Hey all, this might be a stupid question but here goes. Let's say I am using metal boxes with NM cable. The cable bushings I'm interested in using are Arlington 1/2", black in color. They are very thin and they protrude in to the box only about 1/4". So in essence, the clamping portion is INSIDE the box versus some of the other bushings that are about 1" long that keep the clamping portion on the outside of the box. I've read 314.16 a few times and it is pretty clear about clamps, but I haven't really gave much attention to theses little NM bushings. What do you guys think, count or not?
Volume allowance for clamps
- Thread starter torcho
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macmikeman
Senior Member
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- Planet macmikeman
Re: Volume allowance for clamps
You could try installing them backward and then pushing the complete cable run thru from the box opening after the clamp is installed.
You could try installing them backward and then pushing the complete cable run thru from the box opening after the clamp is installed.
- Location
- New Jersey
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- Journeyman Electrician
Re: Volume allowance for clamps
I find that some of these things are so ridiculous because they really lack logic. I'm going to deduct one conductor in a box for a piece of plastic that might encroach the inside of the box by 3/16" or 1/4" yet right next to it I have a 3/4" rigid conduit with an inch of thread into the box and a big plastic bushing on it and this doesn't require any deduction. I think that it's safe to say that the provision for keeping the "cable connector with it's clamping mechanism" on the outside was referring to an old style, two screw squeeze connector.
If someone is enforcing this with the Arlington type connectors than I agree with Physis that an exception is needed.
I find that some of these things are so ridiculous because they really lack logic. I'm going to deduct one conductor in a box for a piece of plastic that might encroach the inside of the box by 3/16" or 1/4" yet right next to it I have a 3/4" rigid conduit with an inch of thread into the box and a big plastic bushing on it and this doesn't require any deduction. I think that it's safe to say that the provision for keeping the "cable connector with it's clamping mechanism" on the outside was referring to an old style, two screw squeeze connector.
If someone is enforcing this with the Arlington type connectors than I agree with Physis that an exception is needed.
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