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Multiwire circuit

Posted by JT on July 30th, 1998 07:07 PM
In reply to Common Neutral questions by Alexander on July 30th, 1998 12:57 PM [Go to top of thread]

Alexander, what you have is called a multiwire
circuit and is in fact two separate 15A. circuits.
The neutral carries only the difference in loads
between the to hot legs (remember that the voltage
on these legs is 180 degrees out of phase).
There are a couple of possible downsides to
his kind of circuit. If for some reason the neutral
connection should come loose, things can get very
weird. Second, is that there is an increased noise
coupling between the two legs since they share the
impedance of the common neutral. This might be of
concern if, say, you had refridgerator or other
compressor on one leg and a computer or other sensitive
equipment on the other. The longer the run of common
neutral, the more coupling. Most electrical equipment
should have no problem.

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