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What is the smallest copper wire size permitted by the national electric code for a 20 amp single phase electrical circuit?

Updated: 8/10/2023

Wiki User

∙ 10y ago

Best Answer

I think you mean either what is the correct size or minimum wire size needed when a branch circuit is protected by a 20 A breaker. The size is 12 American Wire gauge (AWG). 14 AWG is used for 15 A circuit and 10 AWG for a 30 A breaker. The lower the gauge the larger the cross-section of the wire.

Wiki User

∙ 13y ago

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Wiki User

∙ 10y ago

A #12 copper wire, insulation 90 degree is rated at 20 amps.

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Wiki User

∙ 11y ago

#12 AWG copper or #10 AWG aluminum

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Wiki User

∙ 13y ago

A #12 wire.

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Wiki User

∙ 12y ago

12 AWG.

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