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A #3 copper wire with an insulation factor of 75 and 90 degrees C is rated at 100 and 105 amps respectively.

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Q: What size wire for 100 amp 240 volt service?

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See Table NEC 310.16 but #6 copper is safe.

Service wire for 100 amps requires AWG #3 copper.

A 2/0 aluminum conductor, with an insulation factor of 90 degrees C, when supplying 100 amps for 200 feet on a 240 volt system, will work.

Service entrance wire must be AWG # 4 Copper wire.

#2 wire copper

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Service entrance wire size is AWG # 3 copper.

A 100 amp residential service requires a size #8 copper wire, it should be insulated in green.

See Table NEC 310.16 but #6 copper is safe.

The minimum size grounding conductor for a 100 amp service is a #8 bare copper wire.

2 AWG Aluminum for 100 Amp Service.

Service wire for 100 amps requires AWG #3 copper.

4 AWG

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A 2/0 aluminum conductor, with an insulation factor of 90 degrees C, when supplying 100 amps for 200 feet on a 240 volt system, will work.

Service entrance wire must be AWG # 4 Copper wire.

#2 wire copper

A 100 amp service requires that you use AWG 4 copper wire or AWG 2 aluminum wire.

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