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Inspecting & Evaluating Damaged, Unsafe Lightning Protection Systems
- Examples & photos of damaged lightning protection system components
- How to inspect lightning protection systems
- Improper "abandonment" of lightning rods and ground conductor systems may actually increase the risk of lightning damage at a building
- UL publication 200-81 11/87 and other local service company information about lightning protection systems (lightning rodsd) and lightning strike hazards
- Underwriters Laboratory Standard UL96A requirements cover the installation of lightning protection systems
- Questions & Answers about visual inspection to detect unsafe lightning arrestor or protection systems
- References
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InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.
Examples & photos of damaged lightning protection system components & suggestions for how to inspect lightning protection systems
are outlined here. This article series describes common lightning protection systems, certification, installation, and lightning protection system inspection.
We provide information about lightning strikes, lightning hazards, related equipment, sources of lightning protection system installers, and lightning strike risk assessment. Our page top photo is of the remains of a lightning protection system found on a Poughkeepsie NY home built ca 1935.
Green links show where you are. © Copyright 2013 InspectAPedia.com, All Rights Reserved. Author Daniel Friedman.
Example of a Damaged Lightning Protection System
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We took these photographs of a damaged lightning protection system on an 1865 house in Orange County, New York. (Newburgh NY).
The
air terminal and conductor were bent down away from the top of the home leaving the chimney and roof (a metal one in an
area of frequent lightning strikes) unprotected.
This is an example of what can happen when someone who is not qualified works on the system.
The lightning protection
system for this home was dangerously compromised when the maintenance crew simply bent components down out of their way.
[The photographs of details of an old lightning protection system shown here were NOT the work of any of the
companies or sources described at this website.]
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Example of an Improperly Abandoned Lightning Protection System
The two photographs just below show the remains of the grounding connections for a lightning arrestor system that was installed on a Poughkeepsie New York Home.
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But our third photograph also shows trouble at each of the home's chimneys.
Leaving an incomplete lightning protection system on a building may actually be worse than having nothing at all, as especially combined with a masonry chimney (wet, conductive in a storm), a copper chimney cap, and a remaining lightning rod that is no longer connected to ground, this system may be saying to nature "go ahead, hit me!".
The arrow at upper left points to the lightning protection air terminal electrode, and the arrow at lower right in our photo points to the conductor cable that was cut off, perhaps by the roofers or by the house painters when they found that the lightning protection system wiring was "in the way".
We recommend removing rooftop electrodes and conductors that are no longer connected to ground, or if you believe that the original owner and installer felt that there was a reason for installing this system, it should be repaired by an expert.
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Inspection tips for Lightning Protection Systems
- Look for the UL certification label for the lightning protection system. Often this tag is screwed to the building wall
outside near where a main cable approaches ground level for connection to the ground rod.
- Look for documentation describing who installed the system and when it was last inspected
- Look for evidence of burned, damaged components that may have taken a lightning strike and need to be replaced or repaired
- Look for missing or loose components such as sections of cabling, air terminals, or connectors which may have been removed. In the
photographs above, a contractor working on the chimney simply removed and bent components of the lightning protection system to
get it out of his way. This house had a metal roof, a chimney now employing a metal cap and metal liner, and the property had a history
of recurrent lightning strikes on and near the building!
- If a "hidden" lightning protection system is installed you will not be able to find all of its components as some sections of
cabling may run inside walls or even inside chimney masonry. But look in the attic for grounding conductors, connections, etc.
- Look for a UL tag affixed to the building confirming that the lightning protection system components are UL-listed for that purpose.
- The Lightning Protection Institute (LPI) tests and certifies Professional Design/Inspectors for lightning protection systems.
- This list is incomplete - contributions and critique are invited. Contact Us
Frequently Asked Questions (FAQs)
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Technical Reviewers & References
Related Topics, found near the top of this page suggest articles closely related to this one.
- Portions of this information are based on UL publication 200-81 11/87 and other local service company information about lightning protection systems and lightning strike hazards.
- Special thanks to Associated Lightning Rod Company, Cooper Road Box 329A, Millerton NY who has been contributing technical content in presentations
to NY ASHI home inspectors since 1996. Some of that information [on lightning system material and installation details] was edited for clarity. ALRCi can be reached at 518-789-4603, 845-373-8309, 860-364-1498 and will inspect your lightning protection
system at no charge. [We have no financial nor any other business relationship with any company or product discussed at this website--DF]
- For more details on how lightning protection systems work, see Lightning Protection from Pacific Electric and Gas Company, and Electrical System Grounding and Lightning Protection, Engineering Technical Letter 90-6, Department of the Air Force, HQ USAF.
- Lightning strike risk assessment: for the full body of this excellent article which summarizes recent opinions about lightning
strike risk assessment and safe practices for individuals or groups needing to avoid being struck by lightning, see Updated Recommendations for Lightning Safety - 1998 Ronald L. Holle and Raul E. Lopez from National Severe Storms Laboratory,
NOAA and Norman, Oklahoma, Christoph Zimmermann Global Atmospherics, Inc. Tucson, Arizona
- As we indicated in an original version of this article, a lightning strike risk assessment guide can be found in Appendix I of the
National Fire Protection Association's Lightning Protection Code, NFPA #780.
