As I have a 240VAC NEMA 6-20 outlet in my ham shack, I purchased a "plug-and-play" C13615P-6 power cord from www.cables.com ($12.00 plus $6.45 shipping). The female end of this power cord plugs directly into the rear AC input connector on the KPA500. The C13615P-6 NEMA 6-15 plug fits either a 6-15 or 6-20 NEMA outlet. Phil - AD5X