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Old 11-12-2019, 04:10 PM   #1
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Cable setback rules, parallel to framing


I’d like to run ENT conduit horizontally from the service panel through framing members on the left side. But, the gap to the left of the panel has a 0.5” diameter white cable, plus two other cables, all vertical-run. I’ve read that the general setback rule requires parallel-run cables to be at least 1.25 inches from the face of the framing members.

I’m using ˝” ENT, so the minimum hole size is 1” (according to Carlon literature). To align with the desired knockout in the panel, the center of the hole will be 1.25” from the 2x4 stud face, leaving 0.75” from the edge of the hole to the face, to be protected by a nail plate.

Am I required to “stack” the 3 existing vertical cables to meet the general [NEC] setback rules, or are there exceptions? The original wiring in the wall to the left of the panel does not use any stacking devices, and the white cable generally hits the front wall, while the other two cables generally hit the plywood in the back.
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Old 11-12-2019, 04:26 PM   #2
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Re: Cable setback rules, parallel to framing


I wouldn't use ENT, but.....regardless....just use a nail plate then no clearance
is required.
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Old 11-12-2019, 04:38 PM   #3
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Re: Cable setback rules, parallel to framing


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Originally Posted by CodeMatters View Post
... just use a nail plate

I plan to use a nail plate for the horizontal ENT contuit. But, what do I use to protect the 3 vertical-run cables, which are much closer than 1.25" from the front or back edge of the 2x4 along the length of that stud?
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Old 11-12-2019, 04:53 PM   #4
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Re: Cable setback rules, parallel to framing


Cables routinely run close to the back of drywall in some places like where they
pass a plumbing pipe. Not something to worry about. Just do what you can by
moving them away from the stud and leaving them loose enough that they'll
tend to move when a nail or screw starts to push against them. Excessive
strapping is more likely to cause a problem than cure one, IMO. Also imo part
of why fished in cables are allowed.
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Old 11-12-2019, 05:13 PM   #5
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Re: Cable setback rules, parallel to framing


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I wouldn't use ENT ...


Would you use flexible metal conduit instead?
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Old 11-12-2019, 05:27 PM   #6
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Re: Cable setback rules, parallel to framing


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Would you use flexible metal conduit instead?

I may be missing something. Why use any conduit?
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Old 11-12-2019, 05:41 PM   #7
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Re: Cable setback rules, parallel to framing


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... Why use any conduit?

I understood that individual THHN wires [in conduit] have higher ampacity ratings than NM cable with the same gauge wires. For a 30A or 40A circuit, I thought that using thinner THHN wires would be an advantage, but then again, the conduit is a disadvantage to work with.
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Old 11-12-2019, 05:59 PM   #8
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Re: Cable setback rules, parallel to framing


Individuals do not have higher ampacity. Ampacity is (mostly) a function of
gauge and number of conductors per cable/conduit. Basic romex is nearly
always the best choice when running inside walls, ceilings, etc..
Up here I'd use nmd-90.....don't recall what the US equivalent is.....
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Old 11-12-2019, 07:20 PM   #9
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Re: Cable setback rules, parallel to framing


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... I'd use nmd-90 ...



On the mySouthwire website, I see the Romex NMD90 (for Canada) and the NM-B copper cable sold at US big-box stores (same gauge conductors, but ampacity is derated). I didn’t see a US-equivalent to your NMD90 – so perhaps they only sell the good stuff to you Canadians, or I should shop elsewhere...

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Old 11-12-2019, 09:21 PM   #10
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Re: Cable setback rules, parallel to framing


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On the mySouthwire website, I see the Romex NMD90 (for Canada) and the NM-B copper cable sold at US big-box stores (same gauge conductors, but ampacity is derated). I didn’t see a US-equivalent to your NMD90 – so perhaps they only sell the good stuff to you Canadians, or I should shop elsewhere...
Tell us what you are trying to do so we don't try and guess.
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Old 11-13-2019, 02:55 PM   #11
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Re: Cable setback rules, parallel to framing


Quote:
I didn’t see a US-equivalent to your NMD90 – so perhaps they only sell the good stuff to you Canadians,
NM-B is the US equivalent.

Don’t want to start a border dispute so all I will say is NMD90 doesn’t meet US code. A good CT permit inspector would red tag your job if he recognized it.
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