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
| Feb 27, 2014
Target converts former prison dump into latest big-box store
Target's new San Rafael, Calif., location was built on the site of the former San Quentin prison dump.
| Feb 27, 2014
Open or private offices? It depends on the business plan
Open layouts are grabbing headlines as a hallmark of the new workplace—think the Google campus or Facebook's headquarters. And for smaller-scale operations, open designs are often lauded for being less expensive than private office plans. But does that mean all offices should have an open layout?
| Feb 27, 2014
12 facts about heat-treated glass: Why stronger isn’t always better
Glass is heat-treated for two reasons: the first is to increase its strength to resist external stresses such as wind and snow loads, or thermal loads caused by the sun’s energy. The second is to temper glass so that it meets safety glazing requirements defined by applicable codes or federal standards.
| Feb 27, 2014
Metal Construction Association introduces two Environmental Product Declarations
Two Environmental Product Declarations (EPD), one for Metal Composite Material Panels and one for Roll Formed Steel Panels for Roofs and Walls, are now available free of charge from the Metal Construction Association (MCA) on its website.
| Feb 27, 2014
Bluebeam Software launches Revu 12 for better field-ready document management and project collaboration
The latest version of the company’s flagship solution better enables users in document-intensive industries to digitally collaborate on project documents and more easily connect the office to the field.
| Feb 27, 2014
PocketCake lunches CPU designed for virtual reality simulations
The company's Virtual Reality Simulation Converter Assembly is three times more powerful than the average high-performance computer and allows for up to eight people to experience a virtual reality simulation at the same time.
| Feb 26, 2014
Adaptive reuse project brings school into historic paper mill
The project features nontraditional classrooms for collaborative learning, an arts and music wing, and a technologically sophisticated global resource center.
| Feb 26, 2014
Use this app to streamline safety inspections
Using the iAuditor app, one of our Skanska teams developed electronic reports that make safety inspections more efficient, and that make it easier to address any issues emerging from them.
| Feb 26, 2014
Startup PocketCake aims to bring virtual reality simulations to the AEC masses
Founded in 2012, the development firm offers custom virtual reality simulations for the price of a typical architectural illustration.
| Feb 26, 2014
Billie Jean King National Tennis Center serving up three-phase expansion
The project includes the construction of two new stadiums and a retractable roof over the existing Arthur Ashe Stadium.