Grounding Receptacles in a Home with AC cable.
Quick question for you guys,
This question is for a home that was built in the 1970's and uses AC cable. I know that the cable armor functions as the ground and works just fine as long as it is clamped down properly. It appears that back in the 70's when they installed all of the original outlets they did not use any ground wires to ground the outlets to the electrical boxes themselves. I assume this is because the screws holding the outlets complete a ground path into the box, which is bonded to the AC cable armor. Is this method still acceptable? If I install a new outlet, or GFCI for that matter, do I have to do anything to ground it, or are the screws holding the outlet enough? :confused: Somehow I think I already know the answer, but the 1970s electrical boxes don't have grounding screws, so clamps would be needed I assume..?