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Old question/ New Answers?
#87420 03/07/04 08:05 PM
Joined: Jan 2004
Posts: 1,507
Michigan USA
G
George Little Offline OP
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 08:38 PM
Joined: Feb 2004
Posts: 133
MA, USA
E
Electric Ian Offline
Member
200Amps per table 310.15(B)(6), right?
Re: Old question/ New Answers?
#87422 03/07/04 08:48 PM
Joined: Apr 2002
Posts: 558
San Jose, CA
C
caselec Offline
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 09:30 PM
Joined: Feb 2004
Posts: 133
MA, USA
E
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 09:45 PM
Joined: Apr 2002
Posts: 558
San Jose, CA
C
caselec Offline
Member
240.4(B)

Curt Swartz
Re: Old question/ New Answers?
#87425 03/07/04 10:28 PM
Joined: Feb 2004
Posts: 133
MA, USA
E
Electric Ian Offline
Member
Right you are caselec. Thanks.

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