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#85326 - 06/20/03 07:15 AM Small commercial services  
RickG  Offline
Member
Joined: Jul 2001
Posts: 37
South County, R.I. USA
As far as the NEC goes, is it permissible to install 4/0 al service entrance conductors to a non dwelling service consisting of only 1 service disconnect? I thought that the minimum was 250 MCM al for this type of service. So many electricians seem to think that 4/0 is OK for 200 amp commercial. I am looking for other opinions & code references. Thanks,
Rick


2017 / 2014 NEC & Related Books and Study Guides

#85327 - 06/20/03 10:04 AM Re: Small commercial services  
Ron  Offline
Member
Joined: Mar 2002
Posts: 582
White Plains, NY
Table 310.15(B)(6) can only be used for dwellings. A 200A commercial service must be from table 310.16, 250 kCMIL AL minimum.


Ron

#85328 - 06/20/03 04:45 PM Re: Small commercial services  
engy  Offline
Member
Joined: Jun 2002
Posts: 15
Minnesota
4/0 Al 75deg is rated at 180A
Round 'er up to 200A.
4/0 must meet article 220 load calc.


#85329 - 06/20/03 08:39 PM Re: Small commercial services  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
240.4(B)Allows us to round up to the next standard size breaker under 800 amps.

Before doing this read the article yourself to see if you meet the 3 requirements.

For this service you should be all set.


Bob Badger
Construction & Maintenance Electrician
Massachusetts


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