Fill in the blank. When sizing the neutral conductor of a solidly grounded system operating over 1,000V, the ampacity of the neutral conductor shall be of sufficient ampacity for the load imposed on the neutral conductor, but not less than ____ of the phase conductors. Note: Exclude any Exception(s).
A) 25%
B) 33.33%
C) 50%
D) 80%
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Answer: B
As outlined in Sec. 250.184(A)(2), the neutral conductor a solidly grounded system operating over 1,000V “shall be of sufficient ampacity for the load imposed on the conductor, but not less than 33.33% of the ampacity of the phase conductors.” This excludes any exception(s).
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].
