Kirk, This is out of my normal realm but i would expect the inspector to take the breaker at it's max setting for the calculations. You could turn it lower without a problem but i doubt he would allow a lower setting due to it being turned up after he left. I bet they don't give that breaker away!
Later, Bob On 3/30/12, Kirk Herander <[email protected]> wrote: > Hello, > > Here's one I haven't come across before. I am about to start a 110kw system. > This is a 480/277 three phase ac output. The calcs tell me I need a 200 amp > breaker(after rounding up from the actual breaker calc of 180.5 amps) > feeding a 800 amp panelboard which is also fed by a 800 amp utility main > breaker. Following the 120% rule no more than 960 amps can be put on the > buss. But the source input will be 1000 amps from grid and pv combined. > However, the 800 amp breaker can be current-limited down lower (in this case > at least to 760 amps) by a manual dial with calibration markings on its > face. So I would think a reasonable AHJ would accept this as code-compliant. > The only other alternative is to replace the main with a 700 amp (no > fixed-amperage breaker is made between 700 and 800 amps), which for load > reasons the owner doesn't want to do. Thanks for your comments. > > > > A pesky inspector might say "what's to prevent some yahoo from turning the > breaker back up to 800 amps once I leave", for instance. > > > > > > Kirk Herander > > VT Solar, LLC > > dba Vermont Solar Engineering > > NABCEPTM Certified installer Charter Member > > NYSERDA-eligible Installer > > VT RE Incentive Program Partner > > 802.863.1202 > > > > _______________________________________________ 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
