CSS is a type tested assembly comprising an enclosure containing Medium Voltage (MV) switchgear, Distribution transformers, Low Voltage (LV) switchboards, connections and auxiliary equipment.

CSS is for energy transformation in secondary distribution network from MV to LV or LV to MV systems.

These substations are typically installed in locations accessible to the public and should ensure protection for all people according to specified service conditions

All CSS components shall be type and routine tested per their relevant product standards