Abstract: A plug lock locks the plug of an electrical appliance with a receptacle connected to a source of electrical power. The plug lock has wall plate having a pair of openings. A sheath has a pair of ends with a first passage extending between the two ends. An extension extends from the first end of the sheath, the extension being removably receivable within the second opening of the wall plate. A protrusion is disposed within the first passage of the sheath. A plug has a pair of ends and has a second extension extending from a third and a second passage extending between the two ends, the third end of the plug insertable into first passage at the sheath's second end and passable therethrough such that the second tab of the plug passes over the protrusion such that the protrusions prevent reverse passage of the plug through the first passage.