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Old 03-17-2014, 05:31 PM   #1
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Any tips for getting NM 12-2 cable through snap in clamps on junction box?


I'm trying to change out a 1 gang junction box into a 2 gang box. I bought an Arlington One Box for this, and I'm trying to feed one 12-2 NM cable through the top left knockout and two of those same cables through the right knockout. These boxes have those little round black cable connectors (just like these) that you push into the knockouts, and since this is old work and the last several inches of the wires in each cable have been separated and stripped, I'm having a heckuva time running the cables all the way through the clamps.

Any tips for doing that, particularly the hole where I have to get two 12-2 cables through the same connector? Should I put the plastic connector on the cable first and then try to snap it in (on my first tries, I couldn't get that to work), or snap the plastic connectors into the box first, and then run the wires and cables through (it seems to get caught up on the white insulation of the cable, when I get to that point)?

Any other tips? There is a bigger knockout I can use for the two cables to go through on the top right, but would have to run and buy a larger connector for it. But it seems like that's the only way it might work to get two cables in there.

Any advice would be appreciated!

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Old 03-17-2014, 05:40 PM   #2
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Any tips for getting NM 12-2 cable through snap in clamps on junction box?


Just use a,screwdriver to slightly open the prongs before inserting the old cable. Then slide the new cable in. It helps to leave the jacket on the cable until inserted and slide the cut piece off.

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Old 03-18-2014, 10:31 AM   #3
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Any tips for getting NM 12-2 cable through snap in clamps on junction box?


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Originally Posted by Jim Port View Post
Just use a,screwdriver to slightly open the prongs before inserting the old cable. Then slide the new cable in. It helps to leave the jacket on the cable until inserted and slide the cut piece off.
Thanks for the tip. So is it best to put the clamp on the cable before snapping the clamp into the knockout hole? Or put the clamp in first, and then run the cable through it and use the screwdriver trick?

Seems pretty tough to get two of these cables into one clamp in the smaller size hole. Is there a easier to use clamp I can buy that works better?
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Old 03-18-2014, 10:34 AM   #4
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Any tips for getting NM 12-2 cable through snap in clamps on junction box?


Put the clamp in the box first, then install the cables.
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Old 03-18-2014, 02:46 PM   #5
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Any tips for getting NM 12-2 cable through snap in clamps on junction box?


Would it be Ok to use a stress-relief style metal cable connector (the kind where you tighten two screws to clamp the cable down) on a plastic/fiberglass box? Seems like it would be easier to get the cables through there and then tighten it down.
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Old 03-18-2014, 02:51 PM   #6
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Any tips for getting NM 12-2 cable through snap in clamps on junction box?


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Would it be Ok to use a stress-relief style metal cable connector (the kind where you tighten two screws to clamp the cable down) on a plastic/fiberglass box? Seems like it would be easier to get the cables through there and then tighten it down.
Good question...

plastic box with ss romex squeeze connector???

I'll give it a thumbs down.
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Old 03-18-2014, 02:54 PM   #7
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Any tips for getting NM 12-2 cable through snap in clamps on junction box?


rx connector
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Old 03-18-2014, 02:54 PM   #8
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Any tips for getting NM 12-2 cable through snap in clamps on junction box?


strain relief connector
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Old 03-18-2014, 02:58 PM   #9
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Any tips for getting NM 12-2 cable through snap in clamps on junction box?


Sorry, got my terminology wrong. It's the RX connector that I was referring to. Is that OK to use on a plastic/fiberglass box?
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Old 03-18-2014, 02:58 PM   #10
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Any tips for getting NM 12-2 cable through snap in clamps on junction box?


Those things really beating you up.......

how about a plastic connector...?
They also have the same style, but there's a screw on the side instead of an insert.
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Old 03-18-2014, 03:00 PM   #11
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Any tips for getting NM 12-2 cable through snap in clamps on junction box?


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Sorry, got my terminology wrong. It's the RX connector that I was referring to. Is that OK to use on a plastic/fiberglass box?
I'd say no... ha ha ha...but again, good question..

I've seen it rearly and doesn't make sense
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Old 03-18-2014, 03:04 PM   #12
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Any tips for getting NM 12-2 cable through snap in clamps on junction box?


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Those things really beating you up.......

how about a plastic connector...?
They also have the same style, but there's a screw on the side instead of an insert.
Yeah, they are giving me a whuppin'! Can't seem to get two cables that have the wires separated and stripped through the plastic snap-in one.

Thanks for the tip on the other style plastic ones. Are they widely available at place like Home Depot?

Last edited by Studly; 03-18-2014 at 03:10 PM.
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Old 03-18-2014, 03:10 PM   #13
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Any tips for getting NM 12-2 cable through snap in clamps on junction box?


Sorry, you'll have to check....

I'm curious about your question. I'll find out and let you know..

The connectors you have now.......bend the heck out of the inside with a large screw drive... don't put a hole in your hand...be forceful....

Bend IT !!

shoot......break it ...get it in there!!
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Old 03-18-2014, 03:17 PM   #14
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Any tips for getting NM 12-2 cable through snap in clamps on junction box?


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Originally Posted by UnclePhil View Post
Sorry, you'll have to check....

I'm curious about your question. I'll find out and let you know..

The connectors you have now.......bend the heck out of the inside with a large screw drive... don't put a hole in your hand...be forceful....

Bend IT !!

shoot......break it ...get it in there!!

Yeah, maybe I'm too paranoid about breaking the prongs by bending them back too much. I'll give it another shot and add more muscle until the dang thing cries out for mercy!
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Old 03-18-2014, 03:19 PM   #15
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Any tips for getting NM 12-2 cable through snap in clamps on junction box?


Quote:
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Sorry, got my terminology wrong. It's the RX connector that I was referring to. Is that OK to use on a plastic/fiberglass box?
No, you would not be able to connect to the equipment grounding wire. The one box connectors are the way to go just do like Jim said by using a screwdriver.

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