Each unused secondary winding must be grounded at one point. Never short-circuit a secondary winding as it can create very high current between the terminals which may prove dangerous for both- the personnel and the transformers. Grounding at more than one point in a connected instrumentation circuit results in circulating currents on the neutral wire. This causes a voltage drop and increases errors in measuring, or even a short-circuit in case both polarity wire and neutral wire are grounded at different points.
High Voltage Products
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