downsizing main breakers [RE-wrenches]

Jim Easton jim at altenertec.com
Fri Oct 20 08:44:46 PDT 2006


Our jurisdiction:

1) The local utility (San Diego Gas & Electric) is quite unhappy about doing
this, feeling that, since the panel is designed for a larger breaker, one
may very well get put back in. Major arm twisting is needed.
2) A "permanent plaque" stating that the "main breaker ampacity may not
exceed..." is placed at the panel.
3) A load calculation is provided the AHJ in the permitting package.

Jim Easton
Alternative Energy Technologies
CSL: 852243
9465-B Mission Park Place
Santee, CA 92071
Tel: 619-262-8800
Fax: 619-562-8811
Cell: 858-527-0240
-----Original Message-----
From: Geoff Greenfield [mailto:Geoff at Third-Sun.Com] 
Sent: Friday, October 20, 2006 6:22 AM
To: RE-wrenches at topica.com
Subject: RE: downsizing main breakers [RE-wrenches]


Wrenchtastic list members, What steps do you take (and what part of the NEC
is referenced) when deciding to downsize a main breaker for busbar loading
issues?  My client is ready to "wing it" and slap a 150 amp breaker into the
200 amp panel, and this is an un-inspected job, but what about nuisance
trips? sizing a service seams very elementary, but I would like to know the
proper way to do it!

Happy weekend to all and safe travels to the folks returning from San Jose

For a brighter energy future,

Geoff Greenfield
NABCEP Certified Energy Practitioner

THIRD SUN SOLAR & WIND POWER Ltd.
340 West State Street
Athens, OH 45701

www.third-sun.com
(740) 597-3111


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