Posted by buickanddeere on November 05, 2011 at 09:39:17 from (216.183.136.182):
In Reply to: Re: OT generator posted by Shetland Sheepdog on November 04, 2011 at 16:49:54:
Delta secondaries are never ever used around here. 120/208 four wire, some rare 240/416 four wire, three wire 600V on very large services and 347/600 four wire. Only time we use 277/480 is on specific equipment not manufactured in 208V or 600V. There are some 600 to 277/480 delta-wye transformers around. Dual voltage 220/440 motors are uncommon but connected to 208V or 416V. They seem to operate ok. Have never ever seen a 208 transformer with a delta secondary. Always a wye to provide a neutral. 347/600V lighting panels are supplied from a transformer with wye connections. Usually the 347/600 neutral comes from the utility transformer's wye point. Or on occasion a 600V to 347/600 delta/wye transformer is mounted near the lighting panel. If the building is supplied with only 600V three wire from a very large service.
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