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#87420 - 03/07/04 04:05 PM Old question/ New Answers?
George Little Offline
Member

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
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?
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#87421 - 03/07/04 04:38 PM Re: Old question/ New Answers?
Electric Ian Offline
Member

Registered: 02/10/04
Posts: 132
Loc: MA, USA
200Amps per table 310.15(B)(6), right?

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#87422 - 03/07/04 04:48 PM Re: Old question/ New Answers?
caselec Offline
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Registered: 04/14/02
Posts: 557
Loc: San Jose, CA
Residential = 200 Amps
Other than Residential = 180 Amps but can be protected by 200 amp breaker or fuse.
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#87423 - 03/07/04 05:30 PM Re: Old question/ New Answers?
Electric Ian Offline
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Registered: 02/10/04
Posts: 132
Loc: MA, USA
what section of the code allows for protecting THWN 4/0 Aluminum with 200Amp fuses for other than Residential?

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#87424 - 03/07/04 05:45 PM Re: Old question/ New Answers?
caselec Offline
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Registered: 04/14/02
Posts: 557
Loc: San Jose, CA
240.4(B)
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#87425 - 03/07/04 06:28 PM Re: Old question/ New Answers?
Electric Ian Offline
Member

Registered: 02/10/04
Posts: 132
Loc: MA, USA
Right you are caselec. Thanks.

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