Lightning Rods on Commercial Buildings: What Is Actually Checked During an Inspection?
A lightning rod is one of the few devices on a commercial building whose functionality is not normally apparent—it operates silently until lightning strikes the building. An inspection is therefore the only way to be certain in advance that the air-termination system, down conductors, and grounding will actually safely divert a lightning strike to the ground—and not just appear to be in good working order but fail when a real strike occurs.
A lightning rod (lightning protection system, LPS) is typically classified as dedicated electrical equipment in commercial buildings pursuant to Government Regulation No. 190/2022 Coll., which builds upon Act No. 250/2021 Coll., on occupational safety in connection with the operation of designated technical equipment. The technical scope of the inspection is defined by the ČSN EN 62305 series of standards, which replaced the older ČSN 34 1390 standard. The operator is required to maintain the lightning conductor in a inspected condition, just as with electrical installations—however, this is a separate inspection with its own scope, not part of the routine inspection of electrical installations.
If you’re interested in electrical system inspections in general, check out this article Inspection of Electrical Wiring in a Commercial Building — This text focuses specifically on the lightning rod as a standalone device.
A lightning rod is not the same thing as an electrical inspection
Although the electrical wiring and the lightning protection system intersect within the building—surge protectors are connected to the internal wiring, and grounding is often partially shared — but they are two separate, dedicated systems, each with its own inspection report, its own inspection schedule, and its own scope of inspection. An electrical system inspection does not, by itself, cover the lightning protection system, and vice versa. For buildings where both systems are managed by the same company, this means smoother coordination of inspection schedules in practice, not that it amounts to one additional inspection.
What Is Actually Checked During a Lightning Rod Inspection
A lightning protection system inspection consists of a visual inspection of the entire system and measurements that cannot be verified visually.
| Part of the audit | What’s Included |
| Collection System | Condition of the grounding rods, grating, and wiring on the roof; mechanical damage; corrosion; loose fasteners; and compliance with clearance requirements from edges and equipment on the roof. |
| Downspouts | The integrity of the downspout routes along the facade or within the structure, the quality of the connections, test terminals for measurement, and protection against mechanical damage within reach of people. |
| Grounding | Measurement of the ground resistance of individual grounding electrodes, condition and continuity of the grounding system, and corrosion of exposed parts. |
| Connections and Interconnections | Contact resistance of connections; continuity of the conductive path between the lightning protection system, down conductors, and grounding, as well as any connected metal structures on the roof. |
| Surge Protective Devices (SPDs) | If installed, their functionality and connection to the internal electrical system—the boundary between a lightning protection system inspection and an electrical system inspection. |
The inspection technician compares the measured ground resistance values with the limits specified by the standard and the project specifications—if the value is higher, this usually means that the grounding system needs to be reinforced, not that the lightning rod should be taken out of service immediately.
How often are lightning rod inspections performed?
The deadline is determined by the lightning protection class (LPS I through IV) specified for a particular structure in the design or by an inspection technician, as well as by the environment in which the structure is located. A general overview:
| LPS Class / Environment | Visual inspection | Complete revision |
| Classes I and II | Once a year | Once every two years |
| Classes III and IV | Once every two years | Once every 4 years |
| Environments with a risk of explosion or fire | Once a year | Once a year |
| Rule of thumb: The specific LPS class and the resulting inspection interval are determined by the inspection technician based on the building’s design and purpose. In addition to regular inspections, lightning protection systems also require one additional special inspection—after a direct lightning strike, a special inspection is always required, regardless of when the last regular inspection took place. |
Who Is Authorized to Inspect a Lightning Rod?
Inspections of lightning conductors, as designated electrical equipment, may only be performed by an inspection technician with the appropriate qualifications under Section 8 of Government Regulation No. 194/2022 Coll. and holding a certificate under Section 11 of Act No. 250/2021 Coll. — The same type of authorization is required as for the inspection of electrical installations, but it does not necessarily have to be the same person if the scope of their certification does not cover lightning protection systems. Before commissioning an inspection, it is advisable to verify the scope of the technician’s authorization, particularly for specific or higher classes of lightning protection systems (LPS).
