Lightning Alley is not just a catchy name for a street or the local bowling lanes. It's the name dubbed to a notorious region in central Florida that is in the heart of the most lightning-prone area in the entire country. And that lightning strike may come at the most inopportune time.
Not only can this force of nature cause bodily injury and severe damage to property, it also has the power to disrupt or destroy a police department's 9-1-1 communications system, which is intended to assist residents during an emergency. That's exactly what happened in the middle of one Florida storm.
When a Walmart in the city of Bushnell was relocated, the facility was donated to the county for their use. The Sumter County Sheriff's Department decided to open its new offices in this building, including housing its emergency communications there.
One serious problem was that the electrical system was built for a 1970's vintage department store, not a critical communications and public safety facility. During one lightning storm in particular, the 9-1-1 system failed, leaving county residents without police, fire or ambulance response.
Inspection of the existing electrical system showed that it was badly flawed, mainly due to improper connectors and poor bonding and grounding. The communications tower, for example, had its own independent and inadequate grounding. The emergency generators and building structure were all independently grounded, each with its own ground rod, exposing its poor design. The main grounding electrode consisted of a single galvanized steel rod from the 1970s, with very high resistance to earth.
A new system was designed and installed for under $40,000, a minimal cost considering the value of the equipment protected, and improved public safety it brought to the residents of Sumter County.
"To be effective, the entire grounding system needs to be properly designed, using listed connectors and corrosion resistant materials," said Dave Brender, National Program Manager for the Copper Development Association, CDA. "Lightning protection systems in particular must be well-grounded to work properly, and could make matters worse if they are not. Copper and its alloys are the most common materials in use for this application because they provide superior corrosion resistance and avoid oxidation problems at connections.
Copper is also easy to install and durable," Brender added.
Central Florida is not the only region in the U.S. affected by severe weather. Similar 9-1-1 and broadcast facilities are employed in areas all over the country where communications is critical and the chances for lightning strikes are quite high. Having proper copper-based grounding and bonding should be a top priority where an entire system can get crippled by lightning.
Related Stories
| Sep 20, 2013
August housing starts reveal multifamily still healthy but single-family stagnating
Peter Muoio, Ph.D., senior principal and economist with Auction.com Research, says the Census Bureau's August Housing Starts data released yesterday hints at improvements in the single-family sector with multifamily slowing down.
| Sep 20, 2013
Public owners have mixed opinions regarding integrated delivery: Mortenson study
Mortenson Construction has released "Integrated Delivery: A Catalyst for Collaboration and Teamwork." The free report summarizes findings from a large group seminar conducted by the contractor at the 2013 AIA Public Architect Workshop, which was held in conjunction with this year's AIA National Convention.
| Sep 20, 2013
Perimeter roof edge: The first line of defense in a wind event [AIA course]
Aside from the roof membrane itself, the perimeter roof edge is the most critical component of the roofing system. As such, it warrants more scrutiny when designing a roof system.
| Sep 19, 2013
What we can learn from the world’s greenest buildings
Renowned green building author, Jerry Yudelson, offers five valuable lessons for designers, contractors, and building owners, based on a study of 55 high-performance projects from around the world.
| Sep 19, 2013
6 emerging energy-management glazing technologies
Phase-change materials, electrochromic glass, and building-integrated PVs are among the breakthrough glazing technologies that are taking energy performance to a new level.
| Sep 19, 2013
Roof renovation tips: Making the choice between overlayment and tear-off
When embarking upon a roofing renovation project, one of the first decisions for the Building Team is whether to tear off and replace the existing roof or to overlay the new roof right on top of the old one. Roofing experts offer guidance on making this assessment.
| Sep 19, 2013
Calling all young AEC leaders
If you're an up-and-coming leader at your AEC firm and are interested in advancing your career, join the BD+C editorial team at our 3rd Annual Under 40 Leadership Summit, Oct. 9-11 in San Francisco.
| Sep 19, 2013
BIM 2.0 and Google Glass: Science fiction or coming attractions for a job site near you?
Todd Wynne of Rogers-O’Brien Construction is one of only 8,000 people around the globe granted a pair of Google Glass for testing. Here's what he's been up to with the technology.
| Sep 18, 2013
Annual SteelDay to include 125 free events around the U.S.
Hosted by the American Institute of Steel Construction (AISC), its members and partners, SteelDay invites the AEC community and the public to see the contributions the industry has made in the design and construction of steel buildings and bridges.
| Sep 17, 2013
SMPS Foundation announces new business development research book
The SMPS Foundation has released its latest research book, A/E/C BUSINESS DEVELOPMENT – The Decade Ahead.