Wire Size For 125 Amp Service Panel. All wiring will be copper two #2 thhn for hot, one #3 thhn for neutral and one #4thhn for the ground. A 2/0 aluminum conductor with an insulation factor of 90 degreesc will limit the voltage drop to 3% or less when supplying 125 ampsfor 120 feet on a 220 volt system.

31 rows wire size chart. I would like to run copper wire, is aluminum that much less expensive? Any other reason to use aluminum over copper?

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100A Is #3 Copper ($600/100Ft) Or #1 Aluminum ($175/100Ft).

Any other reason to use aluminum over copper? 125 amp requires a wire size 2/0. (this would be the bare minimum) you could always run 500s and be prepared for the future as well )

Average Cost Ranges From $1000 To.

The wire you use determines the temperature rating you need to follow and the corresponding capacity recommendations. For example, you may use a 10 awg or american wire gauge for a 30 amp appliance, and a size 8 awg for a 45 amp device. What size aluminum wire needed for 125 amp service 120 feet underground in conduit 220 volt single phase?

125 Amp Sub Panel 2 Awg Copper Conductors Are Sufficient, Exactly As Bob Has Mentioned.

What wire size is the 250' run? Since this is a single phase dwelling service you can use #2 awg copper or 1/0 aluminum for a 125 amp service or main feeder. Existing is 3 wire #2 cu cable so i have to replace it.

Electrical Panel & Service Size:

Average cost ranges from $150 to $400, with a median cost of $275. I have a 400 amp service in my home and will be running a line to my shop with a total run of 250' to feed a sub panel 125 amp service. The run will be about 100 feet and the breaker boxes are 125 amp.

Wiring Size Requirements Differ Per Amp Rating Of The Circuit.

Please help me determine which column to use for my cable size. For 150 amp, the right wire size is. A #1 copper wire with an insulation factor of 75 or 90 degrees c is rated at 130 and 140 amps respectively.