Hey Gary, no problem and I enjoy sparky chats...As I said if EITHER the metal box orrrrrrrrr the receptacles green grounding screw is grounded then BOTH are grounded due to the fact the receptacles metal mount strap is electrically connected to the green grounding screw BUT BEST I RECALL FROM MANY NEC UPDATE SEMINARS THATS NOTTTTTTTTTT PERMISSIBLE.
Now I could be wrong and its been yearssssssss since I attended those every three years (when a new code was published) NEC Update Seminars, but I seem to recall Joe McPartland and Mike Holt (true NEC experts) preaching that was best and proper and NEC required.
BUT THINK ABOUT IT Its easy to imagine the two small top and bottom receptacle mounting screws getting loose in which case there could be a resistive ground connection orrrrrrrrr if the box ground screw is loose and a short is to the box (easy to happen) there could be a resistive link and if theres no attachment right to the receptacles green grounding screw the circuit may not have a good ground. If you don't ground BOTH the box and receptacles screw and rely on the two loose small mounting screws one could easily end up not well grounded.
You can see where I'm coming from, I think the NEC requires it but even if it didn't I always specified a green/bare equipment grounding conductor be properly attached to BOTH the box and green receptacle screw as otherwise youre relying on a couple weak and easy to come loose small top and bottom screws
THATS WHY I PREFER BOTH BE DIRECT GROUNDED that's my story n Ima stickin to it (and think the NEC agrees)
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