We can summarize the rules for circuit sizing and overcurrent protection of PV circuits as follows: Conductor ampacity before correction and adjustment. PV circuit conductors must have an ampacity of at least 125% of the calculated maximum circuit current (CMCC) [690.8(A)] before the application of conductor ampacity correction and adjustment [690.8(B)(1)]. Conductor ampacity after correction and adjustment. Circuit conductors must have an ampacity of at least 100% of the CMCC after the ...

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