Hans, There's a backup load panel that some house loads are transferred to that's fed from the 60A line side tap. Under normal operation they are fed from the PV with the remaining power coming from the line side tap off from grid. To be thorough, one would have to make sure that the backup loads aren't over 60A, and what's left in the main service panel wouldn't be over 60A. But yeah, it always depends on the AHJ.
Here in NJ I try to stay away from panel upgrades whenever possible. They can run from $2k-$3k, and that's not an adder I want to put on a client. Steven Lawrence Date: Wed, 31 Mar 2010 11:39:32 -0700 From: "Hans Frederickson" <[email protected]> To: "'RE-wrenches'" <[email protected]> Subject: Re: [RE-wrenches] Supply Side Tap Overcurrent Protection Message-ID: <[email protected]> Content-Type: text/plain; charset="us-ascii" Steven, I don't think the 60A disconnect for the line-side tap would qualify as part of the required 100A rating for the residential service. You aren't using it to supply the house loads. Unless I'm missing something, your proposal limits the residential service load to only 60A. I suppose you could argue it with the AHJ... but I think you're going against the intent of the code. These sections weren't written with any consideration to grid-tied PV feed-ins. -Hans Frederickson -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Steven Lawrence Sent: Wednesday, March 31, 2010 11:04 AM To: [email protected] Subject: Re: [RE-wrenches] Supply Side Tap Overcurrent Protection 230.80 "Where the service disconnecting means consists of more than one switch or circuit breaker, as permitted by 230.71, the combined ratings of all the switches or circuit breakers used shall not be less than the rating required by 230.79" Steven Lawrence _______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
