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
| May 7, 2012
Best AEC Firms: MHTN Architects nine decades of dedication to Utah
This 65-person design firm has served Salt Lake City and the state of Utah for the better part of 90 years.
| May 7, 2012
2012 BUILDING TEAM AWARDS: TD Ameritrade Park
The new stadium for the College World Series in Omaha combines big-league amenities within a traditional minor league atmosphere.
| May 7, 2012
2012 BUILDING TEAM AWARDS: Fort Belvoir Community Hospital
A new military hospital invokes evidence-based design to create a LEED-certified facility for the nation’s soldiers and their families.
| May 7, 2012
2012 BUILDING TEAM AWARDS: Audie L. Murphy VA Hospital
How a Building Team created a high-tech rehabilitation center for wounded veterans of the conflicts in Iraq and Afghanistan.
| May 3, 2012
2012 BUILDING TEAM AWARDS: Rush University Medical Center
This fully integrated Building Team opted for a multi-prime contracting strategy to keep construction going on Chicago’s Rush University Medical Center, despite the economic meltdown.
| May 3, 2012
U of Michigan team looking to create highly efficient building envelope designs
The system combines the use of sensors, novel construction materials, and utility control software in an effort to create technology capable of reducing a building’s carbon footprint.
| May 3, 2012
Best commercial modular buildings and marketing programs recognized
Judges scored entries on architectural excellence, technical innovation, cost effectiveness, energy efficiency, and calendar days to complete.
| May 3, 2012
Zero Energy Research Lab opens at North Texas
The living lab—the only one of its kind in Texas—is designed to test various technologies and systems in order to achieve a net-zero consumption of energy.
| May 3, 2012
NSF publishes ANSI standard evaluating the sustainability of single ply roofing membranes
New NSF Standard provides manufacturers, specifiers and building industry with verifiable, objective criteria to identify sustainable roofing products.