Electrical Drawing Standards -nec

A M E R I C A N

N A T I O N A L

S T A N D A R D

NECA 100-2006

xxAF yyAT

zzA

Symbols for Electrical Construction Drawings

Published by

National Electrical Contractors Association

Table of Contents

Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iii 1. 1.1 1.2 1.3

Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Symbols Included . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Symbols Not Included . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Regulatory and Other Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

2. 2.1 2.2 2.3

Purpose of Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Organization of this Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Alternate Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Referrences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

3. 3.1 3.2 3.3 3.4

Drafting Practices for Electrical Construction Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Symbol Design and Presentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 General Drafting Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 CADD Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Electrical Construction Drawing Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Contents for Symbol Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Annex A: Alternate Fire Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45 Annex B: Typical Risers, One-Line Diagrams, and Schedules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48 Annex C: Reference Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

i ■

1. Scope

This publication describes graphic symbols used to represent electrical wiring and equipment on construction drawings. In this publication, the term “electrical” is used to include electrical, electronic, and communications systems covered by the National Electrical Code (NFPA 70). This publication also summarizes recommended drawing practices for electrical construction drawings.

1.1

Symbols Included

This standard is limited to North American symbols for electrical wiring and equipment.

1.2

1.3 Regulatory and Other Requirements a) All information in this publication is intended to conform to the National Electrical Code (ANSI/NFPA 70). b) General requirements for installing electrical products and systems are described in NECA 1, Standard Practices for Good Workmanship in Electrical Contracting (ANSI). Other National Electrical Installation Standards provide additional guidance for installing particular types of electrical products and systems. A complete list of NEIS is provided in Annex C.

Symbols Not Included

Symbols from publications of the International Electrotechnical Commission (IEC) are not included in this standard. Symbols for equipment and systems not covered by the NEC are not included in this standard.

1 ■

2. Purpose of Symbols

Symbols are a shorthand way of showing the locations, types, and sizes or ratings of electrical wiring

Table 1: Symbol Groups Group 1.0 1.1 1.2 2.0 2.1 2.2 2.3 2.4 3.0 4.0 5.0 5.1 6.0 7.0 7.1 7.2 8.0 9.0 9.1 9.2 10.0 11.0 11.1 11.2 12.0 13.0 14.0 ■ 2

Descrption Wiring Methods Raceways—Indicators Raceways—Boxes and Busways Luminaire (Lighting Fixtures) Luminaire Fixtures—Basic Modifiers Mounting Luminaire Fixtures—Basic Modifiers Orientation Luminaire Fixtures—Basic Modifiers Emergency Luminaire Fixtures—Extended Fixtures Outlets and Receptacles Switches and Sensors Motors—Controls Motorized & HVAC Equipment Security Fire Alarm Communications & Panels Fire Alarm Indicators Fire Alarm Sensors Distribution Equipment Communications—Teledata Communications—Audio/Visual Communications—Equipment Site Work Schematic Fault Circuit Interrupter, Personal Protection One-Line Diagram Symbols— Switchboard Meters Schematic and One-Line Diagram Symbols—Switches Miscellaneous Abbreviations Nurse Call System

and equipment, and the interrelationships between these items. It should be emphasized that drawings need to be supplemented with specifications in order to establish the details of the electrical systems.

2.1

Organization of this Standard

This standard contains symbols commonly and primarily used on electrical construction drawings. Related symbols are organized into different groups, and each symbol within a group has its own unique identifying number. The group and symbol numbers are not significant except as a convenient way to identify individual symbols. See Table 1 for groups.

2.2

Alternate Fire Safety Symbols

The fire protection industry has developed and published symbols, not all of which are currently in widespread use on electrical construction drawings. They are shown for reference in Annex A.

2.3

References

This publication does not include every known North American symbol for electrical equipment shown on construction drawings. Some older symbols are either becoming obsolete over time or have been superseded by newer symbols (which are shown in this publication). Some electrical symbols are not widely used on construction drawings, but usually on wiring schematics and other types of more specialized drawings. Other drawing symbol standards and publications are listed for reference in Annex C.

3. Drafting Practices for Electrical Construction Drawings 3.1

Symbol Design and Presentation

a) The symbols in this standard are widely understood by those in the electrical design and construction field. Other symbols may also be used, provided that a suitable explanation of their meaning is included on the drawing where that symbol is used, or on a symbol legend sheet. b) The orientation of a symbol on a drawing does not alter the meaning of the symbol. c) Every symbol making up part of an electrical circuit must begin with and end with another symbol. When a circuit continues on a different drawing, the end of the circuitry symbol must be appropriately noted on both drawings. This circuitry continued notice is necessary for both vertical and horizontal circuits. d) Circuitry symbols may cross one another at any angle. e) The angle at which a circuitry symbol meets another symbol has no particular significance unless otherwise noted. Circuits normally meet one another at a junction box, pull box, or piece of electrical utilization or communications equipment. f) Future circuits and future equipment should be indicated by dashed lines and clearly marked as future circuits or future equipment on every drawing where applicable. g) Luminaire symbols should be drawn whenever possible in their appropriate proportions, orientation, and shape. Where a luminaire symbol drawn to scale is too small to reproduce clearly, the symbol

may be enlarged to an appropriate size while maintaining proportion and orientation.

