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Re: Another elecrtical question


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Posted by John T on September 01, 2015 at 18:01:39 from (216.249.74.3):

In Reply to: Another elecrtical question posted by 37Chief on September 01, 2015 at 15:14:02:

37 Chief, If I understand your post, you're wanting to wire what's called in the trade a "Multi Wire Branch Circuit"

YES IT POSSIBLE IF DONE CORRECTLY but its NOT for amateurs who don't understand whats happening

A Multi Wire Branch Circuit has 4 wires: Two Hot Ungrounded Conductors (different legs of course),,,,,,,,, One Common Neutral GrounDED Conductor,,,,,,,,,,One Equipment GroundING Conductor. In my years as an Electrical Power Distribution Engineer I specified very few such circuits and indeed it saved money and time over having to run an extra Neutral wire. I would sever the duplex receptacles tie bar on the HOT side and wire one of the hot legs to each (top and bottom) but connect the single common Neutral over on the Neutral side. If both legs were feeding say an equal 16 or whatever equal amps NEUTRAL CURRENT WOULD BE ZERO. The advantage is there are twice as many available amps in the duplex receptacle if wired to a multi wire branch circuit. You could run one 1500 watt electric heater out the top duplex and another 1500 watts out the bottom, WITH ONLY A SINGLE NEUTRAL,,,,,,,, you CAN NOT do that on a standard wired duplex receptacle

HOWEVER realize there is 240 volts Line to Line inside that box versus only 120 volts in a standard branch circuit.
HOWEVER most lay Billy Bob and Bubba "home electrical experts" lol dont realize 240 is present
HOWEVER you must use a two pole tied circuit breaker such that you are turning off BOTH hots for working the receptacle.
HOWEVER if you have a lot of inductive loads like computer transformer power supplies where harmonic currents are present YOU
COULD OVERHEAT THE NEUTRAL. Best for resistive loads.

There's more but that's enough for now. As always Electrical and Legal questions draw the most responses.

Sorry if I misunderstood your post and question, but this is good info for lay persons regardless if they want to run a single common Neutral with two Hots.

John T Long retired and NEC has changed so NO WARRANTY


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