The E-Safe "Lock-A-Plug" completely encloses the plug from any accidental reconnection. The electrical cable is inserted through the opening and then closed. The single entry (LP110) or multiple entry (LP550) locking system avoids usage by unauthorized personnel during critical times. The E-Safe is a practical and positive protection system. Made of polypropylene plastic which means it is totally dielectric and resists cold or hot temperatures up to 300F. LP110 accepts 110 VAC and certain models of the 220 VAC plugs (up to 1 3/4" x 1 3/4" x 1 3/4") with a maximum cable diameter of 1/2". LP550 accepts 220 VAC and 550 VAC plugs (up to 3" x 3" x 6 3/4") with a maximum cable diameter of 1". Both styles have a sliding closure design with integrated multiple lockout.