NEC 2026 Compatible

An electrician is installing a new 15-ampere, 120-volt general-purpose branch circuit in a dwelling unit. The circuit is wired with 14 AWG THHN copper conductors, protected by a 15-ampere circuit breaker. The circuit supplies three 20-ampere rated duplex receptacles. What is wrong with this installation?

Journeyman Level📋 NEC 210.21(B)(3)Code Violations
A

The use of 14 AWG conductors for a general-purpose branch circuit is prohibited in dwelling units.

B

The 20-ampere rated receptacles are not permitted on a 15-ampere branch circuit.

C

THHN conductors are not suitable for dwelling unit wiring.

D

A 15-ampere circuit breaker is too small for a general-purpose dwelling unit circuit.

Explanation & Direct Citation

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    Code Violations Practice Question: NEC 210.21(B)(3) | SparkShift | SparkShift