): The maximum permissible RMS power-frequency voltage that can be applied continuously across the arrester terminals. Rated Voltage ( Urcap U sub r
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) into the varistor blocks during lightning and line-switching actions. The selected device must possess a thermal rating ( Qthcap Q sub t h end-sub ) that safely exceeds this estimated energy load. 5. Calculating Protective Margins ): The maximum permissible RMS power-frequency voltage that