On 08/07/2017 07:07 PM, John Andersen wrote:
There's a lot of mythology involved here as well: http://www.eetimes.com/document.asp?doc_id=1272972
I found one error in that article: "In North America, minicomputers frequently are designed to use a 208V 3-wire system. In this 3-wire system there are 2 hot wires and 1 ground wire (no neutral wire)." 208V is the voltage between any 2 phases of a 3 phase circuit, where each phase is 120V to neutral. I suspect they meant 240V. I have worked with a lot of minicomputers and the power supplies I saw were either 120V or 240V, single phase. However, the disk pack drives of that era often had 208V 3 phase power. BTW, the tape drives were 120V, to keep on topic. ;-) In the North American power system, local power feeds are from a centre tapped transformer that's connected across 1 of the 3 phases of a higher voltage line. This results in a 120/240V single phase connection to a home. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org