Licensed Electrical Contractor FREE Licensed Electrical Contractor Services, Feeders, and Branch Circuits Questions and Answers 2

Question 1

According to the NEC, what is the minimum size conductor permitted for a 200-amp residential service entrance?

Accepted Answer

3/0 AWG copper

Answer

2/0 AWG copper

Answer

4/0 AWG copper

Answer

250 kcmil copper

Question 2

What is the maximum number of overcurrent devices permitted on a single panelboard in accordance with NEC Article 408?

Accepted Answer

42

Answer

30

Answer

48

Answer

No limit specified

Question 3

When calculating feeder demand load for a commercial kitchen, what demand factor applies to the first 12 kW of commercial electric cooking equipment per NEC Table 220.56?

Accepted Answer

65%

Answer

75%

Answer

80%

Answer

100%

Question 4

A multiwire branch circuit supplying line-to-neutral loads must be disconnected simultaneously by which means?

Accepted Answer

A multipole breaker or handle ties

Answer

Individual single-pole breakers

Answer

A separate disconnect switch only

Answer

Any listed overcurrent device

Question 5

What is the maximum continuous load permitted on a branch circuit breaker rated at 30 amperes?

Accepted Answer

24 amperes

Answer

20 amperes

Answer

27 amperes

Answer

30 amperes

Question 6

Per NEC 215.2(A)(1), feeder conductors must have an ampacity not less than required to supply the load as calculated in which parts of Article 220?

Accepted Answer

Parts I through V

Answer

Parts I and II only

Answer

Parts III, IV, and V

Answer

Parts II and III only