Bruce,
Use a standard 125-amp panel with a 100-amp main breaker. This is a very common panel and does not require downsizing the main breaker any further (it is already downsized). It allows up to a 50-amp PV breaker. Bill. From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Mendocino Solar Service Sent: Friday, July 31, 2009 9:57 AM To: RE-wrenches Subject: [RE-wrenches] down-sizing main breaker Hi Folks, Can anyone provide code reference or advice on this question? Our customer has 100 amp service at the meter pedestal, 100 amp main breaker feeding 200 foot underground run to a 100 amp panel at the house. We need to land a 40 amp breaker, so are proposing to replace main panel at house with 200 amp panel. The AHJ says we need a 200 amp main breaker in this panel, which will work, but says this requires upsizing the feeder, main breaker at meter, and therefore utility service to 200 amps. I've read on this list and elsewhere about downsizing the main breaker in a panel to create capacity to make the 120% rule. This AHJ says you can't put in a breaker smaller than the panel size, and furthermore, everything upstream would have to be upsized. Is this from the code? Bruce Erickson Mendocino Solar Service PO Box 1252 Mendocino, CA 95460 707-937-1701
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