The recommended practices in the United States for lightning protection systems (LPS) have been the NFPA 780 Standard for the Installation of Lightning Protection Systems and UL96A Installation Requirements for Lightning Protection Systems. IEEE has also developed standards and guidelines, as well as a few other entities including the DOE and FAA for specialized applications.
Most applications that we see in the United States in which a specification is provided include NFPA 780 and UL96A. It is almost as if it is “boiler plate”.
You could attempt to go after the company that designed it, installed it, or did both. But they will tell you they followed the standard. What more do you want them to do?
We often get calls from companies, such as power generation plants, chemical plants and data centers, that tell us they have issues with lightning. It is amazing the number of times when we investigate these sites and perform consultations and site surveys, how many of these facilities have a “certified” LPS system already installed. They even have a UL Master Label plaque attached to some structures in the facility.
The customer asks us to “fix their problem” (which we do). They often ask “does your recommendation meet NFPA 780 and/or UL96A”. We tell them no, not completely and also remind them that the system they currently have installed at their facility does meet NFPA 780 and/or UL96A. The next comment out of their mouth is typically “yea, what did that get me?”
First off, let’s discuss what the NFPA 780 and UL96A have in common: Franklin Rods, lightning rods, air terminals.
A brief history and description follows.
In 1755, Dr. Benjamin Franklin experimented with lightning mitigation. He found that a sharp point dissipates charge (fundamental of a charge transfer system or CTS). He linked lightning to a charge and attempted to dissipate the charge in the clouds during a thunderstorm. Because of the experimentation he did with these “lightning rods”, they became known as Franklin Rods, utilized in a Franklin System which includes the necessary grounding and hardware to make them work. He found that if the lightning rod was the preferred collection point of the lightning leader, he did discharge the entire static field uncontrollably, with thousands of amperes of current flowing through the conductor in sub-second durations. The lightning rod isn’t always guaranteed to collect the lightning, which is another problem.
These Franklin Rod devices were applied to protect livestock and people from direct lightning strikes by providing a “preferred collection point”. That is: lightning would strike a metal rod attached to a structure suspended above the “protected” area, and a ground wire would (hopefully) conduct the excessive lightning currents to earth ground. Because the Franklin Rods were physically attached to the structures, in many cases, the structure would actually burn or sustain damage.
According to the UL96A document, “a (lightning) strike can exceed 300,000 Amperes, over one giga volt (one billion volts) and with temperatures as high as 36,000 deg. F.”
The Franklin approach brings the severe lightning energy (a 50-percentile strike in the U.S. is 30,000 amps) too close to critically sensitive, sometimes explosive environments and the susceptible electronic systems that control and monitor these environments. Even if the collection or lightning “strike” does not directly contact a portion of a system or circuit, the secondary effects of lightning (earth current transients, atmospheric transients, secondary arcing, electromagnetic pulse or EMP and ground potential rise or GPR) can degrade system components leading to premature failure and possibly cause false or erroneous operation.
Lightning Eliminators and Consultants, Inc. (LEC) does not follow the traditional approach of lightning protection by providing a “preferred lightning-collection point”. The Franklin Rod systems that have been in existence for over 250 years create the problem. They attract lightning to an area when the lightning may have well terminated outside the desired safe zone. In our view, they create a potential problem where one might not have occurred.
For over 40 years, LEC has been providing advanced industrial strength lightning protection systems worldwide. The systems LEC designs, manufactures and applies do not provide the traditional Franklin Rod protection schemes. Rather, we take the view we should avoid the strike, not collect it.
LEC’s name is somewhat of a misnomer; LEC does not eliminate all lightning. LEC’s charge transfer system (patented as the Dissipation Array®System or DAS®) uses a naturally occurring, scientific phenomenon called point discharge to prevent the collection of lightning within a finite protection zone. LEC does not attract the lightning. LEC’s system lowers the static field in the protected area long enough for the lightning strike to terminate outside the protected area. The DAS is engineered to the specific application or site.
The typical clients who choose the DAS system for their facility lightning protection are those that cannot tolerate any collection of lightning within the desired protection zone. The operation of the protected facility is too critical or sensitive to take the chance that a strike will be collected such as a physically explosive environment or where downtime will be too costly. Others choose our approach because the initial downtime will cause an extended restart period for repair and system checks or processes that are interrupted by the initial lightning strike cannot be reset and will require disposal or waste that cannot be reused. Another strong reason to choose DAS is personnel safety in an area that must be occupied during storm activity such as surveillance and security availability. These are a few of the mission-critical issues that have caused our clients to choose LEC’s unique patented approach.
The list of clients that choose LEC’s DAS is extensive. A portion of that list includes global clients such as: Exxon Mobil, Shell Oil, Chevron, Valero Refining, BASF, FedEx, UPS, Tennessee Valley Authority (TVA), Florida Power & Light, South Carolina Electric & Gas, Duke Energy, Entergy, Fidelity National Information Services, Turner Broadcasting, International Paper, Weyerhaeuser Company, US Navy, and the Israel Defense Forces. And these customers are repeat customers often with multiple facilities in different geographic locations across the world all protected by LEC’s DAS.
With over 70,000 system-years of actual in-field operation and proven success in minimizing the effects of lightning, LEC is the smart risk-reduction choice for critical systems’ lightning protection.
You have choices in how you protect your assets. The current standards in NFPA and UL96A Standards in lightning protection are not mandatory.
Contact us to discuss what your options are.