Journeyman Electrician’s Exam Journeyman Electrician's Branch Circuits 2

Question 1

What is the maximum load permitted on a 20-ampere branch circuit serving general lighting and receptacles?

Accepted Answer

16 amperes

Answer

NEC 210.19 limits continuous loads on a branch circuit to 80% of the circuit rating, so 20A × 0.80 = 16A maximum.

Question 2

A small appliance branch circuit in a kitchen must be rated at least:

Accepted Answer

20 amperes, 120 volts

Answer

NEC 210.11(C)(1) requires small appliance branch circuits to be 20-ampere, 120-volt circuits.

Question 3

Which NEC section governs the required number of branch circuits based on calculated load?

Accepted Answer

210.11

Answer

NEC 210.11 specifies the minimum number of branch circuits required based on calculated load.

Question 4

A multiwire branch circuit sharing a neutral must have the ungrounded conductors on:

Accepted Answer

Different phases or legs

Answer

NEC 210.4 requires multiwire branch circuit ungrounded conductors to be on different phases so the neutral carries only the unbalanced current.

Question 5

What is the minimum wire size required for a 20-ampere branch circuit using copper conductors?

Accepted Answer

12 AWG

Answer

NEC 210.19(A) requires 12 AWG copper as the minimum conductor size for a 20-ampere branch circuit.

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