How to Wire a Nema L14-20P Plug | Hunker The NEMA L14-20P plug/receptacle pair is designed for 240 VAC, single-phase service with a maximum current draw of 20 amps. Like all 240-volt plugs and receptacles, the L14-20P has two brass terminals for hot wires, a chrome terminal for a neutral wire and a green terminal for a ground wire.Author: Chris Deziel L14-20 Wiring Diagram A wiring diagram and power rating of the generator connector NEMA L14-20 120/240V-20A. Wiring Connector L14-20. The mating plug L14-30P is normally wired with #12 AWG. As usual, red and black leads go to X and Y, white to the neutral, and green to ground (refer to this diagram for the configurations of the terminals). Wiring Device NEMA Wiring - AutomationDirect PDF fileWiring Devices – NEMA Wiring Diagrams 600V AC 600V AC 600V AC G EQUIP. GR. L17-30R 3-Pole 4-Wire Grounding Continued 3ø 600V AC 18-15R 18-20R 18-30R1 8-50R 18-60R L14 30 Wiring Diagram | Wirings Diagram How can this diagram assist with circuit building? 30 Amp Outlet Wiring Diagram Elegant 20 Amp Twist Lock Plug Wiring – L14 30 Wiring Diagram. The diagram offers visual representation of an electric structure. On the other hand, the diagram is a simplified variant of this arrangement. It makes the process of assembling circuit easier. Connecting Portable Generator To Home Wiring: 4-Prong and Newer homes may have 4-prong 125/250V drier outlet NEMA 14-30R. It provides a separate ground hole besides L1, L2 and N (see diagram). For our task it has the right number of leads, but a wrong geometry. To connect a genset to such a receptacle one can replace the socket in the generator cord by a 4-prong plug NEMA 14-30P.