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480V 3 Phase US industrial power • OEM Panels
A 480 3 Phase Wye power system is called 480V 3 Phase 4 Wire and 480Y/277V. These are technically more accurate because they refer to the neutral. The “4 Wire” in 480V 3 Phase 4 Wire refers to the neutral as 4th wire. The” Y” in 480Y/277V refers to the neutral as
How many wires are in a 277 volt circuit? - Quora
You’re probably talking about a 3-phase 277/480V wye (star) circuit, widely used in commercial and industrial establishments in North America. The voltage from each phase to neutral is 277V, and the voltage between any two phases is 277 * sqrt(3)
ELECTRICIANS! Need help with 277 volt wiring | NastyZ28
May 02, 2007Those are setup for a facility that has 277/480 volt 3 phase service. That's 277 to ground and 480 phase to phase (hot to hot). You have, in your house/garage, 120/240. 120 phase to ground and 240 phase to phase. No way to get a 277 volt ballast to strike a lamp at 120 volts. Check the ballest wiring diagram if they give you any alternatives.
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