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(again, hoping to help someone or another) Two prong receptacles in old wiring connect one prong to the "hot" lug at the service and depend on the bonding between the neutral lug and the ground lug at the service entrance so that the neutral wire is also the path to earth ground. The receptacle has a cover that is attached to the receptacle itself by a small (#6-32) screw. This screw is electrically connected to the neutral and can serve as a "separate" ground lug. To power a device with a three prong plugs to a two prong receptacle, get an adapter (about a dollar at any hardware store). Note the plug for your device fits in at one end of the adapter and the other end of the adapter has two prongs and a small (usually green) tab. Some adapters' prongs are "modern" such that the neutral prong is wider than the hot prong. Some two- prong receptacles accommodate such adapters, and some do not--they present connections for two, similarly sized prongs, both small. It's probably good to buy an adapter with two small prongs (not only will it fit all receptacles, you can turn it "upside down" to try to reduce noise or shock hazard. The (green) tab attaches to the plate cover screw. Before you plug the adapter in, remove the screw, then plug in the adapter, then screw back the plate cover screw through the (green) tab. This not only gives your device a pseudo-separate ground path, it fastens the adaptor to the socket, providing pretty good strain relief. On 02/08/2015 12:14 PM, Hermann Meyer
wrote:
Old buildings didn't use grounds, they just have 2 cords and use the second as ground and backline. In German this is called Nullung. |
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