Protecting a facility from AC power line disturbances is a low cost investment compared to the potential for equipment damage and lost productivity due to downtime.
The IEEE Emerald Book recommends applying surge protection in a cascaded or two stage approach - at the service entrance and then downstream at the panel boards and critical loads. This comprehensive installation creates an effective shield from high-energy transients.
Both the IEEE Emerald Book and NFPA 780 recommend the use of surge protection as a part of a building's lightning protection system. Because the service entrance suppressor can only reduce and not completely eliminate the high-energy transient, a second surge protection device must be applied ahead of your critical equipment.
These mitigation devices should be utilized to address both noise and transient issues for the highest level of suppression.
The completion of this facility-wide installation provides both performance and cost advantages. By placing a surge protection device (SPD) at the service entrance and branch panelboards that feed external equipment like HVAC units, the building has an effective shield from high energy transients trying to make their way in from the outside. A second layer of SPDs located at key branch locations provides effective protection against internally generated disturbances, which are prevented from feeding back within the electrical system. The bi-directional nature of parallel SPDs allows one unit mounted at the panelboard to protect all circuits within the panelboard - a very cost-effective application.
Finally, point-of-use series suppressors are placed at critical loads like the fire alarm system, security systems, and computer rooms.
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PHONE: (678) 546-6780
Last Updated: 07 Jun 2004
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