NEC Questions Practice Test-11
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Question 1 of 9
1. Question
1 pointsWhat is the smallest aluminium size wire that can be used as service entrance conductors?
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Refer : NEC 230.31 (B)
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Question 2 of 9
2. Question
1 pointsWhat should be electrical fuse size to protect 10 AWG conductor?
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Refer : NEC 240.4 ( B)
The fuse size must not exceed the conductor rating
Refer : NEC 310.15(B)(16)
10 AWG allowable maximum ampacity is 30 amperes, so 30 amperes fuse is suitable to protect the 10 AWG conductor.
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Question 3 of 9
3. Question
1 pointsFor equipment’s installed in class I location, which of the following type of bonding is required?
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Refer: NEC 501.30
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Question 4 of 9
4. Question
1 pointsA 230 volts source is connected 240 volts source. what is the minimum NEC recommended voltage for that load?
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NEC recommends that the maximum voltage drop for both feeder and branch conductor is 5%
240 * 0.05 = 12 volts
240 – 12= 228 volts
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Question 5 of 9
5. Question
1 pointsWhat is the calculated load for 3 work stations which has 5 feet multi outlets not simultaneously used and 2feet multi outlets which are used simultaneously?
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Refer : NEC 220.14 (H)
-> appliances not simultaneously used => use 180 VA for 5 feet section
-> appliances simultaneously used => use 180 VA for 1 feet section.
3 * 5 = 15/5 = 3 sections * 180 = 540 VA
3 * 2 = 6 * 180 = 1080 VA
= 1620 VA
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Question 6 of 9
6. Question
1 pointsWhat is the minimum operating rating of short circuit ground fault protective device that can be used for individual motor-compressor?
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Refer : NEC 440.22(A)
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Question 7 of 9
7. Question
1 pointsWhat is the minimum tap conductor ampacity which supply 30 A industrial heating appliances?
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Refer : NEC 210.19(A)(4)
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Question 8 of 9
8. Question
1 pointsIn a single family dwelling unit what is the minimum allowable rating of a 3 wire service conductors?
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Incorrect
Refer: NEC 230.42(C)
un-grounded conductors for specific installations not to be less than service disconnecting means.
Refer : NEC 230.79 (C)
Disconnecting means for a single family dwelling unit must not be less than 100 A
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Question 9 of 9
9. Question
1 pointsone 6 AWG THHN conductor is good for how many KW at 240 volts?
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Wattage = E * I
E = 240 volts
Refer NEC Table 310.15(B)(16)
for 6 AWG THHN conductor allowable ampacity is 65 A
wattage = 240 * 65 = 15600 watts = 15.6 KW