VAX 780 on eBay

Jonathan Chapman lists at
Sat Jan 1 13:35:20 CST 2022

> I think that's the same with all the /computer/ equipment that I've seen
> which connects to 3ɸ power. A single phase could be used for all of it.

Computer exist which require three phase at a unit power supply level. It's often also used for large blowers if the cabinet(s) don't strictly require airflow from e.g. a raised floor.

> But I'm told that it's simpler / more economical (from a wiring /
> cable plant point of view) to deliver more power to the equipment as 3ɸ
> than it is 1ɸ.

It also saves you on current-carrying conductors for raceway fill calculations as long as your power factor isn't too bad.


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