Wiring Design & Calculations
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WIRING DESIGN & CALCULATIONS
1 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Outline I. Summary of Branch – Circuit Requirements II. Dimensions and Areas of Conduit and Tubing III. Computations for Service Entrance Conductors and Service Equipment IV. Sizing of Grounding Electrode Conductors (GEC) and Equipment Grounding Conductors (EGC) V. Sample of Wiring Design & Calculations 2 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
SUMMARY OF BRANCH CIRCUIT REQUIREMENTS
3 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Summary of Branch Circuit Requirements Circuit Rating Conductors (min. size): Circuit Wires 1 Taps Fixtures wires and cords – see 2.40.1.5 Overcurrent Protection Outlet devices: Lampholders permitted Receptacle rating 2
15 A
20 A
30 A
40 A
50 A
2.0 (1.6) 2.0 (1.6)
3.5 (2.6) 2.0 (1.6)
5.5 (2.6) 2.0 (1.6)
8.0 (3.2) 3.5 (2.0)
14 3.5 (2.0)
15 A
20 A
30 A
40 A
50 A
Heavy duty 40 or 50 A
Heavy duty 50 A
Any type 15 max. A
Any type 15 or 20 A
Heavy duty 30 A
Overcurrent Protection
15 A
20 A
30 A
40 A
50 A
Permissible load
See 2.10.2.5 (a)
See 2.10.2.5 (a)
See 2.10.2.5 (b)
See 2.10.2.5 (c)
See 2.10.2.5 (c)
1
These gauges are for copper conductors
2
4 For receptacle rating of cord-connected electric – discharge luminaries (lighting fixtures), see 4.10.6.9 (c)
RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
DIMENSIONS AND AREAS OF CONDUIT AND TUBING
5 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Dimensions and Areas of Conduit and Tubing
6 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Dimensions and Areas of Conduit and Tubing
7 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Dimensions and Areas of Conduit and Tubing
8 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Dimensions and Areas of Conduit and Tubing
9 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Dimensions and Areas of Conduit and Tubing
10 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Dimensions and Areas of Conduit and Tubing
11 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
12 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Dimensions and Areas of Conduit and Tubing Examples: 1. What is the cross sectional area of a 50 mm Intermediate Metal Conduit? a. 1964 mm2 c. 2005 mm2 b. 1950 mm2 d. 1926 mm2 2. What size of PVC schedule 40 is required for the following conductors? 10-3.5 mm2 THW + 12-5.5mm2 TW + 6-8mm2 THHN + 8-14mm2 THWN a. 40 mm c. 65 mm b. 50 mm d. 80 mm 3. What size Rigid Metal Conduit conduit is required for the following conductors? 6-3.5 mm2 TW + 8-5.5mm2 THHN + 6-8mm2 THWN + 4-14mm2 THW a. 20 mm c. 32 mm b. 25 mm d. 40 mm 13 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Dimensions and Areas of Conduit and Tubing Examples: 4. A 50mm rigid steel conduit has 10 - 8.0 mm sq THW wire in it. How many more no.8.0 wire can be put inside it? __________ a. 12 wires c. 14 wires b. 13 wires d. 15 wires 5. How many 5.5 mm2 TW copper conductor can be installed in a 40 mm x 6100 mm Electrical Nonmetallic Tubing. a. 29 wires c. 33 wires b. 31 wires d. 35 wires 6. What sized rigid Electrical Metallic Tubing is required for eight 14mm2 XHHW conductors? a. 20 mm c. 32 mm b. 25 mm d. 40 mm 14 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
COMPUTATIONS FOR SERVICE ENTRANCE CONDUCTORS AND SERVICE EQUIPMENT 15 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Allowable Ampacities of Insulated Conductors Rated 0 Through 2000 Volts, 60°C Through 90°C. Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth (Directly Buried), Based on Ambient Temperature of 30°C.
