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Joined: Mar 2002
Posts: 125
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Having a bad morning,what is the wire size for 50 amp generator. Told the H.O 6-3. Doesn't want to pay. He already has 8-3 ran from previous install of portable. Thanks
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Joined: Jan 2003
Posts: 4,391
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If it is 8/3 NM than it is rated 40 amps because of 334.80
If was 8/3 MC or 8 AWG in conduit it would be rated 50 amps.
Bob Badger
Construction & Maintenance Electrician
Massachusetts
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Joined: Mar 2002
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It is 8-3 NM thats why I told him that.
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Joined: Oct 2005
Posts: 100
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Even #6 AWG is STILL inadequate.
Conductors for standby generators need to be sized not less than 115% of the generators nameplate rating: NEC 445.13. In this case 50A x 115% = 57.5A, so you need to go with #4 AWG minimum in this application.
Joe
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Joined: Jan 2003
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Joe that is a good point.
However I believe Sparks gave us the breaker size which is not the same as the generators rating.
Bob Badger
Construction & Maintenance Electrician
Massachusetts
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Joined: Mar 2002
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I forgot about the 115% rule. The genorator is rated at 50 amps. It's been awhile since iv'e installed one. It is going to be one of those Bryant all-in-one setup. The only proble is that where he wants it is about 40' away. And he wants to try to reuse what he has. Thanks again Sam
[This message has been edited by Sparks30 (edited 09-16-2006).]
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