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Surge protection - what should clamping voltage be for UK mains?


This may be a very silly place for this post, but was linked to this forum by someone at RS.

What clamping voltage should I have for a surge protection extension lead? For a PC in a residential home.
If peak voltage is 320v in the uk, should it be anything above this? Or will this wear out the protector?

Thanks for any help, or direction of where else to ask this.

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