NEC Questions Practice Test13
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Question 1 of 10
1. Question
1 pointsWhich of the following following locations , easily ignitable fibers / flyings are stored?
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Incorrect
Refer : NEC 500.5(D)(2)

Question 2 of 10
2. Question
1 pointsWhat is the minimum size electrical service is required for a single family dwelling unit?
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Refer NEC 230.79(C)
The minimum electrical service required for a single family dwelling unit is 100 amperes.

Question 3 of 10
3. Question
1 pointsWhat must be the electrical fuse rating to protect 12 AWG Branch conductor?
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Refer : NEC 240.4 (D)
the fuse size must not exceed the conductor rating.
Refer : NEC Table 310.15(B)(C)
12 AWG maximum allowable ampacity is 20 amperes

Question 4 of 10
4. Question
1 pointsA sign outlet of an commercial occupancy accessible to pedestrians is a …………………….. load
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Question 5 of 10
5. Question
1 pointsWhat is the minimum feeder/service conductor calculated load for an electrical sign?
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Refer: NEC 220.14(F)
The minimum load for an electrical sign = 12000 VA
Refer : NEC 215.2(A)(1)
service conductor for electrical sign must be sized 125% of continuous load
12000 * 1.25 = 15000 VA

Question 6 of 10
6. Question
1 pointsWhat is the minimum ampere rating of short circuit ground fault protective device that can be used for individual motorcompressor?
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Refer : NEC 440.22(A) exception

Question 7 of 10
7. Question
1 pointsAn industrial heating appliances rated at 40 A is supplied by a tap conductor. what should be the minimum tap conductor ampacity?
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Refer: NEC 210.19(A)(4)

Question 8 of 10
8. Question
1 pointsIf a single dwelling family unit consists of one air conditioning unit rated at 4 KW and fixed heating equipment rated at 3 KW. What is the total dwelling unit calculated load?
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Refer : NEC 220.60
Both air conditioning and heating equipment will not operate simultaneously , the smaller of the two loads can be omitted. Total calculated load = 4 KW

Question 9 of 10
9. Question
1 pointsA 4000 watts electric oven is connected to 480 volts electric circuit. what is the resistance of heating element?
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Resistance = R = E^{2} / P = (480 * 480 ) / 4000 = 57.6 ohms

Question 10 of 10
10. Question
1 pointsWhat is the maximum rating of panel boards containing 30 ampere or less snap switches?
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Refer : NEC 408.36(A)