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?
