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Detailed Lightning Protection System Inspections

It is recommended that all lightning protection systems be visually inspected at least once per year. In some areas where severe climatic change occurs, it might be advisable to visually inspect systems semi-annually, or following extreme changes in ambient temperatures.

Complete and in-depth inspections should occur on all systems every 3-5 years.

It is recommended that critical systems have an in-depth inspection every 1-3 years depending on occupancy and the environment where the protected structure is located.

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What You Can Expect from an HG Lightning Protection System Inspection

Visual inspection of Rooftop Components

  • Visual inspection of overall system condition – neat? dislodged or broken cables? etc.
  • Visually inspect all air terminals. Verify that size and quantity are sufficient for the project. Note all bent, broken or dislodged air terminals.
  • Verify that all lightning rods have been placed at 20ft maximum spacing around the roof perimeter and ridges.
  • Verify that lightning rods are within 2ft of the outer edge of the structure including corners
  • Verify that mid-roof air terminals are spaced at maximum spacing of 50ft in accordance with NFPA 780 Figure 3.8.1.2
  • Verify interconnecting mid-roof cables connecting mid-roof air terminals are properly spaced. Further verify 150ft  maximum length of cross-run conducted to the main perimeter or down conductor in accordance with NFPA 780 Figure 3.8.1.2
  • Verify copper materials are not mounted or in contact with aluminum materials.
  • Verify all conductors are fastened vertically and horizontally not more than 3ft O.C. maximum spacing.
  • Verify that metallic bodies of inductance situated within 6ft of the lightning conductor or another bonded metal body shall be interconnected to the lightning conducting system unless inherently connected.
  • Verify air terminals and bonding connectors are installed on rooftop, fans, ventilators, a/c units, etc, in accordance with NFPA 780/UL 96A
  • Remove and clean all cable connections including bonding plates, lugs, cable-to-cable connectors, etc.

Inspection of Lightning Protection Ground System

  • Locate all through roof connection to down runs or structural steel. Visual inspection for damage and tightness.
  • Verify the number of down runs/connections to ground is adequate per NFPA 780 and UL 96A
  • If the connection is to steel verify that connect is made in accordance with NFPA 780 and that area under the connection is free of grease, oil, paint, etc
  • Verify that the spacing of down conductors at the roof level is installed with accordance of NFPA 780 and UL 96A
  •  Visually inspect connections to rebar/structural steel, etc, for corrosion. Remove connections, clean, and reinstall. Replace as necessary.
  • Visually inspect ground rods and cable connections to ground rods. Remove connections, clean connection, cable, and rod.

Ground Resistance Testing and TVSS Responsibilities

  • Perform ground resistance on lightning protection grounding system using the “Fall of Potential” method. Record results and submit to the owner. Verify that levels are in accordance with the requirements of all applicable standards.
  • Inspect and document the status of surge protection/TVSS systems and equipment.

Fast Free Quotes on Lightning Protection Systems

Our lightning protection team is in high demand and covers half the country. When circumstances demand an in-person estimate we’re happy to arrive on location and draft a detailed estimate.

When we can’t be there modern technology allows us to use a state-of-the-art, satellite-powered measuring tool that produces tremendously accurate surveying capabilities.

You’ll get the same fast, detailed quote and of course, it is free of charge.

Get Your Free Estimate

Protecting your home, property, and business from lightning is our business. Our experienced lightning protection system technicians can assist you with all aspects of lightning protection, from inspection to risk assessment, to custom design, flawless installation, and regular maintenance of your system.

We provide lightning protection and surge protection systems to residential and commercial properties.

Our latest projects include single-family homes, condos, apartments, ranches, equine facilities, stables, racetracks, farms, barns, churches, trees, schools, hospitals, airports, factories, data centers, office buildings and more.

For more information or if you have any questions, feel free to give us a call. We look forward to hearing from you!

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