The rules of this part of IEC 60364 are intended to provide for the safety of persons and equipment in a LV system in the event of a fault between the HV system and earth in the HV part of transformer stations which supply low-voltage systems.
IEC 60364-4-44 Ed. 1.1 b:2003
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Electrical installations of buildings – Part 4-44: Protection for safety – Protection against voltage disturbances and electromagnetic disturbances CONSOLIDATED EDITION