In preparing to take insulation resistance readings on a main generator, the windings should be grounded for about 15 minutes prior to the test. For what reason should this be done?

Question

Accepted Answer

release any residual capacitive charge from the windings

Answer

allow accurate zeroing of the meter

Answer

help the windings to cool to ambient temperature

Answer

help the windings to cool to the same temperature as the ground test connection

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