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For example: if a 100 amp rated panel is protected by a 100 amp main breaker, then a 20 amp PV tie-in-breaker is allowed to backfeed that panel if the backfed breaker is located at the end of the busbars (last breaker slot furthest from where the panel receives its power). NEC 705.12(D)(2) and (D)(7) c. ................
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