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...April technical guideline tg insulation resistance testing determines the of test cable measurement is used to determine whether circuit will operate without excessive leakage current through when energized measured values can be impacted by certain external factors temperature moisture etc which may result in questionable readings even evaluated on a satisfactory length performed applying an elevated dc voltage conductor and measuring flow ground reference with known value calculated it important recognize that non shielded cables produce marginal results due inherent lack completely encompassing uniform plane over dielectric single reel determined if end user has means submersing while performing potential grounding other same duct as well possibly itself provides real life example around additional information found referencing megger s stitch time complete guide electrical setup connected equipment switches relays buswork transformers have lower ir than or not capable withstanding ...