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-   -   Two circuits on one 2-pole breaker (http://www.diychatroom.com/f18/two-circuits-one-2-pole-breaker-165990/)

czars 12-09-2012 10:14 AM

Two circuits on one 2-pole breaker
 
I was looking at my service panel and discovered that a single 2 pole 20A breaker is being used to provide power to both a 120 v load (using a neutral) and and 240 v load without a neutral). The combined load is less than 10 amps. Is this arrangement permitted by the NEC?

rjniles 12-09-2012 10:29 AM

Yes, you have a MWBC (Multi Wire Branch Circuit) with line to line (240) and line to neutral (120) load.

stickboy1375 12-09-2012 10:33 AM

Yes, done all the time, I generally do it when an air handler is 240v and I need a 120v receptacle located at the unit as well.

ddawg16 12-09-2012 10:38 AM

Quote:

Originally Posted by stickboy1375 (Post 1069485)
Yes, done all the time, I generally do it when an air handler is 240v and I need a 120v receptacle located at the unit as well.

I like that......that way if you kill power to ether ckt....your killing both....better than have your 121 power from a different breaker.

rjniles 12-09-2012 12:09 PM

Quote:

Originally Posted by stickboy1375 (Post 1069485)
Yes, done all the time, I generally do it when an air handler is 240v and I need a 120v receptacle located at the unit as well.

I am not sure I would like that. You turn off the air handler and you lose power to the receptacle for lights and tools.

Unless you use a disconnect for the air handler only.

stickboy1375 12-09-2012 12:47 PM

Quote:

Originally Posted by rjniles (Post 1069567)
I am not sure I would like that. You turn off the air handler and you lose power to the receptacle for lights and tools.

Unless you use a disconnect for the air handler only.

Of course a disconnect is at the AHU... and besides, money is always an issue, so that's what they get.

stickboy1375 12-09-2012 12:48 PM

Quote:

Originally Posted by ddawg16 (Post 1069489)
I like that......that way if you kill power to ether ckt....your killing both....better than have your 121 power from a different breaker.

Nope.... and I really don't care... Money is time, and time is money.


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