We got a call from an old customer with a machine shop who had been a customer of my father,now his son runs the place.Motor burned out on a lathe,he had it rewound and a local electrician said the voltages were all wrong,motor would burn out.My daughter had a look, agreed,said the voltages to ground should be,120,or 208 phase to phase,she found 120 2 legs,208 1 leg,was puzzled,i told her,that's a center tapped delta,must be an m/g set somewhere,sure was,told her it's a high leg delta,just wire it up and it'll be ok,she did that,it worked,but slowed drastically under load,cause,one HRC fuse open,causing single phasing,this must be almost extinct in the US now,any thoughts on how this system developed?
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