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
3D Printing | Dec 7, 2018
Additive manufacturing heads to the jobsite
Prototype mobile 3D printing shop aims to identify additive manufacturing applications for construction jobsites.
Architects | Sep 14, 2018
We’ve entered the golden age of brain science. What does it mean for AEC firms?
New research from the SMPS Foundation explores the known principles and most recent research surrounding the human brain and behavioral science. The goal: to discover connections between the science and the AEC business.
Building Owners | Jul 17, 2018
Are we facing a new era in Foreign Direct Investment?
The construction industry is already feeling the effects of the recent tariffs, not only with higher steel and aluminum prices, but with higher prices on Canadian lumber.
Codes and Standards | Jul 17, 2018
NIMBYism, generational divide threaten plan for net-zero village in St. Paul, Minn.
The ambitious redevelopment proposal for a former Ford automotive plant creates tension.
Office Buildings | Jul 17, 2018
Transwestern report: Office buildings near transit earn 65% higher lease rates
Analysis of 15 major metros shows the average rent in central business districts was $43.48/sf for transit-accessible buildings versus $26.01/sf for car-dependent buildings.
Adaptive Reuse | Jul 9, 2018
Work, park, live: Inside Cincinnati’s parking garage turned lifestyle hotel
The Summit hotel and conference center is a converted parking garage that was once a factory.
Accelerate Live! | Jun 24, 2018
Watch all 19 Accelerate Live! talks on demand
BD+C’s second annual Accelerate Live! AEC innovation conference (May 10, 2018, Chicago) featured talks on AI for construction scheduling, regenerative design, the micro-buildings movement, post-occupancy evaluation, predictive visual data analytics, digital fabrication, and more. Take in all 19 talks on demand.
Multifamily Housing | Jun 13, 2018
Multifamily visionaries: KTGY’s extraordinary expectations
KTGY Architecture + Planning keeps pushing the boundaries of multifamily housing design in the U.S., Asia, and the Middle East.
| Jun 11, 2018
Accelerate Live! talk: Regenerative design — When sustainability is not enough
In this 15-minute talk at BD+C’s Accelerate Live! conference (May 10, 2018, Chicago), HMC’s Eric Carbonnier poses the question: What if buildings could actually rejuvenate ecosystems?
| Jun 11, 2018
Accelerate Live! talk: The smart jobsite — Predictive visual data analytics for proactive project controls
In this 15-minute talk at BD+C’s Accelerate Live! conference (May 10, 2018, Chicago), a trio of experts in predictive visual data analytics presents how design-build giant Clayco has leveraged this technology to achieve production efficiency on several construction sites.