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Protect equipment and installation from lightning

Practical implementation

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Electrical Installation wiki


Acti9 surge arresters:


Surge Arrest power strips :


Surge arrester must be fitted at incoming point of the main switchboard

  •  between protective earth and all live conductors (neutral included)
  • In parallel with main breaker or distribution busbar.

Surge protection in large buildings


Surge arrester is effective for loads located up to 10 meters away, along the distribution lines.

If some sensitive loads are further from main switchboard , an additional close protection is required.
 Either of :

  • a surge arrester of type 3, located in a nearby switchboard
  • a power strip with integrated surge protection