Hi Wrenches, I know I have seen this somewhere before but can't seem to locate it in the archives. Recently and AHJ rejected our plans because, although we were compliant with the 120% rule applied to the busbar on the existing sub which was our solar PCC, the existing breaker feeding the existing sub (our PCC) exceeded the 120% as it applied to the bus in the main. I was under the impression that the 120% applies to the bus at the PCC and that existing equipment "downstream" or "upstream" of the PCC need not be retrofitted to comply with the 120% rule (conductor ampacity aside). Cheers, Eric Stikes Founding Director & CEO Good Sun Solar, A CA non-profit corp. www.goodsun.life (530)798-3738
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