I had to replace a 15amp/125v two slot receptacle. This was very old (both hot and neutral slots were "T") and I replaced with same rating new two slop receptacle. I wanted to put in a three-prong outlet, but understand I should not do so without an attached ground. When I moved in I hired an electrician who rewired and properly ground most outlets, but must have missed this one.
The unusually helpful fellow at Home Depot told me I could still install a three-prong outlet as long as I attached a ground wire from the outlet grounding screw to the metal box housing the receptacle. I purchased the wire and ground screws for this purpose. When I removed the old receptacle, I discovered that the metal box did have holes in the back but the holes were too big for the ground screws I purchased. My questions:
1. Is this in fact a safe procedure?
2. Can I use a larger ground screw or a washer or something to facilitate the ground screw attaching to the back of the box - if so what sort should I use?
3. Is there a muh better way?
You folks helped me once before - thank you so much