shall be completed in this manner. Between fixing of sections, busbars and insulators shall be checked to ensure that no strain is placed o them. Following tightening of each section, alignment shall be checked to ensure that all withdrawable units can be inserted and withdrawn. All doors shall be checked for proper operation. Working from the centre, each pair of side panels shall be tightened together. All bushes and earth connection shall be tightened. Working from the centre section, busbars shall be tightened and insulators checked. Positioning and tightening of busbars shall be such that no strain is placed on insulators, teeoff connectors, etc., and busbars are correctly aligned. All extraneous material, objects, etc., shall be removed from the busbars chamber and busbars covers replaced.

6.1.4

Earthing and Bonding

Switchboard shall be earthed and bonded in accordance with the earthing layout design drawings, the Manufacturer's instructions and section 3.2 6.1.5

Instruments and Relays

Any instruments or relays supplied loose with switchboards shall be fitted, and connected in accordance with the Vendor's diagrams. All relays shall be cleaned of dust, and shall have all packing and shipping stops removed. Compressed air shall not be used to clean internal relay parts. Before any loose items are fitted they shall be checked against the drawings to ensure that they are fitted in the correct position on the correct section.

6.1.6

Wiring

Switchboard will be completely internally wired in the Manufacturer's works, but all inter-panel wiring shall be fixed and connected in accordance with the wiring diagrams. When loose items of equipment have been fixed, they shall be connected in accordance with the wiring diagrams. 6.1.7

Electrical / Instruments Interface Boxes

The E / I (Electrical / Instrument) Interface Boxes , as far as possible, shall be located in the switch gear room. If switchgears are located in different locations then separate interface boxes shall be provided for each switchgear.

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If the interface boxes are located in control rooms, then XLPE insulated cables shall be used between the interface box and switchgear to reduce cable capacitance. If these cable runs are more than 200m then prior approval shall be obtained from the Company representative for this arrangement.

6.2

Transformers

6.2.1

General Requirements

Transformers shall be either collected from the stores compound or other place, or received directly from the Manufacturer's works, and placed on prepared and pre-checked foundations. Transformers shall be positioned centrally on foundation blocks, and clearances shall be checked. Transformers shall be finally positioned for line and level to the dimensions given on the drawings. Particular care shall be taken in positioning in relation to cable, cable duct and bus trunking positions. Transformers shall be mounted on skids. If wheels have been supplied, they shall be removed and returned to the site stores. Any fittings supplied loose shall be fitted and transformers finally trimmed out overall. 6.2.2

Power Transformer Connections

Primary and Secondary cables shall be terminated and connected, as per the drawings. Extra care shall be taken to avoid any strain on the bushings due to cable connection. Supporting insulators and enclosure shall be thoroughly cleaned. Insulators shall be inspected for damage, cracking and insulation properties. Cable marking shall be in accordance with Section 3.12.

6.2.3

Connections for Specific Purpose Transformers

Where residual current transformers are installed, the magnetic circuit of the transformers shall enclose all live conductors of the circuit. The corresponding protective (earth return) conductor shall be outside the magnetic circuit. Every inductor and high-reactance transformer for discharge lighting shall be placed as near as practicable to its associated discharge lamp. 6.2.4

Earthing and Bonding

Transformers shall be earthed and bonded in accordance with the relevant layout drawings and Section 2.3

6.3

Batteries and Battery Rectifier

6.3.1

General Requirements

Care and maintenance of batteries and battery control equipment shall be in accordance with Manufacturer's instructions. All batteries and battery control equipment shall be inspected prior to their installation.

