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Need for Multiple Layers of Protections

Surge Protective Devices

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        A cascaded installation with Surge Protective Devices (SPDs), at the Service Entrance and downstream

and at the protected equipment Distribution and Branch Circuit panel boards, is required for effective surge

protection. This coordination, using multiple SPD units, provides a protective barrier, at the Service Entrance,

to protect from externally generated transients, i.e. lightning, utility grid switching, high winds causing

power line arcing, and electrical accidents. These sources represent a low percentage (less than 20%) of all

transient activity, but can be of typically higher magnitude causing immediate hardware damage to electrical

systems and destroying sensitive electronic equipment.



  WHY Surge Suppression?

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