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A #8 copper conductor with an insulation factor of 60 degrees C is rated at 40 amps. For a built in safety factor, a #8 conductor with an insulation factor of 75 or 90 degrees C has a rating of 45 amps.

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15y ago

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More answers

#10 is ok in some states, the nec says #8.

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17y ago
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In most conditions you can use 8 AWG, but if there are any questions, contact a qualified electrician or your local building inspector.

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12y ago
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AWG # 8 copper.

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12y ago
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#8

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12y ago
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Q: What size cable for a 40 amp breaker?
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