[TZ] 3 phase power

[Gary Glaenzer]

277 is to 480 phase-to-phase what 120 is to 208 phase-to-phase

in other words, if you have a 480 Wye incoming, you have 277 each phase to 
neutral

very handy as you can run many more fluorescents per 20-amp breaker as in a 
large store

also neatly gets around the 'no greater than 300 volts between adjacent 
devices in a box' restriction in the NEC

From: "Steve Lewis" <steve at theengineeringbureau.com>
>
> Dare I ask about 277 volt lighting circuits?  I wasn't there at the time,
> but an "electrician" once put a 120 volt florescent light fixture on a 277
> volt circuit and when switched on apparently made for an interesting show 
> J