A retainer comprises at least two retaining straps or retainer screws and a retainer plate having a cord hole, a slot, and a plurality of retainer holes or retainer strap notches. The retainer maintains connection of an electrical power plug at an end of an electrical power cord to an electrical power receptacle when the retainer is installed. The cord hole and slot extend through the retainer plate, and the slot extends from an edge of the retainer plate to the cord hole. Each of the at least two retaining straps is operable to engage a retainer hole or retaining strap notch in the retainer plate and extend from the retainer plate around the electrical power receptacle and back to the retainer plate.