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I would recommend 1/0 just to be sure you have very little line loss.

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It depends on whether the 100 amp panel is rated at 100% or 80% loading.

If the panel is only rated for 100% loading, meaning that a full 100 amps can be drawn from it, the wire size will be #2 copper conductor which is rated at 130 amps. The feeder can only be loaded to 80 present so will have a working amperage of 130 x .8 = 104 amps.

If the panel is only rated at 80 percent loading then a #3 copper conductor can be used. A #3 copper conductor with an insulation factor of 90 degrees C is rated at 115 amps. 115 x .8 = 92 amps.

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βˆ™ 10y ago
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βˆ™ 13y ago

A #10 copper wire with an insulation factor of 90 degree C and a voltage rating of 300 volts has an ampacity of 30 amps.

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βˆ™ 10y ago

A 100 amp residential panel requires that you use AWG # 3 service entrance wire.

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βˆ™ 15y ago

You would need a #8 copper wire insulation rating of 90 degrees C to supply 240 volts 100 feet to a 30 amp single phase load.

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Q: What gauge wire do you need for 220v 100a power?
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How do you rewire a 110v RV generator ONAN to produce 220v for backup power for your house?

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You ran power from your house to your shop about a year ago The problem you are having is one of the bus legs in your shop panel box is not hot so every other 20 amp breaker is not hot on that leg?

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Considering 100A 240V service has 2 poles at 100A each is the total usable power actually 200A at 120V?

No, amperage is not additive, but a constant. Think of power as water, its always the same temperature, hot (amps). The pressure is variable (volts). The true answer is undoubtedly more complex, but you get the point. If you need to draw 200 amps you would actually need a 400 amp service because code states you cannot have more than an 80% load on a breaker That's an interesting question and I had to run the theory through my brain a few times to confirm my answer. The answer is if you have a 100A 240V service, you could draw what appears to be 200A from that panel at 120V. If you install 100A 120V single pole breakers on each side of the panel (in reality this would be many breakers but let's keep it simple) then both breakers will operate just fine, giving the appearance of 200A. In reality, however, one breaker actually feeds through to the other breaker. The neutral only carries the unbalanced load so in this hypothetical situation the neutral at the panel carries 0A. So the answer to the question is...if you install ONLY 120v single pole breakers, you can run up to 200A on those circuits (or 80% of that as we have discussed.) But you are only running 100A on each leg of the service conductors and breaker.


What gauge wire do you need for a 600w rms Subwoofer 1200w Peak?

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