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Petroleum Development Oman LLC 6.3.2

Revision:6.0 Effective: Nov. 2016

Battery Installation and Battery Rooms

Battery installation shall be as per DEP 33.64.10.10-Gen, clause 6.1.3.3. When the total capacity of the vented batteries exceeds 20,000 VAH, a separate battery room shall be provided and all the electrical equipment in the room shall be suitable for Zone-1, gas group-C, as specified in the above DEP. Fuse / switch unit used for isolation of batteries, if not certified for use in Zone-1 area, shall be installed outside the battery room. The cables between batteries and the fuse / switch unit shall be adequately sized. 6.3.3

Safety

Persons performing work of installation of batteries shall take every precaution to prevent accidents to personnel, particularly when handling batteries and/or electrolyte. When mixing electrolyte, protective goggles, rubber or PVC gloves, apron and boots shall be worn. The environment shall be well ventilated. Before electrolyte is handled, suitable medical supplies shall be provided at the place of work together with a plentiful supply of clean water. Particular care shall be taken to ensure that no spark or naked light is allowed near batteries; particular care shall be taken in the installation of charged batteries or when charging batteries. 6.3.4

Foundations and Positioning

Room floor finish shall be completed before batteries and battery control equipment are brought into a battery room. Floor and equipment fixings shall be checked to ensure that levels are in accordance with the dimensions given on the drawings. Correct clearance and location of cable outlets shall be checked in relation to trenches and holes through slabs and ducts. Acid/Alkaline resistant type tiles shall be used for flooring. Before erection starts, floors shall be thoroughly cleaned. Mechanical and natural ventilation shall be checked to ensure that it will be ready before battery charging begins and that pockets of hydrogen gas cannot form. 6.3.5

Panels and Racks

Battery control equipment panels shall be bolted to the floor, shimming where necessary to ensure that the panels are perfectly vertical and plumb. Panel doors shall be checked for correct operation and locking. Panels shall be checked to ensure that they are perfectly clean and that all packing has been removed. Battery racks shall be positioned and bolted, if specified, to floors and walls as detailed. They shall be shimmed where necessary to ensure that racks are perfectly vertical and plumb. Fixing bolts shall be used in every position that has been provided for them. Where batteries are mounted on removable trays or racks, such items shall be checked for alignment before the panel fixing bolts are finally tightened. 6.3.6

Loose Equipment

All items of equipment supplied loose shall be fitted in accordance with Manufacturer's instructions. 6.3.7

Batteries

Batteries shall be placed on trays or racks and positioned correctly for inter-cell and inter-tier connectors. Both inter-cell and inter-tier connections shall be connected in the correct Page 32

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series/parallel arrangement, as indicated on the drawings, ensuring that no strain is placed on battery terminals. When final adjustments have been made, all bolts shall be tightened and shrouds fitted to the terminals. Batteries shall be connected to battery control equipment ensuring correct polarity. 6.3.8

Filling and Charging

Batteries shall be charged as soon as possible after they have been received. Batteries that are supplied filled shall have their electrolyte level checked and if necessary topped-up with distilled water. Specific gravity of batteries received as filled shall be checked. Batteries that are supplied unfilled shall be filled with the correct electrolyte. Electrolyte may be received on site ready for use or the ingredients only may be provided. When the ingredients of the electrolyte are provided they shall be made up in accordance with the electrolyte or battery instructions, ensuring that the correct specific gravity is obtained. Batteries shall be allowed to stand for 24 hours subsequent to filling before charging commences. Battery charging shall be performed strictly in accordance with the Manufacturers' instructions. Electrolyte temperature during charging shall be checked to ensure that the temperature does not at any time exceed the specified safe maximum temperature. With rapid charging of the battery, output voltage of the rectifier may rise above acceptable values. In this case, the unit shall be disconnected from the load, and a mechanical interlock between the rapid charge switch and rectifier outgoing switch shall be provided. The rapid charging operation shall only be done manually. The rapid charge may be left in auto after manually switching on to rapid charge, only if the charging system is equipped with auto control and limiter for current / voltage is available. Application of voltage dropping diodes and parallel contactor and/or similar devices in series with the DC output to limit the voltage range, shall not be acceptable. When charging has been completed, the electrolyte level shall be checked and topped up with distilled water if necessary. Battery tests sheets shall be submitted to the Company Representative at the end of each charging period. They shall show the time and charging rate with time, electrolyte Discharge tests (autonomy tests) shall be carried out prior to the commissioning of the battery sets. 6.3.9

