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Q: What size ground wire do I use for a 100 amp branch circuit?

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#4 Copper.

A #12 wire.

The minimum size home wiring is #14 AWG, the rating for that size wire is 15 amps.

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.

14 awg

Related questions

#4 Copper.

A #12 wire.

A GFCI can not be used on a three wire branch circuit. It has to be on a single two wire circuit.

#8

The minimum size home wiring is #14 AWG, the rating for that size wire is 15 amps.

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.

14 awg

14 awg

The minimum size home wiring is #14 AWG, the rating for that size wire is 15 amps.

The ground wire in a two or three conductor #12 cable is a #14 bare ground wire.

12 AWG.

#8 bare copper.

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