It is IEC 60320. There are some cable providers who will use a UL exception to IEC to get to 15A, though most power supply vendors won't do that. But that is inlet power. At 80% efficiency, even with that exception, you get 1200W out. If you use the exception and you get to 90% you could see 1350W. I wish I had kept the melted IEC cable from a previous server company when someone used an "exception" supply with a normal PC IEC cable. The cable was coiled, it melted through its own cover, shorted to itself. It burned off and, when it cooled, the wall plug-to-melt portion made a nice lasso with the loop. There was no fault in the supply. Just trying to draw 15A through a 10A cord.