3.2

General Drafting Practices

a) Electrical systems should be shown on plans separate from the architectural, structural, mechanical, and other systems. For clarity, it is recommended that the electrical symbols be drawn darker than the background drawing showing the building structure and/or other systems. b) Different electrical systems such as power distribution, luminaire, voice/data, fire alarm, and security/ access control should be shown on separate plans if combining them on the same drawings would reduce clarity. c) Electrical plans are generally drawn to scale. However, graphic symbols indicate only the approximate locations of electrical equipment. Provide dimensions, details, elevations, and sections where accurate locations of outlets, lighting fixtures, and other equipment are required. d) Electrical wiring required for other systems such as HVAC, manufacturing equipment, data processing systems, etc, should be shown on the electrical drawings where practical, if the installation is included in the electrical contract.

3.3

CADD Practices

The following drafting practices are recommended when using computer-aided design and drafting (CADD) systems to prepare electrical construction drawings. a) All CADD electrical construction drawings should be created at full scale, (1" = 1"), and should be plot3 ■

NECA 100

Symbols for Electrical Construction Drawings

ted at an appropriate scale on uniform sheets of sufficient size and separate from architectural, structural, mechanical or other drawings. Within a single drawing set, the drawing scale should be the same on as many drawings as possible. b) All electronic files should include no more than one floor level of a building per electronic file. In no case should two different floors of any building be included in one electronic file. c) Architectural, structural or mechanical items on the electrical construction drawings should be plotted with lighter weight lines than the electrical items. d) Electronic files should use blocks (or cells) for all symbology. Blocks (or cells) should use a uniform scale. Non-uniformly scaled blocks and nested blocks should not be used. Instead of exploding blocks to achieve a desired graphic effect, create different variations of an existing block to accomplish the graphic symbol appearance needed. e) No entities should reside on layer 0. This layer is used for referencing of blocks and blocks only. f) All entities should be placed on layers related to their disciplines as defined by the CAD Layer Guidelines published by the American Institute of Architects. These include Electrical, Plumbing, HVAC, Architectural, Structural, Civil/Site, Mechanical, Process Piping, and Telecommunications/Data. The purpose of using different layers is to rationally develop designs using shared drawings. Therefore, it is suggested that the AIA layer naming convention be followed. Ordering information for CAD Layer Guidelines is shown in Annex C.

3.4

Electrical Construction Drawing Set

A typical set of electrical construction drawings includes the following: a) Plan for each floor, roof, surrounding site, and other area with electrical installations. b) Site plan(s) showing incoming utility services and substations; exterior transformers; feeders, trunk ■

4

lines and backbone cables between buildings; and site lighting. c) Symbol list and abbreviation list. d) Schedule(s) of lighting fixtures, mechanical equipment connections, transformers, etc. as appropriate. Typical schedules are shown in Annex B. e) Riser and/or one-line diagram(s) for power distribution and other systems, as appropriate. Typical risers and one-line diagrams are shown in Annex B.

Contents for Symbol Groups

1.0

Wiring Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.1 Raceways - Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.2 Raceways - Boxes and Busways . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.0

Luminaire Fixtures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.1 Luminaire Fixtures—Basic Modifiers—Mounting. . . . . . . . . . 11 2.2 Luminaire Fixtures —Basic Modifiers—Orientation. . . . . . . . 11 2.3 Luminaire Fixtures —Basic Modifiers—Emergency . . . . . . . . 12 2.4 Luminaire Fixtures—Extended Modifiers . . . . . . . . . . . . . . . . . 12

3.0

Outlets and Receptacles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.0

Switches and Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.0

Motors—Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5.1 Motorized and HVAC Equipment . . . . . . . . . . . . . . . . . . . . . . . 20

6.0

Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

7.0

Fire Alarm Communications and Panels. . . . . . . . . . . . . . . . . . . . . . . . 23 7.1 Fire Alarm Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 7.2 Fire Alarm Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

8.0

Power Distribution Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

9.0

Communications - Teledata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 9.1 Communications - Audio/Visual . . . . . . . . . . . . . . . . . . . . . . . . 30 9.2 Communications - Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . 31

10.0

Site Work. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

11.0

Schematic Fault Circuit Interrupter, Personal Protection . . . . . . . . . . 33 11.1 One-Line Diagram Symbols—Switchboard Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 11.2 Schematic and One-Line Symbol Diagrams—Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

12.0

Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

13.0

Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

14.0

Nurse Call System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

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NECA 100

Symbols for Electrical Construction Drawings

1.0 Raceways Number

Preferred Symbol

Description

1.001

Conduit concealed in finished areas, exposed in unfinished areas.

1.002

Conduit concealed in or under floor slab.

1.003

Non-rigid raceway system.

1.004

NE

Normal/emergency circuit.

1.005

EB

Emergency battery system wiring, minimum 10 AWG.

1.006

HT

Heat trace.

1.007

P

Underfloor power raceway.

1.008

T

Underfloor telecommunications raceway.

1.009

PT

1.010

S

1.011

PTD

Underfloor raceway for power, telephone, and data.

1.012

UCP

Undercarpet flat conductor cable (FCC) wiring system, power.

UCT

Undercarpet flat conductor cable (FCC) wiring system, telephone

1.013

■ 6

Underfloor raceway for power and telecommunications.

Underfloor signal raceway.

NECA 100

Symbols for Electrical Construction Drawings

1.1 Raceways—Indicators Number

Preferred Symbol

Description

1.101

Conduit stub. Terminate with bushing or cap if underground.

1.102

Conduit turning up.

1.103

Conduit turning down.