Alarms

Battery alarms shall be connected and tested to ensure correct operation. 6.3.10

Labels

If cells of batteries are supplied without cell numbers, then all cells shall be numbered with corrosion-resistant markers. 6.3.11

Earthing and Bonding

Panels shall be earthed and bonded in accordance with layout drawings and Section 2.3 of this Specification.

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Petroleum Development Oman LLC 6.4

Electric Motors

6.4.1

Installation

Revision:6.0 Effective: Nov. 2016

All motors shall be installed on prepared and checked foundation/bed plates. 6.4.2

Alignment

All motors shall be checked to ensure that alignment and level is in accordance with the relevant installation drawings and Manufacturers' instructions. 6.4.3

Cable Connections

Cables shall be terminated and connected in accordance with Section 3.9, 3.10 and 3.11 of this Specification 6.4.4

Earthing

Motors shall be connected to the installation earth ring in accordance with the Electrical Standard Drawings and Section 3.20

6.5

Lighting

6.5.1

General Requirements

All luminaries, lighting columns, pendants accessories, etc., shall be suitable for immediate installation when received on Site. Making good of equipment prior to final fixing shall not be permitted. Outdoor lighting poles shall be hinged dropout types to facilitate easy maintenance work Installation shall be in accordance with individual Manufacturer's recommendations and instructions. Diffusers, louvers, and glass ware for luminaries shall be cleaned and treated with anti-static solution prior to installation. Where storage on Site for luminaries prior to installation is required, adequate provision for protection from ingress of water and dust, together with mechanical protection, shall be provided. 6.5.2

Foundations and Positioning

All lighting column foundation blocks shall be checked prior to placing of columns, to ensure that when columns are erected they are in accordance with the dimensions given on the layout drawing, and that location of cable entries are in correct positions relative to the incoming cable duct. All accessories shall be mounted square and plumb. Luminaries shall be mounted at heights given in the schedules or on the layout drawings, using the method of fixing stated. 6.5.3

Installation and Erection

Installation shall be in accordance with individual Manufacturer's instructions. Lighting columns shall be erected to line and level and shall be perfectly plumb on completion of erection. Page 34

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Fluorescent fittings shall not be installed direct on the non-fire resistant type false ceilings. A 50mm gap shall be provided between the false ceiling and the light fitting by providing metallic spacers in between. Adequate mechanical handling facilities shall be provided by the Contractor to achieve satisfactory erection and inspection of lighting columns. 6.5.4

Wiring

Lighting columns, pendants and individual luminaries shall be checked by the Contractor against the manufacturers wiring diagrams to ensure that they are completely internally wired prior to acceptance on site. 6.5.5

Connections

Cables shall be terminated and connected in accordance with Sections 3.9, 3.10 and 3.11, and shall be made in accordance with the lighting schedules. Heat resistant type cables shall be used to connect light fittings producing high temperature, like flood light fittings. 6.5.6

Earthing and Bonding

All luminaries, lighting, lighting, columns, pendants, accessories and the like shall be earthed and bonded in accordance with the Electrical Standard Drawings and Section 3.20.

