fsmyth

Your description sounds like a 3-phase auto-transformer. Try 110v across two of the primary inputs (smaller wire in the windings). Use a ballast bulb like you have been. IF that works out OK, the try 110v across one input and the center-tap. This should give the correct voltage on the secondaries, assuming a 230v 3-phase winding on the input. It seems doubtful that it would be a welder transformer, since there would be no isolation on the output. <als>

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