1.104

SZ 2C,4#1&1#6GND. OR SZ 53cm,4#1&1#6GND.

1.105

(2)SZ 2C,4#1&1#6GND. OR (2)SZ 53cm,4#1&1#6GND.

1.106

Indicates trade size 2” or 53 mm conduit with (4) 1 AWG and (1) 6 AWG ground.

Indicates (2) trade size 2” or 53 mm conduits with (4) 1 AWG and (1) 6 AWG ground conductors in each conduit.

Homerun to panelboard. Number of arrows indicates number of circuits. (Example: Homerun to panel L211 CKTS. #1 and #3.)

L211–1,3

1.107

Flexible connection to equipment.

1.108

Direct connection to equipment.

1.109

Branch circuit, full hashes indicate ungrounded-“hot” (or switch-leg) circuit conductors. Half hashes indicates grounded neutral circuit conductors. (No hashes indicates 1 hot and 1 neutral.) Dots indicate grounding conductors. Equipment bond size U.N.O. “IG” indicates an isolated grounding conductor.

IG

■ 8

Symbols for Electrical Construction Drawings

NECA 100

1.2 Raceways—Boxes and Busways Number

Preferred Symbol

1.201

Description Underfloor raceway system junction box, flush floor mounted.

J

1.202

P

Power pole with devices indicated in the specifications and on the drawing, “P” indicates type, “2” indicates circuit. 2

1.203

T

1.204

TP

Telecom pole with devices indicated in the specifications and on the drawings, “T” indicates type.

Telecom/Power pole with devices indicated in the specifications and on the drawings, “TP” indicates type, “2” indicates power circuit.

2 1.205

Pull box—size as indicated or required. PB OR

1.206

Cabletray size as indicated. TR

TR

TR

TR

TR

TR

BW

BW

BW

Busway with cable tap box, rating and type as indicated on drawings.

BW

Busway with plug-in device as indicated, shown with fused disconnect.

1.207

Cabletray size as indicated, concealed.

1.208 CTB

1.209 BW

BW F

1.210

Busway feeding up.

1.211

Busway feeding down.

1.212

Busway expansion joint. BW

1.213

Wireway, size as indicated or required. WW

WW

WW

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NECA 100

Symbols for Electrical Construction Drawings

2.0 Luminaire (Lighting Fixtures) Number

Preferred Symbol

Description

2.001

Luminaire: (drawn to approximate shape and to scale or large enough for clarity).

2.002

Luminaire strip type (length drawn to scale).

2.003

Fluorescent strip luminaire.

2.004

Fixture—double or single head spotlight.

2.005

Exit luminaire fixture. Arrows and exit face as indicated on drawings (mounting heights to be determined by job specifications).

2.006

Light track. Length as indicated on the drawings, with number of fixtures as indicated on drawings, and as indicated in the fixture schedule.

2.007

Emergency battery remote luminaire heads.

2.008

Emergency battery unit with luminaire heads.

2.009

Single luminaire pole mounted site luminaire fixture.

2.010

Tw i n l u m i n a i r e p o l e m o u n t e d s i t e l u m i n a i r e f i x ture.

2.011

Roadway luminaire—cobra head.

2.012

Bollard type site luminaire.

2.013

Outdoor wallpack.

■ 10

Symbols for Electrical Construction Drawings

NECA 100

2.1 Luminaire Fixtures—Basic Modifiers Mounting Number 2.100

Preferred Symbol

Description Surface mounted fixture.

Recessed fixture.

Wa l l m o u n t e d f i x t u r e .

Suspended, pendant, chain, stem or cable hung fixture.

Pole mounted with arm.

Pole mounted on top.

In-ground or floor mounted. (Box around symbol.)

2.2 Luminaire Fixtures—Basic Modifiers Orientation 2.200

A c c e n t / d i r e c t i o n a l a r r o w, w i t h o r w i t h o u t t a i l . (Drawn from photometric center in direction of optics or photometric orientation.) Directional aiming line. (Drawn from photometric center and may be extended to actual aiming point if required.) Tr a c k m o u n t e d ; l e n g t h , l u m i n a i r e t y p e s a n d q u a n t i t i e s a s s h o w n . ( Tr a c k l e n g t h d r a w n t o scale.)

11 ■

NECA 100

Symbols for Electrical Construction Drawings

2.3 Luminaire Fixtures—Emergency Number

Preferred Symbol

Description

2.300

NOTE:

Luminaire providing emergency illumination. (Filled in.) M o d i f i e r s a r e s h o w n w i t h s p e c i f i c b a s e s y m b o l s f o r c l a r i t y. Each modifier can be used with any of the base symbols.

2.4 Luminaire Fixtures—Extended Modifiers 2.401

A a 2

2.402

A a

+48”

NL 2

Standard designations for all luminaire fixtures. “A” = Fixture type, refer to fixture schedule “NL” = Unswitched night light “2” = Circuit number “a” = Switch control

Mounting height.

2.403

Louvers.

2.404

Recessed, emergency fixture.

■ 12

Symbols for Electrical Construction Drawings

NECA 100

3.0 Outlets and Receptacles Number

Preferred Symbol

3.001

Description Floor duplex receptacle. F=flush MTD. S=surface MTD.

F

3.002

3.003

D u p l e x c o n v e n i e n c e r e c e p t a c l e . 2 0 A 1 2 5 V.

Duplex convenience receptacle on emergency/standby circuit. Specify panelboard and circuit.

