Planning & EstimatingQuestion 387 of 521
For a branch circuit, what maximum voltage drop does the NEC recommend for reasonable efficiency?
a.1%
b.10%
c.8%
d.3%
Explanation
An informational note recommends that branch-circuit voltage drop not exceed 3% (with a combined feeder-plus-branch limit of about 5%). This is a recommendation for efficiency, not an enforceable rule, and the larger values would cause excessive drop.
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