Advice on cable clamps

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  #1  
Old 02-13-10, 10:18 AM
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Advice on cable clamps

When I use boxes with internal clamps like the one on the right of the picture,

By oscarbravo, shot with KODAK Z712 IS ZOOM DIGITAL CAMERA at 2010-02-12

no matter how careful Im ,the cable does not stay in the center of the clamp and moves to the side of the hole pushing agains the sharp edge

By oscarbravo, shot with KODAK Z712 IS ZOOM DIGITAL CAMERA at 2010-02-12

I dont know if this is the way the clamps sopousse to work or if this will damage the jacket/insulation

I found other boxes with clamps that have a prong on each end[left on the picture] and keep the cable centered .
Im wondering now if I should replace the clamps in the boxes I previously used or this is not a problem
Thank you
 
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Old 02-13-10, 11:48 AM
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use a plastic or fiberglass box if they are allowed...save you the headache
 
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Old 02-13-10, 12:49 PM
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In my opinion the biggest problem is with the clamps being over-tightened. Not a lot of pressure on the cable is needed to firmly hold it in place and this type of cable jacket is fairly robust. If you donít get carried away when tightening the clamp then you should have nothing to worry about.
 
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Old 02-14-10, 12:04 PM
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Clamp

There is probably some rule against this, but you could try a one inch long piece of cable under the other side of the clamp to level the clamp. Keep it inside the box so you do not need to remove the knock-out.
 
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Old 02-14-10, 02:31 PM
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If you are really concerned then get some electrical rubber tape and take a turn or two around the cable where the clamp will be. The rubber tape will self-vulcanize and provide all the cushioning you would ever need.
 
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Old 02-14-10, 07:32 PM
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I don't think this is an issue. Those style boxes and clamps have been used for years. I have not heard of any problems from their use.
 
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Old 02-15-10, 09:44 AM
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Thank you for all replies much apppreciated!!!
I guess my lack of experience makes me overcautious
Regards
 
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Old 02-15-10, 11:26 AM
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They are no problem as long as the clamp is not overtightened. The clamp should be just tight enough so the cable doesn't move under light tension, but no tighter. To test if it's tight enough tug the cable with only your thumb and forefinger to see if it slides.
 
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