53. When a high voltage system insulation test value is suspect or recorded during an annual survey, a polarization index test is performed. What is the polarization index?

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the polarization index is the ratio of the insulation resistance taken at ten minutes to the insulation resistance taken at one minute.

53. When a high voltage system insulation test value is suspect or recorded during an annual survey, a polarization index test is performed. What is the polarization index?

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