What Size Wire For 40 Amp Breaker

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What is the appropriate wire size for a 50 amp circuit breaker? - Quora

Automotive wire size chart uk / standard cable What is the size of a solid copper wire for a 40 amp breaker?

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What is the appropriate wire size for a 50 amp circuit breaker? - Quora

What is the size of a solid copper wire for a 40 amp breaker? - Quora