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Thanks that's helpful :)

Thanks for all replies, but I still do not have the idea about that. I tried to find out the length of the cable by a formula but I am still confused!! stevenal (Electrical)24 Jan 19 16:25 The last graphic is incorrect, since it fails to include the voltage drop across D (from Cuky's chart)...

Thanks for the reply. I think what I need is lead voltage calculation for surge arrester.

Hi everyone Regarding the installation of surge arrester, I tried to find some documents or standards but as they are not free my attempt was without results. In a power plant we have seen the surge arrester on the transformer have the earthing cable with the long of 10 m. the type of surge...