... When is UL gonna lift the listing on "back-stabbing" as a method for device wiring terminations?? I just came from a trouble call(4 hours)at a residence where they lost power to the entire 2nd floor,..due to an old back-stabbed receptacle hidden in a closet... It's really a poor means of termination,and under load the poor connections overheat and can cause serious damage.. I issued a mandate to my guys stating that anyone caught terminating in this fashion WILL in turn be terminated..on the other hand,..it keeps us on our toes Russ
.."if it ain't fixed,don't break it...call a Licensed Electrician"
But how do you feel about the "modified back stab" - ie the holes in the back of the receptacles that allow you to insert stripped wire, and then tighten the side screw to tighten the "crimp plate" (for lack of a better term) on the inside?
I've seen these on GFCI's for several years now... also on a few receptacles. They seem more secure than the old "knife edge brass" versions ...
One might observe that those are two completely different, unrelated, termination techologies that are similar only in the characteristic that the termination mechanism is accessed through a hole in the back of the device.
I've seen a series of pictures from Wago to show three different methods of terminating a wire: A hole with a little spring, a simple screw in a hole to hold the wire and finally the "crimp plate" type. (The type where you place the wire under the head of the screw wasn't among the pictures). The "crimp plate" has the largest area in contact with the wire and a high enough surface pressure to make a good connection without damaging the wire very much.
I have used the captive screw tighten back stab devices and find them pretty good. But the same method is employed on most gfi outlets out there today. With gfi's the captive plate is so thin and cheap it sometimes does not hold the wire in place so well even if I super tighten the screw down. As far as back stabbing goes - whoever you are out there that does it- thanks for the many many service calls I have gotten which I fix in record time and get my 1 hour minimimum, and service charge. In the future could you guys not do it on the receptacles behind the heavy dressers? Your making my back sore.
I agree with you, Russ, and I certainly don't need a boss to tell me not to use the stab-locks. Knowing not to use them comes with experience in the field. I had a kid that used to work with me who swore he would not use the stab-locks but always did. Now he knows what section the classfieds are in.
A while ago, ( Not sure which code cycle) back stabbing of # 12 wires in a device was removed from the code. I am not sure if it was from the maufacture or UL or the NEC itself. You can still back stab ( as far as I know) # 14 wire in most of the house, but you can not backstab a # 12 wire any more.