Is the plug shown in the photo, which looks like IEC 320 but with angular tips, standard? If so what is it called?
Apparently, there are HP server power supplies that have a non-standard connection.
They are found on ParallelMiner as KT-1200-200V-1 for example.
We use a custom 12inch power cord to bypass the proprietary AC plug
Behold the custom cable:
It's just a cable with quick-connects.
Apparently this is the 277VAC version of the power supply:
HP 1200W Common Slot 277VAC Hot Plug Power Supply Kit (717359-B21).
The plug and socket are called LS-25 and LS-26. (an adapter is sold by stuartconnections)
HP also sells adapter TK801A and TK802A.
If you take a look at IEC World Plugs, it does look similar to an IEC Type I male connector, however, one of the blades is rotated 90 degrees.
My guess is that it is a proprietary connector to avoid the possibiility of connecting the supply without a cable from the manufacturer.