NEMA L21-30 Extension Power Cord - 10 Foot, 30A, 120/208V, 10/5 SOOW - Iron Box # IBX-5809-10 NEMA L21-30P Plug NEMA L21-30R Connector 10 Foot Length Rated for 30 Amps, 120/208V 10/5 SOOW Wire