Grounding conductor not wrapped around device terminal screw

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marylander

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Plant engineer
In this Leviton video, the ECG is simply placed under the receptacle's grounding terminal, without wrapping around the stud; in my experience, an uncommon practice. Does UL permit this practice for all wiring device grounding terminals? None? Some?
 
marylander said:
In this Leviton video, the ECG is simply placed under the receptacle's grounding terminal, without wrapping around the stud; in my experience, an uncommon practice. Does UL permit this practice for all wiring device grounding terminals? None? Some?
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It depends on the devices construction, many are made to just slide the egc under a pressure plate or screw.

Roger
 
Rephrase: Can anyone tell just from the video with no other information whether UL likely intended this practice to be acceptable for the product shown in the video?
 
Maybe it is because I work at a hospital and use hospital grade devices....but I haven't wrapped a wire around a screw in a very long time. I also haven't used solid wire in a very long time so that is part of the equation.

I'd crimp on a terminal before I wrapped stranded around a screw because it is just faster and easier than the methods that work for such practice.
 
Welcome to the forum.

Yes, commonly done on that kind of terminal, which has a pressure plate the wire goes under, as Roger said.

In fact, all of the terminals allow straight-in wiring.

Look at bottom-right corner; you can see what looks like a loop under the screw head:

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marylander said:
Rephrase: Can anyone tell just from the video with no other information whether UL likely intended this practice to be acceptable for the product shown in the video?
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Backwired means backwired, no looping required.
I think I have seen at least 4 different methods, all listed by UL.
 
Larry, on closer inspection, in the video there does indeed appear to be a pressure plate under the grounding terminal, which would automatically permit back-wiring on that terminal. Thanks.
 
marylander said:
Rephrase: Can anyone tell just from the video with no other information whether UL likely intended this practice to be acceptable for the product shown in the video?
Click to expand...
I would say yes, and clamping terminals probably make a more reliable termination than a wire hook on a screw.
 
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