NEC Questions Practice Test-12
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Question 1 of 9
1. Question
1 pointsIf a 115 volts load is connected to 120 v source. what is the minimum voltage that should be supplied to load as recommended by NEC?
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NEC recommended that the maximum voltage drop should be 5% for both branch circuit and feeder circuit.
120 * 0.05 = 6 volts
so minimum voltage supplied to load = 120 – 6 = 114 volts;
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Question 2 of 9
2. Question
1 pointsWhat is the receptacle calculated load for a 18000 square feet commercial property which contains one hundred twenty 15 A and 20 A 120 receptacles?
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Refer: NEC 220.14(1)
For each receptacle the minimum load is 180 VA
Total load = 120 * 180 = 21600 VA
Refer NEC Table 220.44
First 10,000 at 100 % = 10000 * 1 = 10000 VA
Remaining at 50% = 11600 * 0.5 = 5800 VA
Total Calculated Load = 15800 VA
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Question 3 of 9
3. Question
1 pointsIn no case the rating of short circuit ground fault protective device for a single motor compressor should not exceed ….. percentage of the motor.
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Refer : NEC 440.22 (A)
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Question 4 of 9
4. Question
1 pointsThe service disconnect for a mobile home should be located not less than …………. feet above platform.
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Refer : NEC 550.32(F)
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Question 5 of 9
5. Question
1 pointsWhat is the minimum feeder or service load for cloth dryers in a dwelling unit?
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Refer : NEC 220.54
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Question 6 of 9
6. Question
1 pointsA 4000 watts electric oven is connected to a 480 volts circuit. What is the resistance of heating element?
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P = E2 / R
R = P2 / E = (480 * 480 ) / 4000 = 57.6 ohms
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Question 7 of 9
7. Question
1 pointsIn a three phase balanced 4-wire system, the current in the neutral conductor ………………………….
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Question 8 of 9
8. Question
1 pointsWhich of the following conductors need over current protection on a residential electric service?
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Refer: NEC 240.15
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Question 9 of 9
9. Question
1 pointsIn class I Division 1 location, All fixed boxes and joints should be made …………..
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Refer : NEC 500.7 (A)