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Multiwire circuit.

Posted by JT on July 31st, 1998 01:41 PM
In reply to 180 out of phase by Alexander on July 30th, 1998 07:33 PM [Go to top of thread]

Alexander, breaker positions on each side alternate
between legs so that two-pole breakers may be used
where 240V or multiwire circuits are desired. Sometimes
half-height breakers are used to get two circuits
in place of one. In this case, both circuits are
on the same leg and the voltage between them is 0.

To verify, measure voltage between the two hot wires
(which should be black and red or blue) at the
receptacle, it should be approximatly 240V. You
should also be able to see where the tabs on each
side that normally connect the terminals of the upper
and lower receptacle have been removed. If both hot
wires are on the same leg (i.e. you measure 0V between
them), something is wrong and you might want to have
an electrician take a look.

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