Although I haven't measured it myself, Bjarney, my understanding is that the 265 volt measurement was phase-to-phase, not phase to ground. After spending a few hours online I'm wondering if this isn't a power quality problem. It's a tool & die shop with CNC machines and possibly a fair computer load with CAD for blueprints. I'm wondering if there are grounding problems, neutral problems, harmonics, and service load imbalance. I also read about installing a zig-zag transformer close to the load. Any thoughts?
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