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Cheater plug

Type of adapter / From Wikipedia, the free encyclopedia

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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).[1]:112 They are needed to allow appliances with 3-wire power cords to plug into legacy ungrounded (two slot) receptacles found in older buildings. 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.[2][3] These adapters are illegal in some jurisdictions, in particular throughout Canada.[4] A safer and more reliable alternative identified in the US and Canadian electrical codes is to replace the outlet with a Ground Fault Circuit Interrupter (GFCI) breaker outlet.[3]

A cheater plug, with metal grounding tab (lower right). The ground tab is designed to be attached to the outlet faceplate screw, which is supposed to be connected to the building electrical ground.

Cheater plugs are also used to break ground loops in audio systems.[5] This practice has been condemned as disregarding electrical safety.[5][6] A safer and more reliable alternative is to use an isolation transformer made specifically for this purpose.

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