Three phase and IBM

Eric Smith eric at
Sun Mar 20 04:57:45 CDT 2011

Philip Belben wrote:
 > ISTR seeing 277V somewhere as well.  This would be 160V phase to earth
 > - I have no idea what, if anything, uses that!

I suppose there could be such a thing, but here in the US, when people 
talk about 277V it is usually phase-to-neutral, with 480V 
phase-to-phase.  This is common in industrial use, both for heavy 
equipment and 277V lighting (fluorescent, sodium, or metal halide).


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