Originally Posted by feathermerchant
Remember that there is a transformer in the power supply. It just operates at something like 20kHz instead of 60Hz. A transformer can short primary to secondary making for high voltage on the output side.
These are datacenter PSU's - on some of the most commonly used equipment in the world. 240/110V to output is bad news for these and we would surely hear a lot about them since this is a definite outage and data loss scenario.