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when electrical equipment is damaged from a transient peak power surge, does the damage occur when the power cuts off or when it reinstates, or can it be from either.

I have tv co-ax cable bunched with mains wiring cables running through the holes drilled in the joists in my house. Is this ok, or should it be taken out and re-routed away from them? Can this be a likely cause of tv reception interference?

I am informed that as my electric incoming mains is a TNS type (cables metal sheath), as opposed to a modern PME (earth to neutral connection) I should get an earth rod and main RCD incommer fitted. Is this correct?