Originally Posted By: Stu_Rock
The following is speculation, but somewhere in your neighborhood, the power company probably brings in 480 V 3 phase delta (277 V to ground on each phase). Between each phase, they have one (or more) 2:1 transformer that steps down to 240 VCT that supplies several houses. Two other portions of your neighborhood are ±120° off from yours.
It's 7.2kV around here--and the transformer primary is usually connected between a phase and ground, not between two phases. In fact many residential streets only have a single 7.2kV phase wire on the pole.
The following is speculation, but somewhere in your neighborhood, the power company probably brings in 480 V 3 phase delta (277 V to ground on each phase). Between each phase, they have one (or more) 2:1 transformer that steps down to 240 VCT that supplies several houses. Two other portions of your neighborhood are ±120° off from yours.
It's 7.2kV around here--and the transformer primary is usually connected between a phase and ground, not between two phases. In fact many residential streets only have a single 7.2kV phase wire on the pole.
