NEMA L15-20 Extension Cord Industrial High-Power Locking Extension Cord Works with a 20 Amp L15-20 Outlet and Inlet 20 Amp, 250 Volt 3-Phase 5-year Limited Warranty This AC WORKS brand extension cord [L1520PR] is a 20 Amp 3-Phase, 4-prong industrial high-power locking extension cord. The cable is an SOOW 12/4, 20 Amp copper with 600 Volt rubber jacket allowing it to stay flexible in extreme temperatures. This cord is popular for use with industrial and high-power equipment. Included with your purchase is a 5-year limited warranty. Note, de-rated to 18 Amps when the cable is longer than 50 ft. NEMA L15-20 Extension Cord Industrial High-Power Locking Extension Cord Works with a 20 Amp L15-20 Outlet and Inlet 20 Amp, 250 Volt 3-Phase 5-year Limited Warranty