EP–2 CKT.1

3.004

3.005

Single convenience receptacle.

Single convenience receptacle on emergency/standby circuit. Specify panelboard and circuit.

EP–2 CKT.3

3.006

3.007

Double duplex convenience receptacle.

Double duplex convenience receptacle on emergency/standby circuit. Specify panelboard and circuit.

EP–2 CKT.5

3.008

Multi-outlet assembly with outlets on centers as indicated on the drawings and in the specifications, mounted 6" above counter or at height as directed, A - indicates type.

A 3.009

M u l t i o u t l e t a s s e m b l y, d e v i c e s a s i n d i c a t e d .

1

3.010

1

Special receptacle - typical notation: 1— indicates example

1

OR

“ 1 ” = _ _ A , _ _ _ / _ _ _ V. , _ P o l e , _ W i r e , _ N E M A _ _ - _ _ “ 2 ” = _ _ A , _ _ _ / _ _ _ V. , _ P o l e , _ W i r e , _ N E M A _ _ - _ _ “ 3 ” = _ _ A , _ _ _ / _ _ _ V. , _ P o l e , _ W i r e , _ N E M A _ _ - _ _

3.011

Clock hanger outlet recessed mounted 8’-0” AFF or 8” below ceiling as appropriate and as directed.

3.012

Flush mounted floor box, adjustable, with both power and voice/data receptacles.

F 3.013

J

J

Junction box. “AxBxC” indicates dimensions of junction box in either inches or centimeters.

AxBxC

13 ■

NECA 100

Symbols for Electrical Construction Drawings

3.0 Outlets and Receptacles Number

Preferred Symbol

Description

3.014

D u p l e s r e c e p t a c l e c e i l i n g m o u n t e d 2 0 A 1 2 5 V.

3.015

Double duplex receptacle—ceiling mounted.

Receptacles And Outlets Ty p i c a l O u t l e t N o t a t i o n s : “a”

=

Switched outlet, “a”—indicates switch control.

“B”

=

Pedestal mounted on bench top.

“BF”

=

B e l o w f l o o r.

“C”

=

M o u n t e d 6 ” a b o v e c o u n t e r o f 4 2 ” A F F. C o o r d i n a t e e x a c t m o u n t i n g h e i g h t w i t h architectural drawings.

“CLG”

=

Ceiling mounted.

“D”

=

Dedicated device on individual branch circuit.

“E”

=

E m e r g e n c y. Existing device/equipment.

“F”

=

Flush floor box with fire/smoke rated penetration.

“GFCI”

=

G r o u n d f a u l t c i r c u i t i n t e r u p t e r, p e r s o n a l p r o t e c t i o n .

“GFPE”

=

Ground fault protection of equipment.

“H”

=

Horizontally mounted.

“IG”

=

Isolated ground receptacle with separate green ground conductor to isolated ground bus in panel.

“M”

=

Modular furniture service—provide flexible connection, coordinate exact location with furniture plans.

“PED”

=

Pedestal mounted with two hour fire/smoke rated penetration.

“PT”

=

Poke thru with two hour fire/smoke rated penetration.

“S”

=

Surface mounted floor box.

“SP”

=

Surge protection receptacle.

“T”

=

Ta m p e r r e s i s t a n t s a f e t y r e c e p t a c l e .

“TL”

=

Tw i s t - l o c k .

“W”

=

Wa l l m o u n t e d d e v i c e a t 4 8 ” A F F u n l e s s o t h e r w i s e i n d i c a t e d .

“WP”

=

We a t h e r p r o o f r e c e p t a c l e w i t h “ N RT L ” l i s t e d c o v e r p l a t e f o r w e t l o c a t i o n w i t h plug installed. MTD. 48” AFF unless otherwise indicated.

+XX

=

Dimensioned height.

.

“ E X I S T. ” =

■ 14

Symbols for Electrical Construction Drawings

NECA 100

4.0 Switches and Sensors Number

Preferred Symbol

Description

4.001

$

or

S

Single pole switch.

4.002

$2

or

S2

Double pole switch.

4.003

$3

or

S3

Three way switch.

4.004

$4

or

S4

Four way switch.

4.005

$a

or

Sa

Switch control (lower case letter).

4.006

$CB

or

SCB

Circuit breaker switch.

4.007

$DT

or

SDT

Single pole/double throw switch.

4.008

$G

or

SG

G l o w s w i t c h t o g g l e , g l o w s i n o ff p o s i t i o n .

4.009

$H

or

SH

Horizontally mounted—with on position to the left.

4.010

$K

or

SK

Key operated switch.

4.011

$KP

or

SKP

Key operated switch with pilot light on when switch is on.

4.012

$LV

or

SLV

Low voltage switch.

4.013

$LM

or

SLM

Low voltage master switch.

15 ■

Symbols for Electrical Construction Drawings

NECA 100

5.0 Motorized and HVAC Equipment—Controls Number

Preferred Symbol

5.001

Disconnect switch, unfused type, size as indicated on drawings. “xxA” indicates amperage.

xxA

5.002

xxAF yyAT

5.003

F

xxAF CB yyAT

5.004

ASD

5.006

$M RV NEMA x

5.008

Disconnect switch, fused type, size as indicated on d r a w i n g s . “ x x A F ” i n d i c a t e s f r a m e s i z e . “ x x AT ” i n d i cates trip size. E n c l o s e d c i r c u i t b r e a k e r, s i z e a s i n d i c a t e d . “ x x A F ” i n d i c a t e s f r a m e s i z e . “ x x AT ” i n d i c a t e s t r i p s i z e .

