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

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

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

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