16 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Ampacity Derating – due to environmental condition the conductors are exposed
17 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1
18 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
19 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Examples: 1. The ampacity of a copper 5.5 mm2 THWN-2 is ________ when there are three conductors in the conduit and the ambient temperature is 70°F. Answer: 41.6 Amperes 2. The ampacity of a 2.0 mm2 THW conductors, when there are six conductors in a conduit and the temperature is 30°C, would be ______ amps. Answer: 16 Amperes 3. 24- 3.5 mm2 THW current- carrying conductors are installed in a conduit 450 mm in length. What is the total derating percent of value? Answer: No derating required 4. What is the allowable ampacity of a 5.5 mm2 TW copper conductor in an ambient temperature of 70°F? Answer: 32.4 Amperes 20 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
21 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
22 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
23 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
24 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Service Entrance Conductors Iwire = ∑total full load current + 25% IHRM wherein: Iwire - ampere rating of the conductor (A), refer to Table 3.10.1.16 IHRM – full-load current of highest-rated motor (A), refer to Table 4.30.14.2-4 Example: Determine the minimum size service entrance conductors to supply a 50 A lighting and appliance loads, and three-phase squirrelcage induction motors rated 230 volts, 90% pf one 50-Hp rated at 130A at full load and three 10Hp motors rated at 28A at full-load on a 230 Volts, 3-phase, 80% pf. a. 297 A
b. 264 A
RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
c. 208
d. 334 A
25
Philippine Electrical Code Part 1 Service Equipment ICB = ∑ (total full load current) + 150% IHRM wherein: Iwire - ampere rating of the conductor (A), refer to Table 3.10.1.16 IHRM – full-load current of highest-rated motor (A), refer to Table 4.30.14.2-4 Example: Determine the maximum rating of service equipment that will supply a 50 A lighting and appliance loads, and three-phase squirrelcage induction motors rated 230 volts, 90% pf of one 50-Hp rated at 130A at full load and three 10Hp motors rated at 28A at full-load on a 230 Volts, 3-phase, 80% pf. a. 477 A
b. 513 A
RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
c. 493 A
d. 450 A
26
SIZE OF GROUNDING ELECTRODE CONDUCTOR AND GROUNDING EQUIPMENT CONDUCTOR
27 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
28 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
29 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
WIRING DESIGN
30 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Wiring Design Example # 1: Single Family Dwelling Unit, Up to 150 Square Meters Floor Area. (Not More than Six Circuits) The dwelling unit has a floor area of 145 sq.m. It has a typical household appliances including one 1.5 Hp room air-conditioning unit. For Service Entrance Conductors – use THW wires (750) For Service Equipment – use (a) Nontime Delay Fuse and (b) Inverse Time Circuit Breaker
31 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Wiring Design Example # 2: Single Family Dwelling Unit, Up to 150 Square Meters Floor Area. (More than Six Circuits) The dwelling unit has a floor area of 145 sq.m. It has a typical household appliances including one 8-kW electric range, two-1 Hp room airconditioning unit, one 1.5-Hp room air-conditioning unit, and 1-Hp water pump. For Service Entrance Conductors – use THW wires (750) For Service Equipment – use (a) Nontime Delay Fuse and (b) Inverse Time Circuit Breaker
32 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Wiring Design Example # 3: Single Family Dwelling Unit, Up to 150 Square Meters Floor Area. Optional Calculation The dwelling unit has a floor area of 145 sq.m. It has a typical household appliances including one 8-kW electric range, two-1 Hp room airconditioning unit, one 1.5-Hp room air-conditioning unit, and 1-Hp water pump. For Service Entrance Conductors – use THW wires (750) For Service Equipment – use (a) Nontime Delay Fuse and (b) Inverse Time Circuit Breaker
