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Old 12-09-2008, 09:19 PM   #1
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Carlon B121adj Plastic Box Cable Clamping


Hi.. I'm embarrassed to ask this question, but I don't see how the cable clamping device on this box could do much of anything. The little plastic
(1/2 " x 1/2 ") plate has 4 very tiny attach points and 2 of them are necessarily broken to allow the romex to be passed through. The gentleman at Home Depot said you are to push the tab against the romex and pull the cable tight, but I just don't see how it can be a reliable clamp. It looks more like a knockout to me. Do these boxes not require a clamping device? Also if the little tab/plate is removed you a left with a rather large hole to pass the romex through. Is it ok to have all that extra room where the romex passes through the clamp or knockout, or what ever it is?

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Old 12-09-2008, 09:41 PM   #2
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Carlon B121adj Plastic Box Cable Clamping


That is not a clamp, it is just a hole. The cable is to be secured by a staple within 8" of the box.

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Old 12-09-2008, 09:50 PM   #3
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Carlon B121adj Plastic Box Cable Clamping


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The gentleman at Home Depot said you are to push the tab against the romex and pull the cable tight,
Now that's funny, sad, but funny.
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Old 12-09-2008, 11:11 PM   #4
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Carlon B121adj Plastic Box Cable Clamping


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...The gentleman at Home Depot said you are to push the tab against the romex and pull the cable tight...
This "gentleman" would be correct--if you had bought a box with integral cable clamps. You can see the clamps here. The NEC allows NM cable to enter a single-gang box without a clamp, as long as it is secured within 8" of the box.
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Old 12-10-2008, 07:28 AM   #5
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Carlon B121adj Plastic Box Cable Clamping


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This "gentleman" would be correct--if you had bought a box with integral cable clamps. You can see the clamps here. The NEC allows NM cable to enter a single-gang box without a clamp, as long as it is secured within 8" of the box.
Does this rule apply to old work boxes?
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Old 12-10-2008, 08:08 AM   #6
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Carlon B121adj Plastic Box Cable Clamping


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Does this rule apply to old work boxes?
Old work boxes have integral/molded clamps, although those that are blue aren't worth a cr*p.
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Old 12-10-2008, 12:06 PM   #7
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Carlon B121adj Plastic Box Cable Clamping


You are looking at the knockout as a clamp which it isn't. The boxes that have the clamps are more obvious, they don't break free from the box too easily as opposed to the knockout.
I personally like the Super Blue boxes by Carlon which are a heavier gauge and I think all have integral Zip clamps.
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Old 12-10-2008, 06:06 PM   #8
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Carlon B121adj Plastic Box Cable Clamping


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Old work boxes have integral/molded clamps, although those that are blue aren't worth a cr*p.
Which ones would you recommend?

My local electrical supply shop, as well as the big box stores, only have the blue ones.
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Old 01-14-2009, 12:02 PM   #9
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Carlon B121adj Plastic Box Cable Clamping


I ran into a problem installing some of these super blue boxes. Having never used boxes with these integral clamps I broke several of them out on purpose assuming there was a separate clamp to install. When I went to get these clamps I discovered that I was supposed to use those tabs. After discovering that I tried to use them the way the brochure described and I have had many of them breaking off still (especially in the double ganged boxes) just trying to push them past the little tab that makes that clicking sound . When this happens do I have to scrap the box or is there a clamp available that I haven't found yet. Also on the boxes I broke the tabs out on already I was able to use another hole but now there is a giant empty hole. I will be very upset if I have to replace these considering one out of every three tabs I push through on the double ganged boxes breaks off. What are the chances an inspector will let it go considering they are all stapled within 8" anyway.
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Old 01-15-2009, 07:58 AM   #10
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Carlon B121adj Plastic Box Cable Clamping


Super blues are ok but the clamp is not very forgiving- when new it is very stiff, moving it around a bit can seem to make it too loose. I think you are only to have a few attempts with them before they eventually break off!
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Old 01-15-2009, 08:01 AM   #11
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Carlon B121adj Plastic Box Cable Clamping


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Super blues are ok but the clamp is not very forgiving- when new it is very stiff, moving it around a bit can seem to make it too loose. I think you are only to have a few attempts with them before they eventually break off!
Use Pass&Seymour/Legrand boxes and you won't have these problems.

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