“2 prong outlet. I have no way {currently} to know if it is grounded but I will go with no. Can I use this plug on a non-grounded outlet? I heard that if the outlet it not grounded, screwing in the grounding screw is pointless. Will it be safe?”
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I am not an electrician but I have a little bit of experience. Older houses with no ground use the neutral as their ground. Two prong plugs will have one of the prongs larger that goes in the neutral side as it's ground. If an outlet on an older house has a three-pronged outlet but that outlet is not wired to a ground itself it is useless as a grounded Outlet, using a grounding screw in the middle of the plate does nothing. I hope a real electrician sees this and critiques me and keeps me from doing anybody harm as well as myself LOL
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