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Specifications: Type: Single Receptacle. Standard: NEMA WD1 and WD5, UL 498. Voltage rating: 3-phase 480 AC V. Connection: Screw Terminals. Material: Thermoplastic. Amperage Rating: 20A . Number of Poles: 3 . Number of Wires: 4 . NEMA Rating: L16-20R . Wire Size: #14AWG to #12AWG . Mounting: Screw mount. Environmental Conditions: Indoor dry unless protected by additional means . Application: Heavy Duty . Color: Black Features: . Visible NEMA ratings. Nickel plated receptacle strap. High impact-resistant chemical-resistant nylon face. Reinforced thermoplastic polyester base. Rivetless copper alloy contacts and blade. Nickel plated steel mounting yoke. Withstands 3000 V per UL498 dielectric voltage. 600 VAC or 250 VDC maximum working voltage. Capable of withstanding a fault level of 1000 A circuit, per UL 498. Maximum 30° C temperature rise at full rated current after 50 cycles overload at 150% rated current for either AC or DC applications per UL 498. Minimum 4.8 times rated current for 100 cycles overload. Terminals identified in accordance with UL 498 (Brass, White, Green). 14 to 8 AWG solid or stranded copper wire. Ratings and NEMA identification are permanently marked on device