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#69672 - 09/16/06 05:24 AM Generator
Sparks30 Offline
Member

Registered: 03/23/02
Posts: 125
Loc: Connecticut.usa
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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#69673 - 09/16/06 05:49 AM Re: Generator
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
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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#69674 - 09/16/06 06:13 AM Re: Generator
Sparks30 Offline
Member

Registered: 03/23/02
Posts: 125
Loc: Connecticut.usa
It is 8-3 NM thats why I told him that.

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#69675 - 09/16/06 10:10 AM Re: Generator
JJM Offline
Member

Registered: 10/31/05
Posts: 102
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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#69676 - 09/16/06 10:22 AM Re: Generator
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
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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#69677 - 09/16/06 12:35 PM Re: Generator
Sparks30 Offline
Member

Registered: 03/23/02
Posts: 125
Loc: Connecticut.usa
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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