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The short answer, if using copper, is 0 AWG, commonly referred to as 1/0 or "one ought".

Type of wire depends on location & temperature, but in my common scenario I am using 1/0 THHN inside a 2" schedule 40 PVC conduit (3 - 1/0 wires plus a 4 ga bare ground) to run indoors, a distance of about 25 feet from my main panel to a sub for upstairs.

I could go into more detail regarding outdoor, direct burial, grounding, aluminum wire, etc but would need more details.

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15y ago
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12y ago

2 AWG wire in copper and 1/0 (one ought) in aluminum.

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13y ago

In copper 1 AWG in aluminum 2/0 (Two Ought).

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9y ago

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

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9y ago

A #3 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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4y ago

1/0

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4y ago

2/0

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Q: What wire size for 125 amp service?
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Related questions

Ground wire size for 125 amp service?

For a 125 amp service, a ground wire size of 8 AWG copper or 6 AWG aluminum is typically sufficient. However, it's important to consult with local electrical codes and regulations to ensure compliance with specific requirements in your area.


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Yes, no problem at all going to a larger ampacity of wire. Larger size wire yes, smaller size wire no.


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AWG # 1/0 copper would normally be used.


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2AWG.


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


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10 guage


Do you need to change the wire size going from 100 amp service to 150 amp service?

Yes, the wire size has to be increased. The existing 100 amp service will now probably have a #3 conductor with an insulation factor of 75 or 90 degrees C which is rated for 100 and 105 amps respectively. Increasing to a 150 amp service will use a #1/0 wire size. If you are thinking of an upgrade, skip the 150 amp service and go to a 200 amp panel. New homes are installing 200 amp 42 circuit panels. The extra cost is only reflected in the materials as the labour costs will be the same regardless whether a 150 amp or a 200 amp panel is installed. The wire size for a 200 amp panel is #3/0. With an insulation factor of 75 or 90 degrees C the rating is 200 or 210 amps respectively.


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What gauge wire for service entrance in Wisconsin?

Depends on the size of the service. 100 amp service will require 3 gauge, 150 amp service will require 1/0 gauge, and 200 amp service will require 3/0 gauge.