This part of IEC 60071 applies to three-phase AC systems having a highest voltage for equipment above 1 kV. It specifies the procedure for the selection of the rated withstand voltages for the phase-to-earth, phase-to-phase and longitudinal insulation of the equipment and the installations of these systems. It also gives the lists of the standard withstand voltages from which the rated withstand voltages are selected.

This document describes that the selected withstand voltages are associated with the highest voltage for equipment. This association is for insulation co-ordination purposes only. The requirements for human safety are not covered by this document.

Although the principles of this document also apply to transmission line insulation, the values of their withstand voltages can be different from the standard rated withstand voltages.

The apparatus committees are responsible for specifying the rated withstand voltages and the test procedures suitable for the relevant equipment taking into consideration the recommendations of this document.

Cross References:
IEC 60071-2
EN IEC 60071-2
EN 60099-4
IEC 60038
IEC 60099-4
IEC 60060-1
EN 60060-1
EN 60038
IEC 60507
IEC TS 60815-1
IEC 60633
EN 60507
IEC Guide 108
EN IEC 60633
IEC 60050-614:2016


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