I guess we all have an unanswerable question....so here is mine.
I am on a commercial job using premium grade receptacles, the kind with the screw-tightened wire clamp for the hot and neutral (so you can use stranded wire easily). Having used those properly, I find that the ground screw is a puny green screw, self-tapped into the frame of the receptacle. I find myself thinking that somewhere it must be written that a ground screw cannot have a wire clamp like the line and neutral screws. I think that, but I would sure like to read it for myself.
The mystery deepens when I install some twist-lok receptacles and lo...the ground screw does indeed have a clamp, identical to the line and neutral.
So I wonder....who is the terminal god? and where has he written that a ground screw cannot have a wire clamp?
And, in my incredulity, I have the obscene thought that the lack of a wire clamp on a premium wiring device is a cost-saving measure agreed upon by the manufacturers of these devices who have NO clue as to the needs of those who install these things by the millions out on the job. That just could not be....impossible.
Is there anyone...who can shed light on my terminal dilemma?