Is there a minimum size wire gauge for fractional motors

2 replies [Last post]
Mike Trissel's picture
Joined: 2013-10-18

Is there a minimum individual conductor standard size wire for fractional hp motors used in large industrial panel boxes, even when the load specs do not require it?
Seems like I read somewhere that #14 was the smallest allowable gauge for motor protection, even though a fractional HP motor might have overload protection rated at much less.

Mike b's picture
Joined: 2013-10-28

Section 430.21(G) pretty much answers your question. Basically, put the smallest conductor (shall not be smaller than 14 AWG), unless you are applying the Exceptions.

mdshunk's picture
Joined: 2014-03-14

Depends on whether you're under the NEC or NFPA 79. I can see compliant ways to run #18 to fractional horsepower motors, depending on how this install is arranged.

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