IEC 61330 Ed. 1.0 b:1995

Specifies the service conditions, rated characteristics, general structural requirements and test method of prefabricated substations, which are cable connected, for alternating current of primary rated voltages above 1 kV and up to and including 52 kV1, and for a transformer of maximum power 1 600 kVA, for service frequencies up to and including 60 Hz.