Talked to Four Electrical Engineers on this. Answers all over the place. Two said bare ground wire off resistor to ground OK One said 600 Volt insulated to ground. One said 4160 volt (Same as Phase conductors to Ground ) I Personality think 600 volt insulated from load side of resistor to ground be fine. Any comments ?? This is an Impedance Grounded System per 250.186 NEC. Becoming more common in Industrial & Mining.
