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Fred Bloggs
 
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Default Commercial mains wiring: 12ga wire for 30 amp load?



GregS wrote:



It does not have to be matched. Only on how big the breaker can be.
The wire can be bigger than the breakers rating.


Nonsense- if you hook say 40A 6ga to a 20A breaker, that 40A will trip
the breaker almost immediately...