NEC Questions Practice Test – 7
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Free online Practice Test on NEC Code questions – 7
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Question 1 of 10
1. Question
1 pointsWhen two different size conductor wires are connected in series, the maximum fuse rating should be used is one that protects …………….
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Question 2 of 10
2. Question
1 pointsWhat percentage of rated ampacity is allowed for each conductor when eight current carrying conductors are equipped in flexible cords?
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Refer: NEC Table 400.5(A)(3)
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Question 3 of 10
3. Question
1 pointsThe conductor amapcity is 150 amperes. What is the maximum allowed conductor ampacity of each conductor if 5 of those conductors are placed in flexible cord?
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Refer: NEC Table 400.5 (A)(3)
For 5 conductors in flexible cord allowed ampacity percentage = 80 % of rated amapcity
Allowed amapcity of each conductor with 150 Ampere rating = 150 * 0.8 = 120 amperes. -
Question 4 of 10
4. Question
1 pointsUpto what minimum height the underground conductors must be given mechanical protection if they carried up a pole?
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Refer: NEC 300.5(C)(1)
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Question 5 of 10
5. Question
1 pointsWhat is the maximum demand for eight wall-mounted ovens, house hold electric ranges and other house hold cooking appliances rated at over 1 ¾ KW each?
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NEC Table 220.55
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Question 6 of 10
6. Question
1 pointsWhat is minimum ampere rating of a heavy duty lighting track?
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Refer: NEC 410.153
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Question 7 of 10
7. Question
1 pointsWhich of the following is the ampacity of 4 AWG SE cable?
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Refer: NEC 338.10(B)
SE cable ampacity is based on 600C
Refer : NEC Table 310.15(B)(16)
4 AWG — 70 A -
Question 8 of 10
8. Question
1 pointsEquipment grounding conductors can be considered as current carrying conductors in some cases?
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Refer: NEC 310.15(B)(5)
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Question 9 of 10
9. Question
1 pointsWhat is the demand factor in percentage for a non-dwelling unit with a receptacle load of 15 kVA?
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Refer : NEC Table 220.44
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Question 10 of 10
10. Question
1 pointsAt one end of the feeder the voltmeter reads 240 volts. What is minimum reading voltage in volt-meter at the outlet of lighting loads?
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Refer: NEC 215.2(A) (4)
The maximum voltage drop in feeder is 3 %
the voltmeter reading = 240 – 0.03 * 240 = 240 – 7.2 = 232.8 volts