Code Quiz: Identifying DC Branch Circuit Conductors

Jan. 23, 2014
NEC guidelines on how to identify DC branch circuit conductors

Fill in the blanks with the appropriate answer.

When identifying branch circuit conductors (6 AWG or smaller) of direct-current systems that are more than 50V, the ungrounded positive conductor shall be identified by a red outer finish, a continuous red stripe the entire length (on insulation color other than green, white, gray or black), or __________________. The ungrounded negative conductor shall be identified by a black outer finish, a continuous black stripe the entire length (on insulation color other than green, white, gray or black), or __________________.

A. imprinted “+” signs or the word “POSITIVE” or “POS”  / imprinted “-“ signs or the word “NEGATIVE” or” NEG”, as per 310.120(B)

B. blue with red stripe / yellow with black stripe

C. blue with black stripe / yellow with red stripe

D. white with red stripe / white with black stripe

Answer: A

Section 210.5(C)(2) has been added to the 2014 NEC. This new section applies only to branch circuits, not control or signaling circuits. For feeder circuit requirements, see 215.12(C)(2).

Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at [email protected].

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Steven Owen

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