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Service entrance wire must be AWG # 4 Copper wire.

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Q: What size wire for 100 amp residential?

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3 AWG copper for typical residential applications.

Assuming the voltage is 240 volts, the wire size for a 100 amp panel at the end of 400 feet and holding the voltage drop to 3 %, the wire will be 3/0 in size.

The answer is likely NO. I assume you're talking about a 60 amp subpanel. To upgrade to a 100 amp, the wire size will need to be increased. (replaced with the correct size) This is not a job for amateurs but should be done by a qualified electrician. The typical size wire employed for a 60 amp supply is # 6 awg, whereas the minimum wire size for 100 amp is # 3 awg (which is larger).

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100 amp

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3 AWG copper for typical residential applications.

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SE #2

AWG #3 wire

Assuming the voltage is 240 volts, the wire size for a 100 amp panel at the end of 400 feet and holding the voltage drop to 3 %, the wire will be 3/0 in size.

The answer is likely NO. I assume you're talking about a 60 amp subpanel. To upgrade to a 100 amp, the wire size will need to be increased. (replaced with the correct size) This is not a job for amateurs but should be done by a qualified electrician. The typical size wire employed for a 60 amp supply is # 6 awg, whereas the minimum wire size for 100 amp is # 3 awg (which is larger).

Service entrance wire size is AWG # 3 copper.

A 100 amp residential panel requires that you use AWG # 3 service entrance wire.

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