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A 125 amp panel or subpanel requires # 2 gauge feeders and neutral. (# 2 awg is rated for 130A) However, depending on the existing load in your main 150A panel you likely don't have enough power to operate a 125 Amp subpanel.

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14y ago
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9y ago

4 AWG in copper.

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Note that while 4 AWG is legal to run per NEC, if the panel is heavily loaded you will exceed the recommended maximum voltage drop (3%). For that length of run it would be advisable to increase the wire size to lower the voltage drop.

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10y ago

Normally you would use AWG #6 but for this long run and voltage drop I would recommend you use AWG # 4.

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11y ago

A 2/0 aluminum conductor will limit the voltage drop to 3% or less when supplying 125 amps for 150 feet on a 240 volt system.

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8y ago

A #2 copper conductor with an insulation factor of 90 degrees C is rated at 130 amps.

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10y ago

Use AWG # 1/0 gauge copper.

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10y ago

You will need to run AWG #4.

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Q: What size wire to run 150 feet away 60 amp sub panel?
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What size wire to run 250 feet away 60 amp sub panel?

Re Question with the voltage that you will be using.


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