The Risks of Not Having a Valid Lightning Rod Inspection
In practice, operating a lightning rod without a valid inspection has three main consequences:
• at an inspection by the State Labor Inspection Office poses the same risk as electrical wiring sanctions and corrective measures,
• In the event of damage caused by lightning or a resulting fire, the insurance company may reduce or deny coverage if the lightning rod did not have a valid inspection,
• Without an inspection, the operator has no independent way of knowing whether the system will actually protect the building, the equipment, and the people inside as intended in the event of a lightning strike.
Checklist: Are You Ready for Your Lightning Rod Inspection?
☐ Accessible roof collection system
A technician must be able to access all arresters, down conductors, and test terminals without difficulty.
☐ Previous Lightning Rod Inspection Report
It will allow us to follow up on the most recent status and verify that previous defects have indeed been corrected.
☐ Lightning Rod Design or Diagram
It corresponds to the actual condition of the building, including any roof modifications made since the last inspection.
☐ The Well-Known LPS Class
It is clear which lightning protection class the system was designed and inspected for.
☐ New Roof Technologies Reported
Photovoltaic systems, air conditioning units, or other accessories added since the last inspection are within the scope of that inspection and do not encroach on the protection zone of the lightning protection system.
☐ Designated Responsible Person
Someone is ready to cooperate with the technician and provide information about the building.
FAQ
Is a lightning rod required by law for a commercial building?
The requirement to have a lightning rod and to ensure it is inspected stems from the building’s design documentation and from the building’s classification under Government Regulation No. 190/2022 Coll. For commercial buildings, schools, healthcare facilities, or buildings with a risk of explosion, a lightning rod is typically a standard part of the design.
Do you have to call an inspection technician immediately after a lightning strike?
Yes. A direct lightning strike is grounds for an emergency inspection, regardless of when the last routine inspection took place—even a lightning rod that appears undamaged should be inspected after a strike.
Can the same technician perform an inspection of the lightning protection system as well as an inspection of the electrical wiring?
If his certification also covers this scope, then yes—in practice, this makes it easier to coordinate the schedules for both inspections. However, it is always necessary to verify the scope of authorization rather than assume it.
What if the inspection reveals high ground resistance?
This usually means that the grounding system needs to be reinforced or supplemented, not that the entire system should be taken out of service immediately. The inspection report sets a deadline for corrective action based on the severity of the findings.
Does the inspection remain valid automatically even after roof modifications, such as the installation of solar panels?
No. Any work on the roof that could affect the lightning protection system or the lightning conductor’s protection zone is grounds for adjusting the inspection schedule or requesting an unscheduled inspection, even if the regular inspection interval has not yet expired.
A lightning rod in the technical records—not just another piece of paper in a binder
A lightning rod is one of those devices for which it’s easy to lose track of the inspection date—it’s on the roof, out of the way of day-to-day operations, and its inspection report is often kept separately from the rest of the building’s technical documentation. That’s exactly what this solves INTECHI Client Portal:
• Tracking Deadlines — The system automatically tracks when the visual inspection and full inspection deadlines for your lightning rod are due and will notify you by email well in advance, even though this is a piece of equipment that’s easy to forget about.
• Pairing to a device card — The lightning rod has its own file, separate from the electrical wiring, containing its inspection history, measured ground resistance values, and identified defects.
• Automation of Follow-Up Steps — You can report any detected issue—such as the need to reinforce the ground connection—directly as a repair request; the INTECHI dispatch center sees it immediately and schedules a technician and an inspection.
• Importing CAD Files — You can upload a diagram of the lightning protection system and the layout of the down conductors directly into the system and link them to the equipment card, so that you have the necessary documentation on hand when renovating the roof or installing a photovoltaic system.
• Document Processing and Archiving — You have your inspection reports and earth resistance measurement reports in digital form, all in one place, and they can be retrieved for insurance purposes or audits.
How INTECHI Handles It
Is your lightning protection system inspection deadline approaching, or are you unsure which LPS class your system falls under? INTECHI provides turnkey regular and special lightning protection system inspections for commercial buildings—from the inspection itself, through defect remediation, to record-keeping in the client portal, where you have everything at your fingertips and under control. All inspection reports and other documents are then neatly stored in client area at service.intechi.cz.
