Home Electrical Engineering Forum General Discussion Selecting Suitable Class of Surge Protective Device

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    Hi! I am designing 630A 400V (Phase to Phase) LV Distribution Circuit (Panel). For this panel, electricity directly come from a transformer through underground cable. There is no Surge Protective Device at the transformer (secondary side). Because electricity come from underground cable, what is the suitable class of surge protective device should I use at the incoming supply of the LV distribution panel?

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