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#87420 - 03/07/04 08:05 PM Old question/ New Answers?  
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
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?


George Little

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#87421 - 03/07/04 08:38 PM Re: Old question/ New Answers?  
Electric Ian  Offline
Member
Joined: Feb 2004
Posts: 133
MA, USA
200Amps per table 310.15(B)(6), right?


#87422 - 03/07/04 08:48 PM Re: Old question/ New Answers?  
caselec  Offline
Member
Joined: Apr 2002
Posts: 558
San Jose, CA
Residential = 200 Amps
Other than Residential = 180 Amps but can be protected by 200 amp breaker or fuse.


Curt Swartz

#87423 - 03/07/04 09:30 PM Re: Old question/ New Answers?  
Electric Ian  Offline
Member
Joined: Feb 2004
Posts: 133
MA, USA
what section of the code allows for protecting THWN 4/0 Aluminum with 200Amp fuses for other than Residential?


#87424 - 03/07/04 09:45 PM Re: Old question/ New Answers?  
caselec  Offline
Member
Joined: Apr 2002
Posts: 558
San Jose, CA
240.4(B)


Curt Swartz

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



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