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    earthing system(UK)

    Can anyone tell me that is there any connections with the earthing system between substations and consumers? Such as the substation use TT system, the consumers use TN-C-S, or TN-S, or TT. Is there any imperative rules to define that in 17th?
  2. S

    question about the earthing system

    If the 30/11kV Substation and 11/0.4kV substation choose TT system， can the earthing system of residential buildinguse TN-S or TN-C-S? Generally, the earthing system of the substation and consumers can be different?
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    Lighting protection of the TT system

    In the TT system, we all know that the socket outlets must be protected by RCCB, RCBO or ELCB. But for the lighting, is that necessary or forced that should be protected by RCBO? Is MCB ok? :twisted:
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