General Calculations Excerpt from PRYSMIAN'S Wire and Cable Engineering Guide

Voltage Rating
The selection of the cable insulation level to be used in a particular installation shall be made on the basis of the applicable phaseto- phase voltage and the general system category as outlined below: 100 Percent Level - Cables in this category may be applied where the system is provided with relay protection such that ground faults will be cleared as rapidly as possible, but in any case within one minute. While these cables are applicable to the great majority of cable installations that are on grounded
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