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Q: Ground wire size for 125 amp service?
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What wire size do you need for a 3phase 90amp 60hz 220v?

Wire size is based on the amperage capacity of the service it is feeding. You tell me the service amps and I can tell you the wire size.


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


What size aluminum wire to feed 125 Amps 220 volt a distance of 175' and what size ground?

A 3/0 aluminum conductor will limit the voltage drop to3% or less when supplying 125 amps for 175 feet on a 220 volt system. If the 125 amp load is a sub distribution panel that is not going to be fully loaded to 125 amps then using the exact connected load, which might be smaller than 125 amps will effect the wire sizing. The grounding conductor for that size distribution panel is #6 bare copper.


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AWG # 1/0 copper would normally be used.


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To calculate the wire size you would have to find the amperage. I = W/E, 70000/240 = 291.67 amps. The wire size according to code has to be up sized to 125%. 291.67 x 125% = 364.6. 500MCM copper wire with an insulation factor of 75 and 90 degrees C is rated at 380 and 395 amps respectively. If parallel conductors were used the wire size for 75 degree wire would be 3/0 rated at 200 amps. Parallel conductors for 90 degree wire would be 2/0 rated at 185 amps.


What size wire do you need to run 200 ft of 125 amp?

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How many amps is 2 wire good for?

depends on its use. If its for residential service its good for 125 amps In commercial and industrial installations it's a bit more complicated but you end up at the same 125 amps.


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How many amps is 2 gauge wire good for?

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What size wire is needed to feed a 125 amp sub panel from a 200 amp panel less than 200 wire feet away?

A #1 copper wire with an insulation rating of 90 degrees C is rated at 140 amps.