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Q: What size wire for 100 amp panel 200 feet away from a 200 amp service?

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20Sqmm

Depends on the size of the sub-panel in that garage. If you are installing a 60 amp sub-panel 400 feet away from the main service panel then use AWG # 4.

For that distance I would run AWG # 3 copper and install a sub-panel.

1/0 copper

AWG # 4

A 200 amp service panel with a 60 amp sub-panel.

You will need to run AWG #4.

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.

AWG 2/0 copper.

Need to know what the load amperage is on the 100 amp panel. If interested, open discuss question page.

AWG #6 will work fine at 100 feet with only a 2% drop in voltage which is acceptable.

8 AWG copper is rated for 40 amps. Over 150 ft, at maximum current, the voltage drop would be about 3.76 volts. Using 6 AWG would have a voltage drop of 2.36 volts with the same 40 amps.

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