Current-carrying service conductors must be: At least 8 AWG if copper, 6 AWG if aluminum [230.23(B)]. Of sufficient ampacity to carry the load as calculated per Article 220 [230.23(A)]. Of adequate mechanical strength [230.23(A)]. That last requirement seems redundant. If you’re using conductors of sufficient ampacity and permissible type, they will have adequate mechanical strength. Important: Do a thorough job of determining what load this service is going to ...

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