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

NEC 310.10(G) requires that each parallel conductor be 1/0 AWG or larger.

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

NEC Table 220.55 Column C permits an 8 kW maximum demand for a single household range rated up to 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

NEC 210.6(C) permits up to 300 volts on branch circuits supplying mogul-base lampholders.

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

NEC 240.21(B)(2) requires 25-foot feeder tap conductors to have an ampacity of at least one-third of the rating of the feeder overcurrent device.

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

NEC 230.42(A) requires service entrance conductors to be sized per the load calculations in Article 220.

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