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Wire size #220057
05/02/19 06:29 PM
05/02/19 06:29 PM
watersparkfalls  Offline OP
Member
Joined: Mar 2005
Posts: 233
Washington...Not DC
If you have a hydronic heat pump with a minimum ampacity of 23 amps and max of 35 amps wired with mc...wouldn’t sizing the wire to max current make the most sense? Has anyone ever had a problem with sizing motor to minimum ampacity before? Probably should have worded as a code question.

Thanks,
H20

2017 / 2014 NEC & Related Books and Study Guides
Re: Wire size [Re: watersparkfalls] #220060
05/02/19 10:34 PM
05/02/19 10:34 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,362
Estero,Fl,usa
The bottom line is, "what does the label say" . You don't need to wire any motor load for the locked rotor current because it is only there for a second or less. We wire for 125% of the full load amps. In a complex box like an HVAC system the industry engineers evaluate that box and give you a label for guidance. As an electrician or inspector we should just believe. You can use a #12 for that if everything is rated 75c (breaker, conductors and HVAC lug)


Greg Fretwell

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