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Old 04-22-2013, 03:15 AM   #1
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NEC on connector clamps for panel


Hi there,

I'm adding quite a few 12-2 (7 of them) and 14-2 NM cables (two) into the main panel.

Have a question on the NEC/UL code for connector clamp sizing on the main electrical panel.

What connector clamp type/size (e.g. 1/2" or other size KO) allows multiple NM cables (gauge size and how many), etc.


I have a bunch of 3/8" clamps w/ 1/2" KO, but I heard that size clamp only allows one cable to feed thru'. Is that true? Which type/clamp size would work w/ 2x 12-2 NM cables (or more)?



Thanks.


Last edited by joemc3; 04-22-2013 at 03:31 AM.
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Old 04-22-2013, 04:05 AM   #2
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NEC on connector clamps for panel


Many typical 1/2" NM clamps will allow for 2 flat xx-2 type cables. Check the package.

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Old 04-22-2013, 05:21 AM   #3
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NEC on connector clamps for panel


http://www.aifittings.com/products/spec-sheets/NM94.pdf


These are great connectors, check out the PDF file for cables allowed in each connector.
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Old 04-22-2013, 05:49 AM   #4
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NEC on connector clamps for panel


Quote:
Originally Posted by Jim Port View Post
Many typical 1/2" NM clamps will allow for 2 flat xx-2 type cables. Check the package.
Some even accept three 2-wire cables.
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Sometimes I feel like if I answer any more questions it is like someone trying to climb over a fence to jump off a bridge and me giving them a boost.
Answers based on the 2008 & 2011 NEC. If you're on the '14 already I feel sorry for you.
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Old 04-22-2013, 05:53 AM   #5
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NEC on connector clamps for panel


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Originally Posted by Speedy Petey View Post
Some even accept three 2-wire cables.
I haven't seen those, but I normally don't have the box to check for the ratings.
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Old 04-22-2013, 06:30 AM   #6
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NEC on connector clamps for panel


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I haven't seen those, but I normally don't have the box to check for the ratings.
I only know this because I checked online. I don't think I've ever looked at the box.
IMO if it fits it works.
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Sometimes I feel like if I answer any more questions it is like someone trying to climb over a fence to jump off a bridge and me giving them a boost.
Answers based on the 2008 & 2011 NEC. If you're on the '14 already I feel sorry for you.
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Old 04-22-2013, 07:22 AM   #7
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NEC on connector clamps for panel


Also check out the T&B 3200 & 3201.



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All responses based on the 2011 NEC.
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Old 04-22-2013, 04:30 PM   #8
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NEC on connector clamps for panel


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Also check out the T&B 3200 & 3201.



I honestly cannot stand those connectors, they are a PITA, from install to removal...
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Old 04-23-2013, 10:17 PM   #9
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NEC on connector clamps for panel


Quote:
Originally Posted by stickboy1375 View Post
http://www.aifittings.com/products/spec-sheets/NM94.pdf


These are great connectors, check out the PDF file for cables allowed in each connector.
Well, didn't this post just make my day! My panel is full of those and I had speculated that they weren't necessarily acceptable for panel applications. However, rather than replacing outright (major pita too), I thought I would just wait for the subject to come up some day while surfing forums. Sure enough, about 10 years later, here it is!
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Old 04-24-2013, 10:25 AM   #10
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NEC on connector clamps for panel


BTW, which kind of connector/clamp would take 3 cables? The NM94/NM95/NM96 can only take 2 cables max.
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Old 04-24-2013, 10:35 AM   #11
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NEC on connector clamps for panel


Quote:
Originally Posted by stickboy1375

I honestly cannot stand those connectors, they are a PITA, from install to removal...
I like them and have even using the for over thirty years without problems. To each their own.

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All responses based on the 2011 NEC.
If you live in New Jersey click here. All other states click here.
Please check with local, county and state officials as laws may vary.
Sizing motors here. Online motor calculator here. Online calculators here.
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