The guide considers type of structure, type
of construction, structure location, topography, occupancy, contents and lightning frequency. Contact NFPA, Batterymarch
Park, Quincy, MA 02269 617-770-3000.
- Lightning Protection Institute, 3365 N. Arlington Heights Rd., Suite J., Arlington Heights IL 60004
- Underwriters Laboratory Standard UL96A. These requirements cover the installation of lightning protection systems on all types of structures other than structures used for the production, handling, or storage of ammunition, explosives, flammable liquids or gases, and other explosive ingredients including dust. These requirements apply to lightning protection systems that are complete and cover all parts of a structure. Partial systems are not covered by this standard. These requirements do not cover the installation of lightning protection systems for electrical generating, distribution, or transmission systems. These requirements do not cover lightning protection components, which are covered by the Standard for Lightning Protection Components, UL 96.
- Underwriters Laboratory Standard UL96: These requirements cover lightning protection components for use in the installation of complete systems of lightning protection on buildings and structures. These requirements do not cover the installation of lightning protection components. Products of this type are covered by the Standard for Installation Requirements for Lightning Protection Systems, UL 96A.
- "Lightning Awareness," Gerry Schulte, BMW ON magazine, June 2007 pp. 58-60, provided some technical details about lightning, and refers readers to www.lightningsafety.noaa.gov/outdoors.htm
Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair
 The Home Reference Book - the Encyclopedia of Homes, Carson Dunlop & Associates, Toronto, Ontario, 25th Ed., 2012, is a bound volume of more than 450 illustrated pages that assist home inspectors and home owners in the inspection and detection of problems on buildings. The text is intended as a reference guide to help building owners operate and maintain their home effectively. Field inspection worksheets are included at the back of the volume. Special Offer: For a 10% discount on any number of copies of the Home Reference Book purchased as a single order. Enter INSPECTAHRB in the order payment page "Promo/Redemption" space. InspectAPedia.com editor Daniel Friedman is a contributing author.
Or choose the The Home Reference eBook for PCs, Macs, Kindle, iPad, iPhone, or Android Smart Phones. Special Offer: For a 5% discount on any number of copies of the Home Reference eBook purchased as a single order. Enter INSPECTAEHRB in the order payment page "Promo/Redemption" space.
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 Armor Lightning Protection Inc Manchester Center, VT, 802-375-0266
state-of-the-art lightning protection and surge protection for residential and commercial buildings in Vermont, New England, and throughout the Northeast- Associated Lightning Rod Company, Inc., Box 329A, Cooper Road, Millerton, NY 12546 914/373-8309 518/789-4603
- A-C Lightning Security, Inc., 2100 East First St., PO Box 329, Maryville MO 64468 816-582-8115 800-821-5575 816-562-2932. In New York, Hudson Valley, contact Christensen Electrical Power Systems, Richard G. Christensen, 518-537-4128.
- Lightning Eliminators & Consultants 6687 Arapahoe Road Boulder, CO 80303 (303) 447-2828. "Engineering Solutions For Lightning, Grounding and Surge Protection Worldwide Since 1971"
- Electrical EINET
- Lightning Protection for Facilities, Dr. Bruce Gabrielson, Robert B. Marcus, Published and presented: EMCEXPO92, Washington D.C.
- MIT's Electrical Safety Files
- Lightning Protection for Workers What to Do if You're Outside in a Lightning Storm - Center to Protect Workers' Rights (PDF)
- 1998 and Current Lightning Protection Conferences & Exhibitions
- Lightning Risk and Hazard Analysis Measurement from the National Lightning Safety Institute (NLSI).
- "Lightning Fatalities, Injuries, and Damage Reports in the United States from 1959-1994", E. Brian Curran, Ronald L. Holle, Raul E. Lopez, NOAA Technical Memorandum NWS SR-193 October 1997
- UL - Underwriters Labs Lightning equipment certification program.
"Underwriters Laboratories Inc. (UL) has been testing and certifying lightning protection equipment since 1908. UL issues certificates of conformance for systems, inspecting system components and checking completed installations. Installations are required to comply with UL's internationally recognized Standards for lightning protection systems. Manufacturers, suppliers and installers demonstrate their commitment to safety by building,
selling and installing only those lightning protection products that pass UL's rigorous testing." -- (Op.Cit.)
- * Safety Hazards and Safe Inspection Procedures for Electrical and Home Inspectors at Residential Electric Panels
- Aluminum Wiring Information Website Aluminum Electrical Wiring Hazards and Repairs: in-depth authoritative info, photos, documents including selection of proper vs. ineffective repair methods. E.g.: Ideal 65 "Twister" purple connector fails in field and lab testing with aluminum wire.
- Electrical Panels, How to Inspect in buildings, safety for electrical inspectors, electrical panel, fusing, wiring defects, defective products. Inspection Class Presentation
- Lightning Strike Risk Assessment, Protection Systems & Services
- Multi-wire branch circuit inspection and defects
- Rust and Corrosion in Electrical Panels, A Study and Report on Frequency and Cause for Electrical and Home Inspectors at Residential Electric Panels
- Directory of Home Inspectors accessible via internet
- Electrical System & Wiring Hazard Inspection, Detection, Cause, Remedy, Prevention - Main Electrical Page
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