Licensed Electrical Contractor Services, Feeders, and Branch Circuits 5

Question 1

When applying the optional calculation method for a one-family dwelling per NEC 220.82, the first 10 kVA of total connected load is calculated at:

Accepted Answer

100%

Answer

NEC 220.82(B) requires the first 10 kVA of the total load to be calculated at 100% under the optional method.

Question 2

A 50-ampere branch circuit using copper conductors at 75°C rating requires a minimum conductor size of:

Accepted Answer

6 AWG

Answer

NEC Table 310.16 shows that 6 AWG copper at 75°C has an ampacity of 65 amperes, which is the minimum size for a 50-ampere circuit.

Question 3

Service lateral conductors installed underground are considered to be under the exclusive control of:

Accepted Answer

The serving utility

Answer

NEC 230.2 Informational Note clarifies that service laterals from the utility are typically under the utility's control.

Question 4

Per NEC 215.2, a feeder supplying a continuous load of 80 amperes and a non-continuous load of 20 amperes must have conductors with a minimum ampacity of:

Accepted Answer

120 amperes

Answer

80A × 125% + 20A × 100% = 100 + 20 = 120 amperes minimum conductor ampacity.

Question 5

Which NEC section requires a dedicated branch circuit for a household electric range?

Accepted Answer

210.19(A)(3)

Answer

NEC 210.19(A)(3) addresses branch circuit conductor sizing for household ranges and cooking appliances.

Licensed Electrical Contractor Practice Test

Licensed Electrical Contractor Practice Test

Licensed Electrical Contractor Services, Feeders, and Branch Circuits 5