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In order to provide maximum protection efficiency, it is necessary to create a «coordination» diagram, that means installation of a «primary » SPD at the network entrance and a «secondary» close to sensitive equipment.

This association is required in the 2 following cases :

High sensitivity equipment : Improvement of protection level.
Long distance (greater than 30 m) of wire between equipment to be protected and primary SPD :

Reduction of ringing voltages created during the surge transmision. Efficient SPD coordination is performed by including between primary and secondary SPDs :