Service Entrance, Feeder and Branch Circuit calculations 1
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Free online practice test on NEC code Questions (Branch Circuits)
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Question 1 of 10
1. Question
1 pointsMultiwire branch circuits shall supply only line to neutral loads.
Correct
Incorrect
Refer : NEC 210.4 C
It can be used to supply one utilization equipment (Exception1) 
Question 2 of 10
2. Question
1 pointsWhat is the maximum voltage applied to branch circuits that are connected to luminaries in dwelling unit?
Correct
Incorrect
Refer : NEC 210.6 A

Question 3 of 10
3. Question
1 pointsThe 30 amp branch circuit provided for laundry outlet shall not have any other outlet.
Correct
Incorrect
Refer: NEC 210.11 (C )(2)
It is not 30 amp branch circuit, it is 20 amp branch circuit.

Question 4 of 10
4. Question
1 pointsWhich of the following is the amperage of the branch circuit additionally required for bathroom outlets?
Correct
Incorrect
Refer : NEC 210.11 (C)(3)

Question 5 of 10
5. Question
1 pointsWhich of the following is the minimum branch circuit size operated at 480 volts and with out any correction factors?
Correct
Incorrect
Refer : NEC 210.19 (A) (1)

Question 6 of 10
6. Question
1 pointsWhich of the following is the minimum branch circuit rating that will be used for house hold appliances where the load is 10 KW?
Correct
Incorrect
Refer : NEC 210.19 (A) (3)

Question 7 of 10
7. Question
1 pointsWhat are the minimum heavy duty lamp holders that are permitted on 20 ampere branch circuit operated at 120 volts?
Correct
Incorrect
Refer: NEC 220.21(A)
Minimum heavy duty lamp holder rating is 600 volt amperes.
Refer : NEC 210.19 1
As the load is continuous ,The minimum branch circuit rating = 600 * 1.25 = 725 amperes
Total voltampere rating of 120 volts 20 ampere branch circuit = 120 * 20 = 2400 voltampere
The minimum number permitted per branch circuit is 2400 / 725 = 3.2 = 3. 
Question 8 of 10
8. Question
1 pointsThe lamp holder connected to a 30 amp branch circuit must be of heavyduty type.
Correct
Refer: 210.21 (A)
Incorrect

Question 9 of 10
9. Question
1 pointsA utilization equipment connected by cord and plug type shall not exceed …………….. percentage of branch circuit rating.
Correct
Incorrect
Refer : NEC 210.23 C

Question 10 of 10
10. Question
1 pointsIf a feeder conductor is supplying only transformers, which of the following is the ampere rating of feeder conductor?
Correct
Incorrect
Refer : NEC 215 (B) (1)