Posted by buickanddeere on December 23, 2008 at 09:34:19 from (216.183.136.2):
In Reply to: Re: Block heaters posted by IaGary on December 23, 2008 at 05:07:46:
120/208 from a wye seconday transformer is a scommon as dirt in malls, offices, small to medium businesses, large farms etc. In large business's etc. The 208 will come from a transformer with 600 delta primaries to 120/208 wyw secondaries. Lets you use ordinary 120V appliances and equipment. Most 240V equipment will run on 208V. Sometimes the winding taps on the transformer get upped a little. 130/228V never hurt anything. 347/600V three phase from a wye connection on secondary side of the utility service transformer is very common. About 1 amp per HP on three phase. Allows motors up to 200HP before getting into huge cables. Or having to go to 4160V or 13.8KV. You can carry a large amount of power a long way with only small cables using 600V. There was a trend for a couple of years in the 1960's in downtown Toronto and else where to go 240/416. One service to do everything. All the small loads were to be European style 240V office equipment. The motors in the mechanical rooms 416V three phase. The idea didn't go very far. Step down transformers added all over the place to obtain 120V. 440V US motors used as replacements instead of purchasing 416 equipment from Europe.
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