Electrical Vehicle 14-50 plug charge from L6-20 250V power adapter. Molded with electroplated copper terminal in order to avoid surface oxidation effectively. NEMA L6 Series 3-prong 20 AMP twist lock L6-20P male plug. UL STW 12AWG*3C stranded conductor inner wire, support max 20 AMP loading. Heavy-duty 100% copper wire conductor inside.