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...Insulation resistance testing application note introduction testers can be used to determine the integrity of windings or cables in motors transformers switch gear and electrical installations test method is determined by type equipment being tested reason for ing instance when cabling switchgear low capacitance time dependent capacitive leakage absorption currents become insignificant decrease zero almost instantly a steady conductive current flow reached minute less providing perfect condi tions spot reading short more detailed information on tests see following sections what leak age predictive maintenance other hand long run cable large motor generator high installation depen most important second rea dent will last hours insure son these cause public personal safety protect prolong life meter readings change con performing dc voltage systems mo stantly making it impossible between de energized cur tors over years obtain an accurate read rent carrying hot grounded are exposed envi ...