Original poster: dhmccauley-at-spacecatlighting-dot-com I have a 3-phase 0-280VAC variac and i wasn't able to get any information from Powerstat regarding this, but thought someone might have an old catalog or something which might have the mounting bolt pattern dimensions for this thing. Powerstat Type 0116U-3 240VAC, 60Hz 0-280VAC 9A 4.4kVA Max Thanks dan