Branch Circuits & WiringQuestion 175 of 521
Under 240.4(D), what is the maximum overcurrent protection permitted for a 14 AWG copper branch-circuit conductor, absent a specific exception?
a.30 A
b.25 A
c.20 A
d.15 A
Explanation
Section 240.4(D)(3) limits 14 AWG copper conductors to a maximum overcurrent device of 15 A. This is why 14 AWG is used on 15-A branch circuits. 20, 25, and 30 A all exceed the small-conductor protection limit for 14 AWG copper.
Law Reference: 2023 NEC §240.4(D)Practice all 521 questions free — no signup required.
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