6.6

Small Power

6.6.1

General Requirements

All small power outlets shall be suitable for immediate installation when received on Site. Making good of equipment prior to final fixing shall not be permitted. 6.6.2

Installation

Installation shall be in accordance with individual Manufacturers' instructions. Accessories shall be mounted square to line and level and plumb. Accessories shall be mounted at heights given in the schedules or on the layout drawings, using the method of fixing stated. If no height is given on the schedule or layout drawing where a accessory is mounted vertically on a structure, it shall be mounted at a height above the floor or any working surface such as to minimise risk of mechanical damage. 6.6.3

Connections and Terminations

Cable shall be terminated and connected in accordance with Sections 3.9, 3.10 and 3.11, and shall be made in accordance with the small power schedules. 6.6.4

Earthing and Bonding

Small power outlets shall be earthed and bonded in accordance with the Electrical Standard Drawings and Section 3.20

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Petroleum Development Oman LLC 6.7

Distribution Boards

6.7.1

General Requirements

All distribution boards shall be inspected to ensure that they are in a suitable condition to be installed. Only correct size and type of tools shall be used in the erection of distribution boards. 6.7.2

Fixings and Positioning

It shall be ensured that the wall to which a distribution board is to be fixed is flat so that no undue distortion of the casing takes place. Distribution boards shall be located in accordance with design installation drawings. They shall be checked to ensure current alignment with trenches, holes through slabs, ducts, and trunking. 6.7.3

Installation

Before erection starts, locations shall be freely accessible. Correct diameter and length of fixing bolts and/or screws shall be used. Distribution boards shall be fixed with approved fixing in accordance with Section 2.5 Distribution boards shall be mounted 'square' with sides plumbed. Mounting heights shall be as shown in drawings or stated in the design specification. 6.7.4

Main Cable Connection

Main incoming and outgoing cables shall be terminated and connected in accordance with Sections 3.9, 3.10 and 3.11and 2.2.1.11. Connections shall be made in accordance with the sub-main distribution diagrams. Enclosures and the MCBs shall be thoroughly cleaned and checked for damage. 6.7.5

Earthing and Bonding

Distribution boards shall be earthed in accordance with Electrical Standard Drawings and Section 3.20 of this Specification.

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7 APPENDICES APPENDIX 1 -CABLE JOINTER'S TOOL KIT

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

Page 37

1 x Hammer 300g 1 x Screwdriver 3.5 mm 1 x Screwdriver 6.5 mm 1 x Hacksaw 1 x Hacksaw junior 1 x Pipe Wrench, size 250 1 x Side cutter, size 160 1 x Pincers, size 180 1 x Combination Pliers, size 180 1 x Scissors size 200 1 x Folding rule, size 2 1 x Wirebrush, size 4 2 x Spreader 3-way 2 x Wedges 1 x Can of cleaning solvent 1 x Hook knife 1 x Cable knife 1 x Sharpening stone 125 x 50 1 x Control mirror 100 x 100mm File set medium, size 200 1 x Stripping tool for bonded screens, round conductor 1 x Stripping Tool for bonded screens, sector shaped conductor (5 VW 101) 1 x Gas torch set 1 x Scoring tool for easy strip screens 1 x Diameter tape 1 x Leather tool case

Specification for Electrical Installation Practice

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Petroleum Development Oman LLC

APPENDIX A - GLOSSARY OF DEFINITIONS, TERMS AND ABBREVIATIONS The following terms and abbreviations used in this document, are defined below: General Terminology Shall

-

The word 'shall' is to be understood as mandatory.

Should

-

The word 'should' is to be understood as strongly recommended.

May

-

The word 'may' is to be understood as indicating a possible course of action.

The Company

-

Petroleum Development Oman L.L.C. Muscat, Sultanate of Oman.

User

-

A specified engineer or Consultant who applies these Standards in the execution of PDO project.

Representative

-

Company, having the functions set forth in Article 3 of General Conditions for Construction Works, and whose authority shall be notified in writing to the Contractor by the Company.

The Consultant

-

The party to the contract with the Company who is responsible for providing the design, engineering and other related consultancy services under the contract.

The Contractor

-

The party to the Contract with the Company who is responsible for the construction and other related works specified in the contract. On occasion, for example in 'turnkey' or 'EPC' type of contracts' the contractor may be responsible for design, engineering, manufacture, shipment, supply, installation, testing, commissioning and performance guarantee up to the defects liability period as defined in the individual contract.

