Leviton 2521 Locking Plug 20A 277/480V L22-20P 4P5W

Product Description

The LEVITON 2521 is an industrial-grade locking plug rated for 20 amps at 277/480 volts in a 4-pole, 5-wire NEMA L22-20P configuration. Built from glass-filled nylon, it features a self-grounding design that simplifies installation and ensures a reliable ground path without a separate grounding jumper. The twist-locking blade configuration prevents accidental disconnection under load, making it well-suited for high-voltage three-phase applications where connection integrity is critical. Licensed electricians and industrial maintenance technicians are the primary installers of this device.

This plug is used in industrial and commercial facilities where three-phase 277/480-volt power distribution is required. Typical applications include temporary power drops on construction sites, machine tool connections on factory floors, and service connections for large HVAC equipment or motor loads. The L22-20P configuration is a recognized standard for this voltage class, and the 2521 is designed to accept cords ranging from 0.595 inches to 0.895 inches in diameter, covering most 12 AWG and 10 AWG multi-conductor cord sets used in these environments.

Key Features

• NEMA L22-20P locking configuration rated at 20A, 277/480V three-phase
• 4-pole, 5-wire design accommodates three-phase circuits with neutral and ground
• Self-grounding construction eliminates need for a separate ground pigtail
• Glass-filled nylon body resists impact and heat in industrial environments
• Cord grip accepts diameters from 0.595 inches to 0.895 inches
• Listed to UL 498, CSA C22.2 No. 42, NEMA WD-6, and ANSI C-73 standards

Compatibility

Designed for use with NEMA L22-20P locking receptacles and inlets in 277/480-volt three-phase, 4-pole, 5-wire wiring systems commonly found in industrial and commercial electrical installations.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize and lock out the circuit at the panel before terminating conductors. Verify cord diameter falls within the 0.595-inch to 0.895-inch range before assembling the cord grip to ensure a secure mechanical hold. Do not exceed the 20-amp continuous current rating of the device.