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feeder sizing #193792
04/20/10 12:50 AM
04/20/10 12:50 AM
watersparkfalls  Offline OP
Member
Joined: Mar 2005
Posts: 222
Washington...Not DC
how should I calculate generator feeders? I have a 17 KW generator 71 amps, 310.15 allows #4 for 100 amps, but does it allow #6 for 71 amps? Do I size according to 310.16 which is still #4?
Thanks,
H20

2017 / 2014 NEC & Related Books and Study Guides
Re: feeder sizing [Re: watersparkfalls] #193795
04/20/10 02:32 AM
04/20/10 02:32 AM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,167
Estero,Fl,usa
You can only use 310.15(B)(6) if this is a main feeder for the entire dwelling, basically an extension of the service entrance from a disconnect. That is, by definition, a #4 minimum. In no case could you interpolate down to a #6.
Any other application has to use 310.16.


Greg Fretwell
Re: feeder sizing [Re: gfretwell] #193802
04/20/10 11:46 AM
04/20/10 11:46 AM
watersparkfalls  Offline OP
Member
Joined: Mar 2005
Posts: 222
Washington...Not DC
thanks Gfretwell


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