Branch Circuit Practice Test Questions – 2 ( NEC Code)
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Question 1 of 10
1. 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 2 of 10
2. Question
1 pointsWhat is the minimum tap conductor ampacity which supply 30 amperes industrial heating appliance?
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Refer : NEC 210.19 (A)(4)
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Question 3 of 10
3. Question
1 pointsAn industrial heating appliance rated at 45 A is supplied by a tap conductor. what should be the minimum tap conductor ampacity?
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Incorrect
Refer : NEC 210.19(A)(4)
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Question 4 of 10
4. Question
1 pointsA 2400 watts electric motor is connected to 240 volts single phase supply 2 wire circuit. What is the minimum size TW conductor that is required to carry the load?
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Current = P /E = 2400 / 240 = 10 amperes
Refer: NEC 424.3 (B)
Motor should be considered as continuous load
Refer : NEC 210.20(A)
Over current device should be 125% of continuous loads
over current device rating = 10 * 1.25 = 12.5 amperes
Refer: NEC 310.15 (B)(16)
14 AWG is suitable conductor
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Question 5 of 10
5. Question
1 pointsWhat should be the maximum percentage of cross sectional area of a conduit that should be occupied when three or more THW conductors are placed in a circuit.
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Refer : NEC Chapter 9 Table 1
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Question 6 of 10
6. Question
1 pointsOn a 25 ampere branch circuit what is the minimum size THW conductor that can be used?
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Refer : NEC Table 310.15(B)(16)
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Question 7 of 10
7. Question
1 pointsIf the branch circuit rating is more than …………. , the lamp holders connected to it should be of the heavy duty type.
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Refer : NEC 210.21(A)
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Question 8 of 10
8. Question
1 pointsWhat is the maximum continuous load that can be connected to 240 volts 20 ampere branch circuit?
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Refer : NEC 210.20
The continuous load should have conductors rated 125 % above the connected load.
The maximum permitted load = 20 / 1.25 = 16 amperes
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Question 9 of 10
9. Question
1 pointsA 30 amperes branch circuit is permitted to supply fixed lightening units in ………………
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Refer : NEC 210.23 ( B)
30 ampere branch circuit is permitted to supply fixed lighting unit in other than dwelling unit with heavy duty lamp holders
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Question 10 of 10
10. Question
1 pointsWhat will the branch circuit calculated load for a single 12 KW electric range in a dwelling unit?
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Refer : NEC Table 220.55
When sizing branch circuits or feeders, the electric range rated not greater than 12 KW should be taken as 8 KW