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Considering 100A 240V service has 2 poles at 100A each is the total usable power actually 200A at 120V?
Wiki User
∙ 12y ago
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.
Wiki User
∙ 12y ago
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The maximum distance of a wire drop between a service pole and service connection is undefined, as it depends on many factors not included in the question. The information needed to actually compute such a distance includes, but it is not limited to, the service volts, the service Class (60, 100, 200, 400 or more amps), and whether or not the drop involves a mid span tap -- that is, the service is actually connected not to a pole, but it is connected to secondary wires between two poles. <<>> A utility company will usually bring their service a maximum of 100 feet on to private property.
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