Licensed Electrical Contractor FREE Licensed Electrical Contractor Services, Feeders, and Branch Circuits Questions and Answers 3

Question 1

When service entrance conductors are installed in parallel, what is the minimum size permitted per NEC 310.10(G)?

Accepted Answer

1/0 AWG

Answer

2/0 AWG

Answer

3/0 AWG

Answer

4/0 AWG

Question 2

For a dwelling unit with 240-volt electric range rated at 12 kW, what is the maximum demand load permitted per NEC Table 220.55 Column C?

Accepted Answer

8 kW

Answer

6 kW

Answer

9.6 kW

Answer

12 kW

Question 3

What is the maximum voltage permitted for branch circuits supplying lampholders of the mogul-base type per NEC 210.6?

Accepted Answer

300 volts

Answer

120 volts

Answer

150 volts

Answer

277 volts

Question 4

A feeder tap conductor not over 25 feet long must have an ampacity of at least what percentage of the feeder overcurrent device rating per NEC 240.21(B)(2)?

Accepted Answer

One-third

Answer

One-tenth

Answer

One-eighth

Answer

One-half

Question 5

Per NEC 230.42, service entrance conductors must have sufficient ampacity to carry the current for the load as determined by which article?

Accepted Answer

Article 220

Answer

Article 210

Answer

Article 215

Answer

Article 225

Question 6

What is the minimum rating required for any branch circuit that supplies two or more outlets or receptacles per NEC 210.3?

Accepted Answer

15 amperes

Answer

20 amperes

Answer

25 amperes

Answer

30 amperes