Commercial Load Calculations2 : NEC Code Questions
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Free Practice test on NEC code questions:: commercial load calculations – 2
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Question 1 of 8
1. Question
1 pointswhat is the calculated load of 5 work stations, which has 5 ft multi outlets ( not used simultaneously) and 3 ft multi outlets (used simultaneously)?
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Answer:
NEC 220.14
 Appliances unlikely used => use 180 VA per 5 ft section
 Appliances simultaneously => use 180 VA per 1 ft section
5 ft multi outlets => (( 5 * 5) / 5 ) * 180 = 900 VA
3ft multi outlets => ((3* 5)/1) * 180 = 2400 VA
= 3600 VA = 3.6 KVA

Question 2 of 8
2. Question
1 pointswhat is the receptacle calculated load for a 19000 sqft building which contains one hundred eighty 15A and 20 A , 120 V receptacles?
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Answer:
NEC 220.14 (1) The minimum receptacle load is 180 VA
so 180 receptacles load = 180 * 180 = 32,400.
Refer NEC Table 220.44
first 10000 VA at 100% = 10000 VA * 1 = 10000 VA
Remaining at 50% = 22,400 VA * 0.5 = 11,200 VA
Total load = 21,200 VA

Question 3 of 8
3. Question
1 pointsA sign outlet of an commercial occupancy accessible to pedestrians is a …………… as per NEC.
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Question 4 of 8
4. Question
1 pointsWhat is the minimum load for the required exterior sign or outline lighting for a commercial occupancy as per NEC?
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Refer NEC 220.14(F)
The minimum required load = 1200 VA

Question 5 of 8
5. Question
1 pointsFor electrical sign what is minimum feeder/service conductor calculated load?
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Refer NEC 220.14 (F)
The minimum load of electrical sign = 1200 VA
Refer NEC 215.2 (A)(1)
Service conductor for electric sign must be sized 125 % of continuous load.
Total load = 1200 * 1.25 = 1500 VA

Question 6 of 8
6. Question
1 pointsAn allelectric restaurant has a completed load 150 KVA connected to 120/208 V three phase supply. What is the required service conductor ampacity?
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Total connected load = 150 KVA
Refer: NEC Table 220.88
First 220 KVA at 80% so 150 KVA * 0.8 = 120 KVA
Total demand load = 120 KVA
ampacity = VA / [ E * 1.732 ] = 333 A

Question 7 of 8
7. Question
1 pointsWhat is grounded service conductor size required for allelectric restaurant (120 V / 208 V three phase) which has a total connected load of 200 KVA?
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Total connected load = 200 kva
Refer : NEC Table 220.88
First 200 kVA at 80% so 200 * 0.8 = 160 KVA
Total demand load = 160 KVA
Ampacity I = VA / E * 1.732 = 160,000 / ( 208 * 1.732) = 444 A
UNgrounded conductor if installed in parallel two raceway
444/2 = 222 A
Refer NEC Table 310.15(B)(16) 4/0 AWG rated at 230 A is suitable.

Question 8 of 8
8. Question
1 pointsThe primary rating of a motorgenerator arc welder is 30 A with a duty cycle of 30 percentage. What is the minimum size branch circuit conductor for the welder?
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The Branch circuit conductor rating should not be less than arc welder name plate rating. in case if it is not available it should not be less than primary current rating as adjusted by the multiplier in Table 630.11(A)
Demand load = Primary rating * Multipler
= 30 A * 0.62 = 18.6A
Refer NEC Table 310.15(B)(16)
12 AWG rated at 20A at 60^{0}C is suitable conductor.