Never alter a plug to make it mate with another.
The outlet should be wired to a dedicated 20 amp240 volt circuit breaker in the service panel using 122 awg cable. A neutral wire normally white.
L14 20p Wiring Diagram Wiring Schematic Diagram
Wiring Of 480 Plug 4 Wire Wiring Diagrams
279 50 Amp 125 250 Volt Nema 14 50r 3p 4w Flush Mounting Receptacle Straight Blade Industrial Grade Grounding Side Wired Steel Strap Black
