The other benefit to 3phase power to something like a computer is that the filter caps required can be much smaller. Once you rectify three phases 60* you get MUCH less ripple because every 60 degrees you have a new peak arriving. When you have a real gas (electron) guzzler like one of these, DC filtering becomes an issue.
73 Eugene W2HX Subscribe to my Youtube Channel: https://www.youtube.com/c/w2hx-channel/videos -----Original Message----- From: cctalk <cctalk-boun...@classiccmp.org> On Behalf Of Jonathan Chapman via cctalk Sent: Saturday, January 1, 2022 2:35 PM To: Grant Taylor <cct...@gtaylor.tnetconsulting.net>; General Discussion: On-Topic and Off-Topic Posts <cctalk@classiccmp.org> Subject: Re: VAX 780 on eBay > 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. Thanks, Jonathan