First time posting so please forgive the newbieness.
I've been overlooking our company machine shop 3ph power supply. We have a 480/208 xfrmr (hung from ceiling so couldn't see the nameplate) supplying two panels marked 208 3ph 4W, those panels feed somewhere from 5 to 8 3ph machines (Hardinge lathes, Bridgeport mills, horizontal bandsaw, etc) and some 1ph loads. The nameplate on these machines is all 230V or 240V 3ph. Some are marked "Wired 230V" if they are fed straight to the multitap IM like on a manual Bridgeport mill. A quick check of NEMA motor voltages for "230V" says nominal voltage could be 220V-240V.
I can't find another xfrmr - could these "230V" 3ph machines be fed from 208V 3ph supply?
No opportunity to measure actual ph-ph voltage at machine since machinists were full bore.
Any insight into typical nominal voltages used for small 3ph machines is very much appreciated.
Thanks much
pete g.
I've been overlooking our company machine shop 3ph power supply. We have a 480/208 xfrmr (hung from ceiling so couldn't see the nameplate) supplying two panels marked 208 3ph 4W, those panels feed somewhere from 5 to 8 3ph machines (Hardinge lathes, Bridgeport mills, horizontal bandsaw, etc) and some 1ph loads. The nameplate on these machines is all 230V or 240V 3ph. Some are marked "Wired 230V" if they are fed straight to the multitap IM like on a manual Bridgeport mill. A quick check of NEMA motor voltages for "230V" says nominal voltage could be 220V-240V.
I can't find another xfrmr - could these "230V" 3ph machines be fed from 208V 3ph supply?
No opportunity to measure actual ph-ph voltage at machine since machinists were full bore.
Any insight into typical nominal voltages used for small 3ph machines is very much appreciated.
Thanks much
pete g.