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
Office Buildings | Apr 21, 2015
Stop the endless debate over open vs. closed work environments
Rather than be confused by the constant stream of opinions, leadership teams contemplating workplace investments should start with powerful employee engagement strategies that drive results.
BIM and Information Technology | Apr 21, 2015
Software tools shouldn't dictate the AEC process
With over 200 solutions on the market, construction software is one of the most complex and fragmented markets, writes Gensler's Mark Thole.
Cultural Facilities | Apr 20, 2015
Jean Nouvel loses court battle against Philharmonie de Paris over alleged design ‘sabotage’
Nouvel boycotted the January opening of the facility and asked for his name to be removed from all references to the work.
Sponsored | Coatings | Apr 20, 2015
Removing graffiti without a trace
The issue of graffiti removal inspired Valspar scientists to develop a graffiti resistance system, which has been tested and approved
Contractors | Apr 20, 2015
Too many construction projects don’t meet owners’ expectations: KPMG report
Causes for delays, overruns, and underperformance include project management talent shortages, distrust between owners and contractors, and the lack of fully integrated project management systems.
High-rise Construction | Apr 17, 2015
Construction begins on Goettsch Partners-designed Nanning China Resources Center Tower
The tower's design is derived from its multiple uses, which include 170,000 sm of Class A office space, 5,000 sm of boutique retail, and a 45,000-sm luxury Shangri-La hotel.
High-rise Construction | Apr 16, 2015
Construction begins on Seattle's Tibet-inspired Potala Tower
Construction on the 41-story Potala Tower in Seattle finally kicked off following a ground-breaking ceremony seven months ago.
Building Team Awards | Apr 10, 2015
14 projects that push AEC teaming to the limits
From Lean construction to tri-party IPD to advanced BIM/VDC coordination, these 14 Building Teams demonstrate the power of collaboration in delivering award-winning buildings. These are the 2015 Building Team Award winners.
Building Team Awards | Apr 10, 2015
Prefab saves the day for Denver hospital
Mortenson Construction and its partners completed the 831,000-sf, $623 million Saint Joseph Hospital well before the January 1, 2015, deadline, thanks largely to their extensive use of offsite prefabrication.
Building Team Awards | Apr 10, 2015
Anaheim’s soaring intermodal hub
Anaheim's Regional Transportations Intermodal Center is the largest ETFE project in North America.