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Old question/ New Answers?

#87420 03/07/04 07:05 PM

Joined: Jan 2004

Posts: 1,507

Michigan USA

George Little Offline

Member

If I'm using THWN 4/0 Aluminum conductors to feed a Service panel with a 200 ampere main, What size Service do I have? Is the rating 200 amps or 180 amps?

George Little

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Re: Old question/ New Answers?

#87421 03/07/04 07:38 PM

Joined: Feb 2004

Posts: 133

MA, USA

Electric Ian Offline

Member

200Amps per table 310.15(B)(6), right?

Re: Old question/ New Answers?

#87422 03/07/04 07:48 PM

Joined: Apr 2002

Posts: 558

San Jose, CA

caselec

Member

Residential = 200 Amps
Other than Residential = 180 Amps but can be protected by 200 amp breaker or fuse.

Curt Swartz

Re: Old question/ New Answers?

#87423 03/07/04 08:30 PM

Joined: Feb 2004

Posts: 133

MA, USA

Electric Ian Offline

Member

what section of the code allows for protecting THWN 4/0 Aluminum with 200Amp fuses for other than Residential?

Re: Old question/ New Answers?

#87424 03/07/04 08:45 PM

Joined: Apr 2002

Posts: 558

San Jose, CA

caselec

Member

240.4(B)

Curt Swartz

Re: Old question/ New Answers?

#87425 03/07/04 09:28 PM

Joined: Feb 2004

Posts: 133

MA, USA

Electric Ian Offline

Member

Right you are caselec. Thanks.

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