33 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Wiring Design Example # 4: Single Family Dwelling Unit, More than 150 Square Meters Floor Area. 230 Volts Single Phase Service The dwelling unit has a floor area of 250 sq.m. It has a typical household appliances including two 6 kVA package type air-conditioning units, six 1.5 Hp room air conditioning units, two 4-kW wall mounted ovens, one 1.5 kW microwave oven, one 12-kW electric range, one 8-kW electric range, one 5-kW clothes dryer, four 5-kW water heaters, and one 1.5-Hp water pump. For Service Entrance Conductors – use THW wires (750) For Service Equipment – use (a) Nontime Delay Fuse and (b) Inverse Time Circuit Breaker 34 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Wiring Design Exercise: Single Family Dwelling Unit, Up to 150 Square Meters Floor Area. (More than Six Circuits) The dwelling unit has a floor area of 130 sq.m. It has a typical household appliances including one 8-kW electric range, 4500 Watts (VA) electric clothes dryer,one-1 Hp room air-conditioning unit, two ¾ Hp room airconditioning unit, and 1-Hp water pump. For Service Entrance Conductors – use THW wires (750) For Service Equipment – use (a) Nontime Delay Fuse and (b) Inverse Time Circuit Breaker
35 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
WIRING DESIGN & CALCULATIONS
36 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
1 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Outline I. Summary of Branch – Circuit Requirements II. Dimensions and Areas of Conduit and Tubing III. Computations for Service Entrance Conductors and Service Equipment IV. Sizing of Grounding Electrode Conductors (GEC) and Equipment Grounding Conductors (EGC) V. Sample of Wiring Design & Calculations 2 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
SUMMARY OF BRANCH CIRCUIT REQUIREMENTS
3 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Summary of Branch Circuit Requirements Circuit Rating Conductors (min. size): Circuit Wires 1 Taps Fixtures wires and cords – see 2.40.1.5 Overcurrent Protection Outlet devices: Lampholders permitted Receptacle rating 2
15 A
20 A
30 A
40 A
50 A
2.0 (1.6) 2.0 (1.6)
3.5 (2.6) 2.0 (1.6)
5.5 (2.6) 2.0 (1.6)
8.0 (3.2) 3.5 (2.0)
14 3.5 (2.0)
15 A
20 A
30 A
40 A
50 A
Heavy duty 40 or 50 A
Heavy duty 50 A
Any type 15 max. A
Any type 15 or 20 A
Heavy duty 30 A
Overcurrent Protection
15 A
20 A
30 A
40 A
50 A
Permissible load
See 2.10.2.5 (a)
See 2.10.2.5 (a)
See 2.10.2.5 (b)
See 2.10.2.5 (c)
See 2.10.2.5 (c)
1
These gauges are for copper conductors
2
4 For receptacle rating of cord-connected electric – discharge luminaries (lighting fixtures), see 4.10.6.9 (c)
RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
DIMENSIONS AND AREAS OF CONDUIT AND TUBING
5 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Dimensions and Areas of Conduit and Tubing
6 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Dimensions and Areas of Conduit and Tubing
7 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Dimensions and Areas of Conduit and Tubing
8 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Dimensions and Areas of Conduit and Tubing
9 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Dimensions and Areas of Conduit and Tubing
10 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Dimensions and Areas of Conduit and Tubing
11 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
12 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Dimensions and Areas of Conduit and Tubing Examples: 1. What is the cross sectional area of a 50 mm Intermediate Metal Conduit? a. 1964 mm2 c. 2005 mm2 b. 1950 mm2 d. 1926 mm2 2. What size of PVC schedule 40 is required for the following conductors? 10-3.5 mm2 THW + 12-5.5mm2 TW + 6-8mm2 THHN + 8-14mm2 THWN a. 40 mm c. 65 mm b. 50 mm d. 80 mm 3. What size Rigid Metal Conduit conduit is required for the following conductors? 6-3.5 mm2 TW + 8-5.5mm2 THHN + 6-8mm2 THWN + 4-14mm2 THW a. 20 mm c. 32 mm b. 25 mm d. 40 mm 13 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Dimensions and Areas of Conduit and Tubing Examples: 4. A 50mm rigid steel conduit has 10 - 8.0 mm sq THW wire in it. How many more no.8.0 wire can be put inside it? __________ a. 12 wires c. 14 wires b. 13 wires d. 15 wires 5. How many 5.5 mm2 TW copper conductor can be installed in a 40 mm x 6100 mm Electrical Nonmetallic Tubing. a. 29 wires c. 33 wires b. 31 wires d. 35 wires 6. What sized rigid Electrical Metallic Tubing is required for eight 14mm2 XHHW conductors? a. 20 mm c. 32 mm b. 25 mm d. 40 mm 14 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
COMPUTATIONS FOR SERVICE ENTRANCE CONDUCTORS AND SERVICE EQUIPMENT 15 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Allowable Ampacities of Insulated Conductors Rated 0 Through 2000 Volts, 60°C Through 90°C. Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth (Directly Buried), Based on Ambient Temperature of 30°C.
