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how to calculate MCOV of a lightening arrester for a 33 Kv solidly earthed system
If you have to ask, are you sure you are qualified to install or service electrical equipment? My guess is no, you are not qualified.
So, after reading this:[PDF] Lightning Arresters, I hope that you will hire a competent electrician to perform the installation and service.
Remember, if you install the system improperly, you may kill someone.
lightening ≠ lightning
--Editor Crankshaft
Something tells me the OP won't know the difference.
Maybe he's looking for the UL® label.