NEC Code Questions Practice Test-5
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Question 1 of 10
1. Question
A single family dwelling unit has a connected load of 4000 VA. which of the following is the calculated demand load?
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Refer : NEC Table 220.42
First 3000 VA the demand factor is 100% = 3000 * 100 % = 3000 VA
remaining (4000-3000) = 1000 ( demand factor = 35%) = 1000 * 0.35 = 350 VA
total demand load = 3000 + 350 = 3350 VA -
Question 2 of 10
2. Question
What is the adjustment ampacity of a 3/0 THWN conductor at an ambient temperature of 1080F in wet location. The raceway contains four 3/0 THWN conductors in it.
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3/0 THWN conductor ampacity in wet location (750C) = 175 Amperes ( NEC 310.15(B)(16))
Ambient temperature correction factor at 1080F = 0.85 ( NEC 310.15(B)(2))
raceway conductor bundle adjustment factor for 4 conductors= 0.8 ( NEC 310.15(B)(3)(a))The conductor ampacity = 175 * 0.85 * 0.8 = 119 Amperes.
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Question 3 of 10
3. Question
In a dwelling unit has an electric heater rated at 5040 watts at 240 volts. What of the circuit breaker is used to protect the circuit?
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Rated current flow through heater = 5040/240 = 21 amperes
Because 21 is not a standard circuit breaker rating, next higher standard rating is 25 ampere.
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Question 4 of 10
4. Question
Which of the following locations type NM cable can be permitted to use?
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Refer : NEC 334.12
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Question 5 of 10
5. Question
In an underground service a bare neutral conductor can be buried in the ground with out any insulation.
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Refer: NEC 230.30
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Question 6 of 10
6. Question
When two or more single phase electric ranges are supplied by a 3 phase , 4 wire feeder, the total load computed is on the basis of ………………………….
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Refer : NEC 250.55
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Question 7 of 10
7. Question
What is the unit load per square foot in volt ampere for a restaurant?
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Refer: NEC Table 220.12
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Question 8 of 10
8. Question
What is permissible voltage drop in percentage for feeders at the farthest outlet of power heating and lighting loads?
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Refer: NEC 215.2(A) (4)
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Question 9 of 10
9. Question
At least one 15 or 20 ampere receptacle should be located within 50 feet of electrical service applies to outdoor service equipment.
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Question 10 of 10
10. Question
The overall length of the power supply cards for mobile homes shall not be less than ………… feet
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Refer : NEC 550.10(D)