3 wire GFI

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oneelectron

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I have used this wire method for years, passing with flying colors. Lately I have been working for a company that says this is a violation. Have I been miss led before by code enforcement or this new shop, NEC seems hazy in this area.

Using 12-3 on a 2 pole 20, I pull to a bedroom for rec. pigging the neutral I pull the second circuit to the GFCI rec in a bath.

Where is there a violation and why?
 
Re: 3 wire GFI

Well It use to work But now since the NEC requires AFCI breakers to protect bedroom circuit's It won't any more as you can't share a neutral on a single pole AFCI. and those two-pole AFCI can be costly.And also with a multi-wire circuit you only need a two-pole breaker if both circuits are on the same strap/yoke like feeding a duplex receptacle that has the tie cut between the two receptacles and each has one circuit to it. if the multi-wire circuit runs to different receptacles then there is no requirement for a two-pole breaker or handle ties.
 
Re: 3 wire GFI

I was hoping to use an afci rec for the bed room but the code says ENTIRE branch circuit so the example i gave will not work for 2002 code. I have been told by the same shop I cant do the same thing in the kitchen (Ref. cir.1 Small app. cir. 2 ),no afci here but they consider the GFI a shared neutral and will not work correctly. It works for Alachua Co. FL.
 
Re: 3 wire GFI

Either installation complies. As Wayne said, you would need an AFCI breaker for the first situation, making it economically infeasible. As far as teh kitchen goes, I can't think of any requirement that would prohibit the practice.
 
Re: 3 wire GFI

I have seen 14/3 connected to 2 seperate breakers, 15A single pole.

Is this a violation since you can open the one breaker and the other would still be shut.
 
Re: 3 wire GFI

Rich, there is no violation unless both terminate on one yoke.

Oneelectron, This shop you are with has some misconceptions of code issues vs operating issues.

There is nothing wrong with using "Multi-wire Branch Circuits" where they will not affect the operation of equipment or a device, and infact they are a more efficient and sensable wiring method.


Roger
 
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