M a g n e t i c c o n t a c t o r, s i z e a s i n d i c a t e d o n d r a w i n g s .

C

5.005

5.007

Description

F NEMA x xxA–xP

Adjustable speed drive.

Motor starter switch.

M a g n e t i c m o t o r s t a r t e r. “ RV ” i n d i c a t e s r e d u c e d voltage. Starter size as indicated.

Combination magnetic starter and disconnect switch. Starter size and fuse rating as indicated.

5.009

ATC

Automatic temperature control panel.

5.010

CP

Equipment control panel.

5.011

5.012

5.013

R

TD

TS P

R e l a y.

To g g l e d i s c o n n e c t s w i t c h .

Thermal motor switch with handle guard and padl o c k c a p a b i l i t y. “ P ” — i n d i c a t e s p i l o t l i g h t .

17 ■

NECA 100

Symbols for Electrical Construction Drawings

5.1 Motorized and HVAC Equipment Number

Preferred Symbol

5.101

Description C a p a c i t o r.

5.102

M o t o r “ 3 ” — i n d i c a t e s h o r s e p o w e r. 3

5.103

M o t o r i z e d d a m p e r. D

5.104

B a s e b o a r d h e a t e r.

5.105

Baseboard heater with box.

5.106

R e s i s t a n c e h e a t e r.

5.107

U n i t t y p e h e a t e r.

5.108

Ceiling fan.

5.109

Paddle fan.

5.110

Wa l l f a n .

5.111

Wa t e r h e a t e r. WH

■ 20

Symbols for Electrical Construction Drawings

NECA 100

7.0 Fire Alarm Communications and Panels Number 7.001

Preferred Symbol

M

7.002

Description Fire alarm master box.

F i r e f i g h t e r ’s p h o n e .

7.003

FT

C o d e d t r a n s m i t t e r.

7.004

DK

Drill key switch.

7.005

K

Key repository (knox box).

7.006

FAA

Annunciator panel.

7.007

FACP

Fire alarm control panel.

7.008

EVAC

Vo i c e e v a c u a t i o n p a n e l .

7.009

FATC

Fire alarm terminal cabinet.

7.010

BATT

B a t t e r y p a c k a n d c h a r g e r.

7.011

ASFP

Air sampling control/detector panel with associated air sampling piping network.

7.012

TPR

Tr a n s p o n d e r.

7.013

IAM

Individual addressable module.

23 ■

NECA 100

Symbols for Electrical Construction Drawings

8.0 Power Distribution Equipment Number

Preferred Symbol

Description

8.001

Lighting or power panel, recessed.

8.002

Lighting or power panel, surface.

8.003

Distribution panel.

8.004

Lighting or power panel on normal/generator f e e d e r.

8.005

D i s t r i b u t i o n p a n e l o n n o r m a l / g e n e r a t o r f e e d e r.

MCC

8.006

8.007

M o t o r c o n t r o l c e n t e r.

T T45-1 XFMR NUMBER

D r y t y p e t r a n s f o r m e r, r e f e r t o t r a n s f o r m e r s c h e d u l e , “T45”—indicates transformer type floor mounted. Unless otherwise indicated, “W”—indicates wall, “S”—indicates suspended. “R”—indicates K rating.

8.008

T

8.009

CT

8.010

G

8.011

M

Meter—single.

8.012

M

Meter and socket.

Tr a n s f o r m e r — p a d m o u n t .

Current transformer cabinet.

xxkW

8.013 TS

■ 28

G e n e r a t o r. S i z e a s n o t e d .

Tr a n s f e r s w i t c h . “ T S ” = m a n u a l t r a n s f e r s w i t c h . “ AT S ” = a u t o m a t i c t r a n s f e r s w i t c h .

NECA 100

Symbols for Electrical Construction Drawings

10.0 Site Work Number

Description

10.001

UF

U n d e r g r o u n d f e e d e r.

10.002

UT

Underground telephone.

10.003

UFA

Underground fire alarm.

10.004

UTV

U n d e r g r o u n d t e l e v i s i o n ( C AT V ) .

10.005

E

Above ground pole mounted electrical.

10.006

T

Above ground pole mounted telephone.

10.007

F

Above ground pole mounted fire alarm.

10.008

TV

A b o v e g r o u n d p o l e m o u n t e d t e l e v i s i o n ( C AT V ) .

10.009

MH

Manhole.

10.010

HH

Handhole.

10.011

P

10.012

10.013

■

Preferred Symbol

32

Pxxxx

E

T

U t i l i t y p o l e . “ P x x x x ” i n d i c a t e s p o l e n u m b e r.

Combination pre-fabricated manholes for power a n d t e l / d a t a s y s t e m s . “ E ” = d e n o t e s p o w e r, “ T ” = denotes tel/data.

“J” hook.

Symbols for Electrical Construction Drawings

NECA 100

11.0 Schematic and One-line Diagram Symbols Number

Preferred Symbol

11.001

Description C a p a c i t o r.

