Lightning Protection System
Lightning protection system confirms whether a building and its electrical and electronic installations are protected by an external and internal lightning protection system, as queried in property and electronic equipment insurance proposal forms.
- Category
- Fire protection
- Data type
- Yes/No
- Risk drivers
- Severity, Frequency
- Underwriting impact
- Premium, Condition/Warranty, Exclusion
Typical proposal-form questions
- Is the building fitted with an external lightning protection system (air-termination, down-conductors, earthing) matching its lightning protection level?
- Is internal lightning and surge protection installed to protect electrical and electronic installations against transient overvoltage?
- When was the system last inspected, and are inspection intervals aligned with the risk class of the building and its contents?
Evidence
- Lightning protection system design documentation
- Inspection and test reports
- Surge protection device installation records
Why it matters for underwriting
A direct or nearby lightning strike can ignite a fire, damage structural elements, and, through the associated surge, destroy electrical and electronic equipment across an entire installation almost instantaneously. Because lightning risk correlates with location (exposed sites, tall structures, elevated terrain) and occupancy (electronics-heavy operations, flammable storage), underwriters use the presence and design level of lightning protection to differentiate accounts that share similar construction and use but face materially different loss potential from this single peril.
Capturing the attribute and evidence
Proposal forms ask whether an external system (air-termination network, down-conductors, earthing) and internal surge protection are installed, and to which lightning protection level the system was designed. Underwriters look for the design documentation specifying the protection level chosen for the building’s risk class, inspection and test reports confirming earthing resistance and conductor continuity, and records of surge protection devices installed at incoming electrical and data lines.
Effect on coverage, premium and conditions
A correctly designed, regularly inspected lightning protection system, including surge protection for sensitive equipment, supports standard rating and is generally required by insurers to maintain full electronic equipment coverage without added deductibles. Missing or outdated systems, particularly the absence of internal surge protection, often lead to a condition requiring installation, higher deductibles for lightning and surge losses, or, for electronics-heavy risks, a specific exclusion until remediated.
Mitigation measures
Where lightning protection is absent, undersized or unmaintained, insurers and risk engineers typically recommend installing an external system designed to the appropriate protection level for the building’s risk class, fitting coordinated surge protection devices at all electrical and data entry points, and establishing a regular inspection and test programme covering earthing resistance and conductor continuity.