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cheater plug
A cheater plug, AC ground lifter or three-prong/two-prong adapter is an adapter that allows a NEMA 5-15P grounding-type plug (three prongs) to connect to a NEMA 1-15R non-grounding receptacle (two slots). The use of such an adapter avoids the need to replace receptacles, but is potentially hazardous, if the grounding tab is not connected to electrical ground.〔 An alternative identified in the US and Canadian electrical codes is to replace the outlet with a Ground Fault Circuit Interrupter (GFCI) breaker outlet.〔
Cheater plugs are also used to break ground loops in audio systems. This practice has been condemned as disregarding electrical safety.〔 An alternative is to use an isolation transformer made specifically for this purpose.
== History ==
Cheater plugs were previously available with a short flexible grounding wire rather than a screw tab. This allows use of the second duplex outlet that does not have a faceplate screw in the correct location for the screw tab. The grounding wire would be wrapped around the adapter to reach the faceplate screw. However, this ground-wire style of cheater plug was discontinued when it was noted that a loose unattached grounding wire could by accident become inserted into the "hot" blade socket of a nearby outlet, potentially leading to electrocution.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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