No, standard 2 AWG copper wire will typically not fit directly into the terminal lug of a standard 100-amp molded-case circuit breaker, as most 100-amp breakers are engineered to accept smaller wire gauges (such as 3 AWG or 4 AWG copper, or 1/0 AWG aluminum) based on their terminal opening dimensions. Attempting to force oversized 2 AWG wire into a smaller terminal lug creates an insecure connection, high electrical resistance, localized overheating, and potential fire hazards.
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