What it is
A lightning protection system protects a building, its occupants, and its electrical systems from the direct and indirect effects of a lightning strike. Installation is governed by BS EN 62305, which sets out the four parts of a compliant system: risk management (Part 2), physical protection of structures (Part 3), and protection of electrical and electronic systems within structures (Part 4).
A physical protection installation typically includes an air termination network on the roof, a down conductor network on the facade or within the structure, an earth termination network at the base, and the bonding required to bring extraneous metalwork into the equipotential zone. Where electronic systems require protection, surge protection devices are installed at the relevant boundaries.
Every installation starts with a risk assessment to BS EN 62305-2 to determine the required class of protection. The design is then drawn against the building geometry, and the installation is delivered, tested, and certified by competent engineers.
When it applies
- New build where BS EN 62305 risk assessment identifies a required protection class
- Refurbishment or extension where the existing system no longer covers the structure
- Following an inspection where the existing system has been condemned
- After significant changes to the building envelope, plant, or electronic systems
- Where insurance or planning conditions require a compliant system
The process
- Risk assessment. BS EN 62305-2 risk assessment to determine the required protection level.
- System design. Air termination, down conductor, and earth termination networks drawn against the building geometry.
- Quotation. Fixed-price covering risk assessment, design, supply, installation, and commissioning testing.
- Installation. Carried out by our own engineers. Air rods, tape, fixings, down conductors, earth electrodes, and surge protection installed.
- Commissioning. Continuity, earth resistance, and bonding all tested. Test certificates issued.
What you receive
- Installation certificate to BS EN 62305
- Risk assessment document to BS EN 62305-2
- As-built drawing of the full system
- Earth resistance and continuity test results
- Photographic record of installation
- 12-month recertification reminder