Application of Surge/Lighting Arrestors

     Transient over-voltages and surges on a facility's electrical system can be produced by lightning, switching, ground faults and other conditions.  Limiting these surges to an acceptable level requires proper application of surge arrestors at all levels of the electrical system, including both the interior and exterior distribution system.  Arresters installed with in a facility may be overwhelmed and destroyed by surges induced on incoming distribution lines if that portion of the system has not been adequately protected.

     At a minimum, appropriate class surge arrestors must be provided at the power transformer supplying the facility and in the facility's main distribution panel or switchgear.

DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
WASHINGTON DC 20330-5000
Engineering Technical Letter (ETL) 90-6

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Last Updated: 07 Jun 2004
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