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Old 07-24-2011, 06:18 PM   #1
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No Sheath Round 12/3 Wire


Installing an outside outlet about one foot away from present(inside) receptacle(outlet). In the process of pulling the black, white and ground wire into the outletI I pulled the sheath off. I went ahead and installed receptacle(outlet) which works fine. Is there any concern about leaving the wires unsheathed in the wall? Please advise.

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Old 07-24-2011, 06:47 PM   #2
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No Sheath Round 12/3 Wire


Yes pull a new piece in. The sheathing is there for a reason. One being to keep the wires next to each other so their magnetic fields will cancel each other out, reducing inductive heating of the wire insulation. Suggest stripping the sheathing of a new piece on both ends and taping the sheath to the wires a little before pulling it in. Should help keep it on.

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Old 07-24-2011, 10:19 PM   #3
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Thanks for the advice. I will have to remove the wires from the outlets(ugh) and begin with a new piece of 12/3. I cannot get to this right away but will do it tomorrow. I do not plan to use these outlets for the present time i.e. nothing plugged in.
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Old 07-24-2011, 10:25 PM   #4
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No Sheath Round 12/3 Wire


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Originally Posted by TFSpaniel
Thanks for the advice. I will have to remove the wires from the outlets(ugh) and begin with a new piece of 12/3. I cannot get to this right away but will do it tomorrow. I do not plan to use these outlets for the present time i.e. nothing plugged in.
Even with nothing 'plugged in' you should kill the circuit until you fix it. Just in case you don't get to it tomorrow

It will be safer and it will remind you to fix it.
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Old 07-25-2011, 03:55 AM   #5
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No Sheath Round 12/3 Wire


I can only guess you have a black,a white,and a bare copper which is a 12/2 nm. I agree with the other responders that say redo it because it isn't an approved wiring raceway/metheod.
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Old 07-25-2011, 07:32 AM   #6
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No Sheath Round 12/3 Wire


One last question! I still have the unblemished sheathing that was pull off the three wires. It can easily be slid back on the wires connecting both outlets. Would that be adequate?? And yes I have killed the circuit until I can alleviate the problem.

Last edited by TFSpaniel; 07-25-2011 at 07:34 AM.
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Old 07-25-2011, 12:28 PM   #7
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No Sheath Round 12/3 Wire


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One last question! I still have the unblemished sheathing that was pull off the three wires. It can easily be slid back on the wires connecting both outlets. Would that be adequate?? And yes I have killed the circuit until I can alleviate the problem.
I can't think of a reason not to. As long as it's just like it was originally, it seems fine.
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Old 07-25-2011, 05:56 PM   #8
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Could not thread the sheath through the access hole. Scrapped that idea and went back to square one and used a clamp. Only took 'bout an hour and half. Amazing when you do things over how much quicker things go.

Thanks for all the advice. Now maybe my house won't burn down. Ha!

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Last edited by TFSpaniel; 07-26-2011 at 08:43 AM.
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Old 07-25-2011, 06:06 PM   #9
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No Sheath Round 12/3 Wire


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Could not thread the sheath through the access hole. Scrapped that idea and went back to square one and used a clamp. Only took 'bout an hour and half. Amazing when you do things over how much quicker things go.

Thanks for all the advice. Now maybe my house won't burn down. Ha!

I just love this site and those who participant!
Hip Hip Hooray for doing it right, even if it wasn't the first time. It's how we learn, after all.
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Old 07-26-2011, 06:02 AM   #10
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No Sheath Round 12/3 Wire


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One being to keep the wires next to each other so their magnetic fields will cancel each other out, reducing inductive heating of the wire insulation.
Inductive heating of the insulation? The only time inductive heating is an issue is if there is a ferrous material between the conductors. Otherwise, you can separate them as much as you want without a heating issue (see old K&T installations), but there would be a code issue. Separating conductors can cause EMI problems also.

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Old 07-26-2011, 08:46 AM   #11
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Nice to know. Next time that should happen(no sheath) I will not worry but I do feel better with the sheath intact on the second try.
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Old 07-26-2011, 11:15 AM   #12
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Nice to know. Next time that should happen(no sheath) I will not worry but I do feel better with the sheath intact on the second try.
I didn't say that no sheathing is fine. It is a problem. It just has nothing to do with inductive heating.

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Old 07-26-2011, 12:24 PM   #13
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Just curious but what are the negatives in that situation?
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Old 07-26-2011, 02:41 PM   #14
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It'd be illegal, which is usually enough of a reason. Most of us just won't endorse something that "technically" works fine, but doesn't meet code. It's a liability thing, yanno?
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Old 07-26-2011, 03:28 PM   #15
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No Sheath Round 12/3 Wire


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Just curious but what are the negatives in that situation?
It's Really Really bad DIY Karma to do dangerous/not to code work.

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