11.002

Circuit breaker (open). “xxAF” indicates frame size. “ y y AT ” i n d i c a t e s t r i p s i z e .

xxAF yyAT

11.003

Circuit breaker (enclosed). “xxAF indicates frame s i z e . “ y y AT ” i n d i c a t e s t r i p s i z e .

xxAF yyAT

11.004

P r i m a r y d r a w o u t t y p e c i r c u i t b r e a k e r. “ x x A F ” i n d i c a t e s f r a m e s i z e . “ y y AT ” i n d i c a t e s t r i p s i z e .

xxAF yyAT 11.005

L o w v o l t a g e d r a w o u t t y p e c i r c u i t b r e a k e r. “ x x A F ” i n d i c a t e s f r a m e s i z e . “ y y AT ” i n d i c a t e s t r i p s i z e .

xxAF yyAT

11.006 xxAF yyAT

zzA

Low voltage draw out type circuit breaker with current limiting fuses. “xxAF” indicates frame size. “yyAT” indicates trip size. “zzA” indicates fuse rating.

11.007

Contact, normally open (NO) (“TC”—with timed closing).

11.008

Contact, normally closed (NC). (“TO”—with timed opening).

CT

11.009

11.010

Current transformer cabinet.

Fused cutout. “zzA” indicates fuse rating.

zzA

11.011

Disconnect switch unfused.

11.012

zzA

11.013

Disconnect switch air break with fuse. “zzA” indicates fused rating. Fuse. “zzA” indicates fuse rating.

zzA

zzA

33

■

NECA 100

Symbols for Electrical Construction Drawings

11.0 Schematic and One-line Diagram Symbols Number

Preferred Symbol

Description

11.014

O v e r l o a d r e l a y.

11.015

Grounding connection—system and or equipment.

11.016

K2

11.017

Kirk key interlock system. “2”—indicates related kirk keys.

Lightning arrester and grounding to protect all phases.

3

11.018

M o t o r a n d l a b e l . “ 3 ” d e n o t e s h o r s e p o w e r.

xx-xx-x-x

MO

11.019

11.020

Motor operator for circuit breakers or switches.

N e t w o r k p r o t e c t o r.

PANEL Panelboard.

▼

11.021

11.022

11.023

Stress cone.

11.024

R e s i s t o r.

ST

11.025

11.026

34

Shunt trip.

Magnetic starter with NEMA size indicated.

1

■

Pothead.

Symbols for Electrical Construction Drawings

NECA 100

11.0 Schematic and One-line Diagram Symbols Number

Preferred Symbol

11.027

G r o u n d f a u l t c i r c u i t i n t e r r u p t e r, p e r s o n n e l p r o t e c tion.

GFCI

xxx KW xxxV-xø GENERATOR

G

▼

11.028

Description

xxx KVA xxxV xø xW PRI OOOO

G e n e r a t o r.

▼ Tx

OOOO

11.029

Tr a n s f o r m e r, d r y t y p e . U n l e s s o t h e r w i s e i n d i c a t e d .

xxxY/xxxV xø xW SEC

P o t e n t i a l t r a n s f o r m e r. “ 3 ” — i n d i c a t e s q u a n t i t y. (3) (3)

400-5A

OO

11.031

OO

11.030

C u r r e n t t r a n s f o r m e r. “ 3 ” — i n d i c a t e s q u a n t i t y, “ 4 0 0 5A” indicates ratio.

11.032

3-phase, 3-wire delta connection.

11.033

Corner grounded delta.

11.034

3-phase, 4-wire wye connection (grounded neutral).

11.035

AFD 3 xx-x-x

Adjustable frequency drive. 3 r e f e r e n c e s d e t a i l n u m b e r.

11.036

XX’ xxxV BUSDUCT

B u s d u c t o r b u s w a y.

11.037

XX’ xxxV WIREWAY

W i r e w a y.

35

■

NECA 100

Symbols for Electrical Construction Drawings

11.2 Schematic and One-line Diagram Symbols—Switches Number 11.201

Preferred Symbol N

E L

Tr a n s f e r s w i t c h .

11.202

Push button (start).

11.203

Push button (stop).

11.204

Limit switch.

11.205

Flow switch.

11.206

Pressure switch.

11.207

Float switch.

11.208

11.209

■

AUTO/MANUAL TRANSFER SWTICH xxA-xP

Description

38

R

P i l o t l i g h t . L e t t e r i n d i c a t e s c o l o r. E x a m p l e : R = r e d .

Solenoid.

Symbols for Electrical Construction Drawings

NECA 100

12.0 Miscellaneous Number

Preferred Symbol

Description

12.001

G

G r o u n d b a r. L e n g t h t o b e n o t e d .

12.002

AC

M e c h a n i c a l e q u i p m e n t t a g n u m b e r, r e f e r t o mechanical equipment schedule.

2

12.003

E q u i p m e n t t a g n u m b e r, r e f e r t o e q u i p m e n t s c h e d ule, “K”—indicates kitchen, “C”—indicates compute r.

K2

B

12.004

Note symbol, refer to note as indicated.

12.005

1

F e e d e r n u m b e r, r e f e r t o “ f e e d e r s c h e d u l e ” .

12.006

A

Ty p i c a l / s i m i l a r r o o m o r a r e a l a y o u t s y m b o l . “ A ” — indicates layout type.

12.007

A E–2

Ty p i c a l l a y o u t s y m b o l — r e f e r t o l a y o u t t y p e . “ A ” o n drawing E-2, circuits to be used are as indicated.

CKT/ P21–5,7

E–4

SCALE: N.T.S.

