NEC cond on 12/3 bx wire

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d1reyad

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Does nec code allow the use of 12/3 wire through the house , I ask because some inspector in ny dont allow the use of 12 3 wire to be use like i use 12 3 from the pannel to one AC out and from that ac out let i use a 12 2 to the next ac cuz i save wire like dat so i wanted to know if nec code allow you to use 12 3 in that knida ways
 
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NO, 12/3 is not allowed throughout the house, the bedroom circuits have

to be on AFCI breakers on 12/2 or 14/2 circuits.

Also, other circuits require larger conductors like range,dryer,etc.
 
Frank,
NO, 12/3 is not allowed throughout the house, the bedroom circuits have to be on AFCI breakers on 12/2 or 14/2 circuits.
Click to expand...
At least one breaker manufacturer has AFCIs for multiwire branch circuits.
Don
 
I know at least GE and CH have two pole AFCI in 15A and 20A flavors. The CH's can be had in independent trip and common trip configurations.
 
benaround said:
NO, 12/3 is not allowed throughout the house, the bedroom circuits have

to be on AFCI breakers on 12/2 or 14/2 circuits.

Also, other circuits require larger conductors like range,dryer,etc.
Click to expand...

And just how would you handle half hot receptacles ?Or fan/light combo with 2 switches ?
 
Jim W in Tampa said:
And just how would you handle half hot receptacles ?Or fan/light combo with 2 switches ?
Click to expand...

I don't think that's the situation the OP is describing. I read it as he wants to run 3-wire using two hots and a neutral to the first box, then split the two hots from there. As I read it, he's trying to save the cost difference between a length of 12/3 and two lengths of 12/2. Keyword is "save" in his initial post --

d1reyad said:
... cuz i save wire like dat ...
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d1reyad,


Welcome to the forum. You went back and edited your initial post. The new post is different from the first so it is now hard for someone to read from the first to the last and understand where certain questions and answers came from. You can simply add another post to this thread by clicking on the reply button and add any additional helpful information. This will make it easier for all of us to follow along.
 
d1reyad said:
Does nec code allow the use of 12/3 wire through the house , I ask because some inspector in ny dont allow the use of 12 3 wire to be use like i use 12 3 from the pannel to one AC out and from that ac out let i use a 12 2 to the next ac cuz i save wire like dat so i wanted to know if nec code allow you to use 12 3 in that knida ways
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Where may I ask are inspectors not permitting 12/3 cable? And what code article to they cite as a violation?
 
If he is using it to get 2 circuits its legal.Even before copper went up i would run 12-3 to the frig then 12-2 to first SA .For the next SA i might tag it for the micro.All of that was to save time if HR were long.With afci i dont think i would go there anymore for bedrooms.The new 12-4 and 14-4 were not around when i last wired a house.
 
You can simply add another post to this thread by clicking on the reply button and add any additional helpful information. This will make it easier for all of us to follow along.
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The button looks like this:
At the top and bottom of the page.

D1reyad said:
I ask because some inspector in ny dont allow the use of 12 3 wire to be use like i use 12 3 from the pannel to one AC out and from that ac out let i use a 12 2 to the next ac cuz i save wire like dat so i wanted to know if nec code allow you to use 12 3 in that knida ways
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I don't understand what the third wire is doing in this case? If two conductors are sized for both loads, why run a third conductor?

Edit: I read this as AC as in "Air Conditioner".

Please write in full sentences, it makes it easier to comprehend what you're describing.
 
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George he is talking about 2 air conditioning circuits. A 12/3 to the first receptacle and a 12/2 to the next. Each on it's own circuit. OK I'm guessing but that's how I interpreted his post.
 
Jim W in Tampa said:
If he is using it to get 2 circuits its legal.Even before copper went up i would run 12-3 to the frig then 12-2 to first SA .For the next SA i might tag it for the micro.All of that was to save time if HR were long.With afci i dont think i would go there anymore for bedrooms.The new 12-4 and 14-4 were not around when i last wired a house.
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I left NYC alooongggg time ago but the inspectors then would not let us use 4 wire bx.Red ,blk blue and a white with a sheathing ground.It was handy when you wanted a three way and carry a constant hot within one cable assy.But you didn`t argue with them if you ever wanted to pass another inspection in there area.
 
infinity said:
George he is talking about 2 air conditioning circuits. A 12/3 to the first receptacle and a 12/2 to the next. Each on it's own circuit. OK I'm guessing but that's how I interpreted his post.
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So you're thinking he's talking about two window 120V AC's?

I was thinking he was somehow wiring two 240V AC's with 12-3, and that didn't compute for me.

Hopefully, he will return and clear this up for us. :)
 
Hopefully, he will return and clear this up for us.
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I'm hope that he will. It's always nice when they do that. Keeps us from going off on wild tangents with guessing games.
 
nec code on wirein homes with 12/3 wire

nec code on wirein homes with 12/3 wire

does ny or nj allow you to use 12/3 wire to wire the house for example i use 12/3 from the pannel to one box and the from that box i use a 12 2 wire to the next circuit mostly i do this for like ac circuit and gfi so i dont have to run seperate wire 12 2 wire to the pannel box so i want to know if this way is allow by nec or nyc , AM NOT talkin bout 240 v
 
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d1reyad said:
does ny or nj allow you to use 12/3 wire to wire the house for example i use 12/3 from the pannel to one box and the from that box i use a 12 2 wire to the next circuit mostly i do this for like ac circuit and gfi so i dont have to run seperate wire 12 2 wire to the pannel box so i want to know if this way is allow by nec or nyc
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It is allowed by both the NEC and NYC. Given the cost of copper these days using MWBC for homeruns is a wise choice. NYC is under the 2002 NEC with some amendments. You can view the amendments here:

http://www.nyc.gov/html/dob/html/model/nec.shtml


Click on Local Law #81
 
problem leavine a post questioin

problem leavine a post questioin

am not able to post question can some one help me oot i can only reply to this post i put up a long time ago
 
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