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On the Hill/Around the Nation
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NEMAVoice
Wednesday, May 23, 2012
feature story
Lightning Protection System—Ultimate Line of Defense
by Mark S. Harger, Owner/President, Harger Lightning & Grounding
from electroindustry (ei) Magazine

Lightning protection devices include (left to right, starting in the back) lightning conductor on reels, in aluminum and copper; copper air terminal with universal copper base; decorative finial (air terminal); aluminum air terminal with universal aluminum base; one-bolt parallel connector; copper adhesive cable holder; and bonding plate. Courtesy of Harger Lightning & Grounding.Lightning, one of nature’s most destructive forces, continues to wreak havoc on lives and property especially in today’s electronic environment. On average, a lightning strike contains approximately 50 million volts carrying 18,000–20,000 amperes of current, but strikes with up to 300 million volts and 200,000 amps are not that uncommon.

To protect against this destructive phenomena, a properly designed and UL-listed lightning protection system is required. The National Fire Protection Association (NFPA) 780 Standard for the Installation of Lightning Protection Systems defines a lightning protection system as "a complete system of strike termination devices, conductors, grounding electrodes, interconnecting conductors, surge suppression devices and other connectors or fittings [that] are required to complete the system."

How does this system work? Picture a hockey goalie protecting his net. He has four basic tools—gloves, mask, stick, and pads— that help him prevent the puck from entering the net. Just like a goalie, there are four main parts that comprise a lightning protection system.

[ Continued ]

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On the Hill/Around the Nation

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International News

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Market Comments by Tom Robinson
It’s clear that we still have not figured out at the policy level how to get ourselves out of the doldrums. In fact the best thing might be no action, just let the economy find its own way. In any event that option is not on the table, and the economy remains weak. read more...

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2012 National Electrical Manufacturers Association. eiXtra is a biweekly e-newsletter for electroindustry professionals summarizing key manufacturer, standardization, and regulatory news. NEMA does not sell or release subscriber's personal information and will never willfully disclose individually identifiable information to any third party without first receiving your permission. Privacy policy.
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