01/04/2026
✔️ Protection Against Lightning Begins With Risk Assessment, Not Equipment
Lightning protection is one of the most neglected truths in industrial projects.
Many plant owners live under a dangerous impression: “We already have a lightning arrester, so we are protected.”
In reality, what often exists is only a device installed years ago by routine practice, without any formal lightning risk assessment, without a coordinated protection design, and without checking whether the system actually suits the structure, process criticality, occupancy, or sensitive electronics inside the plant.
When a lightning-related failure, fire, equipment burnout, or shutdown occurs, the blame game begins between owner, contractor, consultant, and vendor.
This apathy is costly.
Lightning protection is not just about fixing one ESE terminal or a horn-gap type arrester on the terrace and assuming the job is done.
The current IEC framework treats lightning protection as a complete system: risk assessment first, then selection of protection measures, then design, installation, inspection, maintenance, and protection of internal electrical/electronic systems through surge protection and bonding.
That is the real message of the IEC 62305 series.
💡 What do the relevant standards say?
IEC 62305-1:2024 lays down the general principles for protection of structures, installations, contents, and persons. IEC 62305-2:2024 specifically provides the procedure for evaluating lightning risk and selecting protection measures to bring the risk down to a tolerable level. IEC 62305-3:2024 covers protection against physical damage to structures and life hazard, including design, installation, inspection, and maintenance of the lightning protection system, as well as protection against touch and step voltages. IEC 62305-4:2024 addresses electrical and electronic systems within structures and requires surge protection measures to reduce failure due to lightning electromagnetic impulse.
In India, the older IS 2309:1989 is shown in the public BIS archive record as withdrawn and superseded by IS/IEC 62305 parts, which is why owners should stop relying on outdated rule-of-thumb installations and start demanding standards-based assessment and design.
✴️ Project owners must ask uncomfortable questions:
👉 Was a lightning risk assessment ever carried out?
👉Is the protection level justified by calculations?
👉Are the down conductors, bonding, earthing, and separation distances adequate?
👉Are SPDs installed and coordinated for incoming power and sensitive systems?
👉Has the system been inspected and maintained over time?
Because lightning does not care about assumptions.
And nature does not forgive negligence.