A single lightning strike can inject millions of volts into a facility, causing structural fire, electrical surges, and catastrophic equipment failure. For manufacturers, investing in a robust Lightning Protection System (LPS) is non-negotiable.
Components of a Quality LPS
A complete LPS does more than just attract lightning; it safely dissipates the energy into the ground. A typical system involves:
- Air Terminals (Lightning Rods): Strategically placed at the highest points of a facility to intercept strikes.
- Down Conductors: Low-impedance paths that safely route the lightning current down the building's exterior.
- Earthing (Grounding) System: Deeply embedded ground rods/grids that safely disperse the energy into the earth.
- Surge Protection Devices (SPDs): Critical internal components that stop transient voltage spikes from reaching sensitive electronics and PLCs.
Regulatory Compliance
Under current electrical safety standards (such as IS/IEC 62305), a properly designed and maintained LPS is mandatory for industrial properties. Failure to comply can void property insurance and result in regulatory fines.
Don't wait for a storm to realize your protection is inadequate. Routine audits of your earthing pits and resistance values are essential to verify that your LPS is functional.
Installation is not the end of protection
Inspect the system after building alterations, rooftop equipment additions, excavation, visible strikes, and significant electrical work. Look for damaged conductors, loose or corroded joints, missing bonds, obstructed air terminals, changed separation distances, and test points that can no longer be accessed. Update drawings when the physical system changes so future testing reflects what is actually installed.
Coordinate the complete protection path
Air termination, down conductors, earthing, bonding, and surge protection work as one system. A low earth reading alone does not prove that sensitive controls are protected. Review incoming power, data and control lines, equipotential bonding, surge-device status, and the route a lightning current is intended to follow.
Technical Standards & Regulatory References
For lightning protection system (LPS) design, earthing, and surge protection, refer to:
- IS/IEC 62305 (Parts 1 to 4): Protection against lightning - Risk management, physical damage to structures, and life hazard.
- IS 3043:2018: Code of practice for earthing and equipotential bonding networks.
- NFPA 780: Standard for the Installation of Lightning Protection Systems.
- IEEE 142 (Green Book): Recommended Practice for Grounding of Industrial and Commercial Power Systems.
For details on how standards, evidence, and estimates are interpreted across our engineering services, see our Claims, Evidence & Attribution guidelines.
