A main 100-amp circuit breaker or main feeder line supplying a 100-amp sub-panel typically requires heavy-gauge copper or aluminum wire to safely handle the electrical current. Under National Electrical Code (NEC) guidelines, this generally calls for 2-gauge copper wire or 1-gauge aluminum wire. The exact wire sizing must always account for temperature ratings, conduit types, and total distance of the electrical run to prevent dangerous overheating.
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