I went to a Job site Checked the voltage on a 480 volt service No neutral. From Each phase to Ground I got 277 volts. I called the power company asked them Why I got Voltage to Ground on a ungrounded System ?? . Perhaps I had a Y with no netral brought in. They told me its stray Voltage and would collapes When a load was applied?? Has any one ever heard of that.? If its a Y I told them a Neutral is required. I should be able to put each phase to Ground one at a time IF its a true ungrounded Delta Right!