▼

12.009

DESCRIPTION

▼

2

12.008

B

E–2

12.010

2 E–4

D e t a i l h e a d e r, i n d i c a t i n g d e t a i l N o . 2 o n d r a w i n g E 4.

S e c t i o n i d e n t i f i e r, i n d i c a t i n g s e c t i o n “ B ” o n d r a w i n g E - 2 . L e f t o r r i g h t a r r o w.

D e t a i l i d e n t i f i e r, i n d i c a t i n g d e t a i l N o . 2 o n d r a w i n g E-4.

39

■

NECA 100

Symbols for Electrical Construction Drawings

13.0 Abbreviations Abbreviation

■

Description

Abbreviation

Description

1P

One pole

DIST

Distribution

2P

Two pole

DN

Down

3P

Three pole

DWG

Drawing

4P

Four pole

DT

Dusttight(*)

1P1W

One pole, one wire

E

Wired on emergency circuit

1P2W

One pole, two wire

EA

Each

2P2W

Two pole, two wire

EC

Electrical contractor

2P3W

Two pole, three wire

EF

Exhaust fan

3P2W

Three pole, two wire

ELEC

Electric(al)

3P3W

Three pole, three wire

EMER

Emergency

3P4W

Three pole, four wire

EMT

Electric metallic tubing

4P4W

Four pole, four wire

ENCL

Enclosure

A

Ampere

EOL

End of line

AC

Alternating current

EPO

Emergency power off

AF

AMP frame

EQUIP

Equipment

AFCI

Arc-fault circuit interrupter

EWC

Electric water cooler

AFF

Above finished floor

EWH

Electric water heater

AFG

Above finished grade

EXIST.

Existing

AHU

Air handling unit

F

Flush

AIC

Ampere interrupting capacity

FA

Fire alarm

AL

Aluminum

FBO

Furnished by others

AS

AMP switch

FC

Fire protection contractor

AT

AMP trip

FCU

Fan coil unit

ARCH

Architect

FDN

Foundation

ATS

Automatic transfer switch

FIXT

Fixture

AUD

Audiometer box connection

FLA

Full load amps

AUX

Auxiliary

FLEX

Flexible

A/V

Audio visual

FLR

Floor

AWG

American wire gauge

FMC

Flexible metallic conduit

BLDG

Building

FRE

Fiberglass reinforced epoxy conduit

C

Conduit (Generic term for raceway.

FURN

Furniture

Provide as specified.)

GC

General contractor

CAM

Camera

GEN

Generator

CAT

Catalog

GFCI

Ground fault circuit interrupter

CATV

Cable television

GFPE

Ground fault protection equipment

CB

Circuit breaker

GND

Grounded

CKT

Circuit

GRC

Galvanized rigid conduit

COL

Column

HGT

Height

C.T.

Current transformer

HP

Horsepower

CU

Copper

HV

High voltage

CL

Centerline

HVAC

Heating, ventilating and air

DC

Direct Current

conditioning

Delta

HW

Hot water

DET

Detector

Hz

Hertz (cycle) per second

DISC

Disconnect

IAM

Individual addressable module

40

Symbols for Electrical Construction Drawings

NECA 100

13.0 Abbreviations Abbreviation

Description

Abbreviation

Description

IC

Intercommunication

#

Number

ID

Identification

NTS

Not to scale

IG

Isolated ground

O2

Oxygen

IMC

Intermediate metal conduit

OHD

Overhead door operator

IPS

Interruptible power supply

P

Pole

IR

Passive infrared

PB

Pull box

JB

Junction box

PC

Plumbing system contractor

KCMIL

Thousand circular mils

PE

Primary service

K/O

Knock-out

PH ø

Phase

KVA

Kilovolt ampere

PNL

Panel(board)

KVAR

Kilovolt ampere reactive

PIV

Post indicating valve

KW

Kilowatt

PP

Power panel

LFMC

Liquidtight flexible metallic conduit

PR

Pair

LFNC

Liquidtight flexible nonmetallic conduit

PRI

Primary

LP

Lighting panelboard

PT

Potential transformer

LS

Limit switch

PVC

Polyvinyl chloride conduit

LTG

Lighting

PWR

Power

LV

Low voltage

RE

Remove existing

MAINT

Maintained

REC

Recessed

MAU

Make-up air unit

RECP

Receptacle

MAX

Maximum

REF

Roof exhaust fan

MC

Metal clad cable

RL

Relocate existing

MCB

Main circuit breaker

RM

Room

MCC

Motor control center

RMC

Rigid metal conduit

MD

Motorized damper

RT

Raintight(*)

MDP

Main distribution panel

RTU

Rooftop unit

MISC

Miscellaneous

RSC

Rigid steel conduit

MFR

Manufacturer

S

Surface mounted

MLO

Main lugs only

SCH

Schedule

MOD

Motor operated disconnect switch

SD

Smoke damper

MTD

Mounted

SE

Secondary electric service

MTG

Mounting

SEC

Secondary

MTS

Manual transfer switch

SIG

Signal

N

North

SN

Solid neutral

N/A

Not applicable

SP

Spare

NC

Normally closed

SPKR

Speaker

NEC

National Electrical Code

SPL

Splice

NF

Non-fused

SS

Stainless steel

NIC

Not in contract

STP

Shielded twisted pair

NL

Night light

STL

Carbon steel

NM

Nonmetallic sheathed cable

SUSP

Suspended

NO

Normally open

SW

Switch

NRTL

Nationally recognized testing lab

SWBD

Switchboard

(*) It is recommended that the appropriate NEMA designation be used in place of this abbreviation.

