We got red power cables from ... back to the genset transfer switch, and I'm using "single phase" UPSes. My PDUs are also all C13 plugs so unless you have a C14 cord you can't really attach ...

While Apple hasn't directly addressed the power cable situation, it has said in support notes "The power cord is not ... The C14 inlet, which is used to accept the C13 connector, is too deep ...