16 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Ampacity Derating – due to environmental condition the conductors are exposed
17 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1
18 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
19 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Examples: 1. The ampacity of a copper 5.5 mm2 THWN-2 is ________ when there are three conductors in the conduit and the ambient temperature is 70°F. Answer: 41.6 Amperes 2. The ampacity of a 2.0 mm2 THW conductors, when there are six conductors in a conduit and the temperature is 30°C, would be ______ amps. Answer: 16 Amperes 3. 24- 3.5 mm2 THW current- carrying conductors are installed in a conduit 450 mm in length. What is the total derating percent of value? Answer: No derating required 4. What is the allowable ampacity of a 5.5 mm2 TW copper conductor in an ambient temperature of 70°F? Answer: 32.4 Amperes 20 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
21 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
22 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
23 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
24 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Service Entrance Conductors Iwire = ∑total full load current + 25% IHRM wherein: Iwire - ampere rating of the conductor (A), refer to Table 3.10.1.16 IHRM – full-load current of highest-rated motor (A), refer to Table 4.30.14.2-4 Example: Determine the minimum size service entrance conductors to supply a 50 A lighting and appliance loads, and three-phase squirrelcage induction motors rated 230 volts, 90% pf one 50-Hp rated at 130A at full load and three 10Hp motors rated at 28A at full-load on a 230 Volts, 3-phase, 80% pf. a. 297 A
b. 264 A
RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
c. 208
d. 334 A
25
Philippine Electrical Code Part 1 Service Equipment ICB = ∑ (total full load current) + 150% IHRM wherein: Iwire - ampere rating of the conductor (A), refer to Table 3.10.1.16 IHRM – full-load current of highest-rated motor (A), refer to Table 4.30.14.2-4 Example: Determine the maximum rating of service equipment that will supply a 50 A lighting and appliance loads, and three-phase squirrelcage induction motors rated 230 volts, 90% pf of one 50-Hp rated at 130A at full load and three 10Hp motors rated at 28A at full-load on a 230 Volts, 3-phase, 80% pf. a. 477 A
b. 513 A
RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
c. 493 A
d. 450 A
26
SIZE OF GROUNDING ELECTRODE CONDUCTOR AND GROUNDING EQUIPMENT CONDUCTOR
27 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
28 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
29 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
WIRING DESIGN
30 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Wiring Design Example # 1: Single Family Dwelling Unit, Up to 150 Square Meters Floor Area. (Not More than Six Circuits) The dwelling unit has a floor area of 145 sq.m. It has a typical household appliances including one 1.5 Hp room air-conditioning unit. For Service Entrance Conductors – use THW wires (750) For Service Equipment – use (a) Nontime Delay Fuse and (b) Inverse Time Circuit Breaker
31 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Wiring Design Example # 2: Single Family Dwelling Unit, Up to 150 Square Meters Floor Area. (More than Six Circuits) The dwelling unit has a floor area of 145 sq.m. It has a typical household appliances including one 8-kW electric range, two-1 Hp room airconditioning unit, one 1.5-Hp room air-conditioning unit, and 1-Hp water pump. For Service Entrance Conductors – use THW wires (750) For Service Equipment – use (a) Nontime Delay Fuse and (b) Inverse Time Circuit Breaker
32 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Wiring Design Example # 3: Single Family Dwelling Unit, Up to 150 Square Meters Floor Area. Optional Calculation The dwelling unit has a floor area of 145 sq.m. It has a typical household appliances including one 8-kW electric range, two-1 Hp room airconditioning unit, one 1.5-Hp room air-conditioning unit, and 1-Hp water pump. For Service Entrance Conductors – use THW wires (750) For Service Equipment – use (a) Nontime Delay Fuse and (b) Inverse Time Circuit Breaker
33 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Wiring Design Example # 4: Single Family Dwelling Unit, More than 150 Square Meters Floor Area. 230 Volts Single Phase Service The dwelling unit has a floor area of 250 sq.m. It has a typical household appliances including two 6 kVA package type air-conditioning units, six 1.5 Hp room air conditioning units, two 4-kW wall mounted ovens, one 1.5 kW microwave oven, one 12-kW electric range, one 8-kW electric range, one 5-kW clothes dryer, four 5-kW water heaters, and one 1.5-Hp water pump. For Service Entrance Conductors – use THW wires (750) For Service Equipment – use (a) Nontime Delay Fuse and (b) Inverse Time Circuit Breaker 34 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
Philippine Electrical Code Part 1 Wiring Design Exercise: Single Family Dwelling Unit, Up to 150 Square Meters Floor Area. (More than Six Circuits) The dwelling unit has a floor area of 130 sq.m. It has a typical household appliances including one 8-kW electric range, 4500 Watts (VA) electric clothes dryer,one-1 Hp room air-conditioning unit, two ¾ Hp room airconditioning unit, and 1-Hp water pump. For Service Entrance Conductors – use THW wires (750) For Service Equipment – use (a) Nontime Delay Fuse and (b) Inverse Time Circuit Breaker
35 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
WIRING DESIGN & CALCULATIONS
36 RME Seminar / Wiring Design Calculations/ January 28, 2012 / Rev.00
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