Manufacturer

The party responsible for the manufacture of equipment and services to perform the duties specified by the Consultant or Company.

Vendor/Supplier -

A party responsible for the supply of equipment, materials or product related services in accordance with the Purchase Order issued by PDO or its nominated Purchasing Office

. Works

-

All Works to be executed and all services to be rendered by a Contractor under the terms of a Contract.

Worksite

-

A defined place designated by the Company whereat all Works and services shall be executed by a Contractor under a Contract.

Abbreviation AC

-

Alternating Current.

CFDH

-

Corporate Functional Discipline Head

DC ERA ERD

-

Direct Current. Electrical Research Association. Engineering Reference Document (old revision of SP).

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Petroleum Development Oman LLC HV IEC IEE IP IP54 LV PDO PR IP54 PVC SIEP SIOP SP

Page 39

-

Revision:6.0 Effective: Nov. 2016

High Voltage. International Electrotechnical Commissions. Institution of Electrical Engineers (UK). Institute of Petroleum (UK). Degree of protection of enclosures as defined in IEC 529. Low Voltage. Petroleum Development Oman LLC. Procedure (PDO Standard) Degree of protection of enclosures as defined in IEC 529. Poly Vinyl Chloride. Shell Internationale Exploration and Production B.V.SIOP Shell International Oil Products B.V. Specification (PDO Standard))

Specification for Electrical Installation Practice

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Petroleum Development Oman LLC SP USER-COMMENT FORM SP User-Comment Form

If you find something that is incorrect, ambiguous or could be better in an SP, write your comments and suggestions on this form. Send the form to the Document Control Section (DCS). They make a record of your comment and send the form to the correct CFDH. The form has spaces for your personal details. This lets DCS or the CFDH ask you about your comments and tell you about the decision. SP Details Number:

Title

Issue Date:

Page number:

Heading Number:

Figure Number:

Comments:

Suggestions:

User’s personal details Name:

Ref. Ind:

Signature:

Date: Phone:

Document Control Section Actions Comment Number:

Dates Recd:

To CFDH:

CFDH Ref. Ind:

CFDH Actions Decision: Reject: Accept, revise at next issue: Accept, issue temporary amendment Comments: Recd Date:

Originator Advised:

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Date:

Inits:

Inits:

Document Control Section Advised:

Specification for Electrical Installation Practice

Ref. Ind:

Date:

Date:

Inits:

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Petroleum Development Oman LLC

8 APPENDICES 8.1

Appendix 1, Glossary of Definitions, Terms and Abbreviations

The following terms and abbreviations used in this document are defined below:

General Terminology Company

-

Petroleum Development Oman LLC

Principal

-

The person or organisation that specifies the requirements in a contract and pays the contractors and vendors for their services, materials and equipment.

CFDH

-

The person responsible for a discipline in the Company. The CFDH approves the SPs that apply to his discipline

Discipline

-

A specific set of technical knowledge and skills

Contractor

-

The person or organisation that supplies the company with services.

Purchaser

-

The person or department in PDO or an authorised contractor on behalf of PDO, places order for equipment / materials with Supplier

Vendor

-

The person or organisation that manufactures / fabricates the equipment / materials

Supplier

-

The person or organisation that receives order for supply of equipment / materials to the Company or on behalf of the Company

User

-

The person or organisation that reads, and uses the information, in this and other SPs

Shall

-

Indicates a requirement.

Should

-

Indicates a recommendation

may

-

Indicates an option

kA

-

Kilo Ampere

AC

-

Alternating Current

AIS

-

Air Insulated Switchgear

AVR

-

Automatic Voltage Regulator

CFDH

-

Corporate Functional Discipline Head

DC

-

Direct Current

DEP

-

Design Engineering Practice

GIS

-

Gas Insulated Switchgear

kV

-

kilo Volt

LCD

-

Liquid Crystal Display

Abbreviations

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