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-   -   Cable clamp for 1/2 inch knockout and 10/3 romex? (http://www.diychatroom.com/f18/cable-clamp-1-2-inch-knockout-10-3-romex-172340/)

mikegp 02-18-2013 10:40 PM

Cable clamp for 1/2 inch knockout and 10/3 romex?
 
Having trouble locating what I need. I tried hd online chat and the guy was clueless. It's difficult to even search for this. I need a cable clamp for my inlet box with a 1/2 inch knockout. The 3/8 hole was too small. I thought of just dremeling it to be a little bigger, but don't know if that could cause a problem later on with a sharp edge touching the sheathing. Thanks for any help.

joecaption 02-18-2013 11:06 PM

http://www.homedepot.com/h_d1/N-5yc1...&storeId=10051

Is thiis what you looking for?
You can use a step drill if the hole in the panel needs to be made bigger.

frenchelectrican 02-19-2013 12:43 AM

For the half inch fittings the actual KO opening size is 7/8 inches so that is very common item and with standard NM connector as one of the guys left a link.,

The 10-3 NM will fit in there for only single cable

But if you used the 10-3 UF cable forget it you will need larger NM clamp for that cable. ( due it will be flat and pretty wide )

Merci,
Marc

mikegp 02-19-2013 02:49 AM

Quote:

Originally Posted by joecaption (Post 1120135)
http://www.homedepot.com/h_d1/N-5yc1...&storeId=10051

Is thiis what you looking for?
You can use a step drill if the hole in the panel needs to be made bigger.

That looks like it will work from the pic, but I have 3/8 ones here and the hole is tiny. I guess I'll just go check at the store. Thanks.

Jim Port 02-19-2013 08:07 AM

Is there a clamp already in the box?

mikegp 02-19-2013 09:01 AM

Inlet box just has a knockout. No clamps included.

mikegp 02-19-2013 09:43 AM

I just dremeled it out and it looks like it'll be fine. No sharp edges or anything. I appreciate the help.

rrolleston 02-19-2013 11:59 AM

It's required that you use a clamp to prevent the wire from getting pulled our or rubbing on sharp edges.

J. V. 02-19-2013 12:19 PM

Quote:

Originally Posted by mikegp (Post 1120193)
That looks like it will work from the pic, but I have 3/8 ones here and the hole is tiny. I guess I'll just go check at the store. Thanks.

You might have 3/8ths cable end, but they don't make 3/8 electrical male end connectors. 1/2" is the smallest trade size available/allowed.
You should use a trade size 3/4" connector or bigger for a 10/3 cable.
The 3/8 hole is a starter hole for a knock out or to drill it out.

Quote:

Originally Posted by mikegp (Post 1120284)
I just dremeled it out and it looks like it'll be fine. No sharp edges or anything. I appreciate the help.

Sounds good to me.

mikegp 02-19-2013 08:32 PM

I don't think I made clear what I was talking about. The knockout is 1/2 an inch, but the clamp has a smaller hole for the cable to go through before it can be tightened down. Hope that makes sense. Otherwise I'll post a pic.


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