IEC 60071 is a two-part document that applies to three-phase AC systems with a highest voltage for equipment above 1 kV. The standard specifies the selection of the rated withstand voltages for the phase to earth-, phase-to-phase- and longitudinal-insulation and deals with the selection of insulation levels for equipment. The purpose of the document is to ensure if insulation breakdown occurs due to an overvoltage event the failure will happen at a predetermined position away from personnel and be relatively simple and inexpensive to repair.
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