By Hubbell Wiring Device-Kellems, this secure black locking receptacle is a terrific option to keep powered up and safe. This locking receptacle has a L7-20R configuration with a voltage of 277VAC and an amperage of 20. It has 2 poles and 3 wires. It is made of thermoplastic elastomer material. This has a grade of industrial. It has 1 phase. This locking receptacle has a corrosion resistant. A flush mounting allows for utmost usability. Standards include: UL/CSA.