120/240V single phase amps?
120/240V single phase amps?
(OP)
I have been racking my brain and just cant rember the answer to this question.
If you have a single phase 3 wire two hots and a neutral service that is 120/240v and a 100A main how many amps can you draw total? I know this is probly a stupid question but i am getting hung up on the fact that if I draw draw 100 amps from one of the 120v feeds and 100amps from another 120v feed am i drawing 200A from the transformer up stream of jsut 100Amps?
If you have a single phase 3 wire two hots and a neutral service that is 120/240v and a 100A main how many amps can you draw total? I know this is probly a stupid question but i am getting hung up on the fact that if I draw draw 100 amps from one of the 120v feeds and 100amps from another 120v feed am i drawing 200A from the transformer up stream of jsut 100Amps?






RE: 120/240V single phase amps?
David Castor
www.cvoes.com
RE: 120/240V single phase amps?
RE: 120/240V single phase amps?
Well, a circuit breaker knows nothing about voltage at least as far as current carrying ability. A 100 A breaker can carry 100 A. (Actually 80 A continuously).
As far as the transformer, current can't flow in only one leg of the secondary. If 100 A are going out on one leg, 100 A is returning somewhere.
David Castor
www.cvoes.com
RE: 120/240V single phase amps?
Bill
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