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#69672 - 09/16/06 07:24 AM Generator  
Sparks30  Offline
Member
Joined: Mar 2002
Posts: 125
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 07:49 AM Re: Generator  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
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

#69674 - 09/16/06 08:13 AM Re: Generator  
Sparks30  Offline
Member
Joined: Mar 2002
Posts: 125
Connecticut.usa
It is 8-3 NM thats why I told him that.


#69675 - 09/16/06 12:10 PM Re: Generator  
JJM  Offline
Member
Joined: Oct 2005
Posts: 100
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


#69676 - 09/16/06 12:22 PM Re: Generator  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
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

#69677 - 09/16/06 02:35 PM Re: Generator  
Sparks30  Offline
Member
Joined: Mar 2002
Posts: 125
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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