New answers tagged grounding
For the "why" part see example #1 from the Digital Museum of Plugs and Sockets, and more pictures on other pages. One common style of outlet in Japan has a separate screw connection for the grounding wire, usually under a plastic flap. For what to do: this toilet seat should be rewired to a standard three prong plug available at any hardware store (NEMA ...
What you need to do is replace the cord with a proper cord and install a US compatible plug of the proper voltage and amperage. Assuming this appliance is 120V, it should be plugged into a GFI protected receptacle. DO NOT just cut off or ignore the ground wire.
Metal lines connected by metal fittings to metal enclosures which actually have power connected to them, and therefore also have grounds connected to them - so, they already are grounded.
Are simple voltmeter will answer the question. At the outlet the TV is plugged into measure across the two prong holes, and then from each to the ground prong hole. There should be 120V from the narrow prong hole to the other two, and 0V from the wide prong socket to the ground hole. Any deviation from that indicates a problem with the AC wiring. If that ...
If you have an ungrounded system, the only safe and legal way of grounding it is to run all new cables. I have come across outlets that had a "fake ground", that is where the neutral is also connected to the ground screw. If the hot and neutral wires were swapped, which can easily happen on old cloth wiring where the white color has fallen off the neutral, ...
This is a very suspicious situation. Adding a proper ground to every receptacle in the house is no small feat, it's weird that the handyman just casually mentioned that he did it. I believe the only correct way to do it would be to run a new ground wire of the proper size back to the service panel where it can be connected to the grounding rods. Perhaps ...
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