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As per the BS EN5 - Part4, we have to provide SPD's (Surge protection devices) from the protection of transient induced overvoltage (indirect lightning) to the internal equipment's.
If Incoming service line is overhead - Class I or Buried Class II SPD.
But why we have provide the co-ordination SPD for the internal equipment's. We are provide already at the incoming service lines for Class I or II.
If indirect lightning happened, service entrance SPD will protect to the system but what will do the co ordination SPD.
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