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fj5gtx 07-08-2013 11:01 AM

two hots, one neutral?
Looking at a main panel, I see 14-3 w ground coming in. black connected to breaker 1, red connected to breaker 2, and white/ground connected to the ground bus. Its not 220... wth? Is this legal/safe? Seems wrong to me, I thought every hot should have a dedicated "white" return.

joed 07-08-2013 11:09 AM

This is called a multi wire branch circuit MWBC.
The voltage between the black and red must be 240 volts. The breakers must handle tied or a double pole breaker so that both off together. If installed properly(240 volts between hots) they are perfectly safe. WE use them all time in Canada for kitchen counter split wired receptacles.

wirenut1110 07-08-2013 11:28 AM

If it was installed prior to the 08 code adoption, it's legal unless it supplied a receptacle with the tabs broken.

fj5gtx 07-08-2013 11:36 AM

I just checked with my volt meter, the red and black is 240v apart... but on separate half breakers, many slots separated. House was built in PA, circa 1988. I have 3 of these circuits, none of them have tied handles or are marked in any special way.

Sounds like its electrically safe... but I'll be adding other circuits that will cause an inspection, what should I do to make these 3 circuits pass that inspection?


wirenut1110 07-08-2013 11:42 AM

As long as you're not doing anything with those circuits they're fine as is. You can't be made to bring something up to code that was legal when it was installed. It's called "grandfathered"

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