41

■

NECA 100

Symbols for Electrical Construction Drawings

13.0 Abbreviations Abbreviation

■

Description

Abbreviation

Description

SWGR

Switchgear

UTP

Unshielded twisted pair

TC

Telephone cabinet

V

Volt

TCI

Telecommunications cabling installer

VT

Vaportight(*)

TCP

Temperature control panel

Y

Wye

TEL/DATA

Telephone/data

W

Watt

TEL

Telephone

W/

With

TERM

Terminal(s)

WH

Watthour

TV

Television

WP

Weatherproof

TYP

Typical

WP

Weatherproof

UC

Under counter

WT

Watertight(*)

UG

Underground

XFMR

Transformer

UH

Unit heater

XP

Explosion proof(*)

U.O.I.

Unless otherwise indicated

ZAM

Zone adapter module

UPS

Uninterruptible power source

+72

UTIL

Utility

42

TEMP

Temporary

Mounting units to centerline above finished floor or grade

Annex B: Typical Risers, One-line Diagrams, and Schedules This annex provides examples of typical schedules, riser diagrams, and one-line diagrams that are included in electrical construction drawings. A given set of drawings will not necessarily include every typical example included here. This annex includes the following: Type

Page

Panel schedule . . . . . . . . . . . . . . . . . . . . . . . 49 Lighting fixture schedule . . . . . . . . . . . . . . . 50 Transformer schedule . . . . . . . . . . . . . . . . . 51 Mechanical equipment schedule. . . . . . . . . 52 Feeder schedule . . . . . . . . . . . . . . . . . . . . . . 53 Electrical one-line diagram . . . . . . . . . . . . . 54 Fire alarm riser . . . . . . . . . . . . . . . . . . . . . . . 55

■

48

49

■

Load (VA) Trip

10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39

Trip

Bkr. Frame

Modifications: __________________________

Load Name

Total VA: ________________________

Load (VA)

Amps RMS. Sym.: ________________________________

Phase C: _____________________

42

8

7

41

6

5

Ckt. No.

4

C

3

B 2

A

Mains: __________________________

Location: _______________________________________________

Wires: ___________

1

Ckt. No.

Phase B: _____________________

Bkr. Frame

Mfg./Type: ________________________

Phase A: _____________________

Load Name

Phase: _____________

Enclosure: __________________________

Voltage: ___________________

Mount: _______________________

Panel: _____________

Panel Schedule

■

50

Type

Manufacturer

Catalog No.

Description

Lighting Fixture Schedule

Mounting

Lamps

51

■

Designation

Manufacturer

Catalog Number KVA

ø

PRI. Volts

PRI. Conductor Size/No.

Transformer Schedule

Sec. Volts

Sec. Conductor Size/No.

Ground Conductor Size/No.

Mounting

■

52

Designation

Description

Quantity

Volt

ø

FLA

HP

KVA

Min. Wire Size/Type

Mechanical Equipment Schedule

Max. Fuse Size

Min. CCT Amps

Remarks/ Disconnect Type

Feeder Schedule # No.

No. Runs

No. Wires/Size

Insul.

CU/AL

Conduit

Origin

Termination

53

■

NECA 100

Symbols for Electrical Construction Drawings

Electrical One-Line Diagram

FROM 480V U N I T S U B S TAT I O N # 8 FROM EMERG. SWITCHGEAR 3EH01B6 N

3EHA1B6B 1200A 4 8 0 V, 3 W + G , 3 P 65,000A RMS SYM CLOSING A N D W I T H S TA N D R AT I N G

E L

EMERGENCY DISTRIBUTION SWITCHBOARD 3 E H 0 1 C 6 B , 1 2 0 0 A , 4 8 0 V, 3 Ø , 3 W + G , 6 5 , 0 0 0 I E R

800A

800A

600A

1

1200A

125A

150A

3

2

4

EMERGENCY DISTRIBUTION SWITCHBOARD 3 E H M 8 D 8 B , 8 0 0 A , 4 8 0 V, 3 Ø , 3 W + G , 6 5 , 0 0 0 I E R

800A

▼

OOOO OOOO

400A

240A

240A

9

3EHT185 7 5 K VA 480V 3Ø 3W PRI

120/208V 3Ø 4W SEC

3EHL1B5

4

11

10

250/M 5 AFD 36-2-2

1

AFD 32-5-2

2

RV N R 22,000 IER

800

240A

6

5

1

AFD 32-2-2

54

250

150

F-36-2-2

P-32-5-2

EMERGENCY DISTRIBUTION SWITCHBOARD 3 E H M 1 D 4 B , 8 0 0 A , 4 8 0 V, 3 Ø , 3 W + G , 6 5 , 0 0 0 I E R

300A

■

125

C-26-1-1

240A

S PA R E 3

AFD 32-2-4

600

EMERGENCY DISTRIBUTION SWITCHBOARD 3 E H M 1 D 4 D , 6 0 0 A , 4 8 0 V, 3 Ø , 3 W + G , 6 5 , 0 0 0 I E R

240A

240A

S PA R E

240A

8

7

1

AFD 32-2-8

150

125

125

EF-32-2-2

EF-32-2-4

EF-32-2-8

240A

S PA R E 3

AFD 32-2-10

125

EF-32-2-10

S PA R E