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A question has come up as to the necessity of grounding the output side of a voltage transformer. The model in question is a Square D Industrial Control Transformer. Input voltage is 220vac, output is 120vac. If it is customary to ground one side (neutral?) of the output side, how do you know which side is Line and which is Neutral? Instructions on the unit do not mention the need to do this. Thanks for your assistance. Bob Dannenfelser Mottley Air Power Baltimore, MD [email protected]