Locking Plug Connection Orientation Straight Current Rating 20 A Housing Color Black White Housing Material Nylon NEMA Plug Configuration L21-20P Number of Blades 5 Number of Poles 4 Phase Three Polarized Yes Resistance Properties Chemical Resistant Impact Resistant Watertight Voltage Rating 120/208V AC Wire Connection Type Screw Terminals Wiring Style Standard Face Diameter 2.23 in For Maximum Cable Diameter 1.15 in For Minimum Cable Diameter 0.35 in Grade Industrial