A lightning protection system doesn’t last forever. As it ages, its ability to safely carry a strike to earth degrades — often invisibly — until a storm exposes the weakness. This guide explains lightning protection levels and the five warning signs that your system needs upgrading.
Lightning Protection Levels (LPL)
The IEC 62305 standard classifies lightning protection into four levels (I–IV), based on current capacity and reliability. LPL I is the highest — around 200 kA with 99% reliability — down to LPL IV at lower specifications. Knowing your building’s required level is the starting point for judging whether the existing system is still adequate.
5 Warning Signs Your System Needs Upgrading
- Frequent equipment malfunctions during storms: a sign the surge-protection devices can no longer handle transient voltages properly.
- Visible oxidation or burn marks on the lightning-rod head: indicating material degradation and poor current conduction.
- High ground resistance (above 5 ohms): which prevents a strike from discharging properly to earth.
- Inadequate coverage after building modifications or added equipment: creating protection “blind spots.”
- Age beyond 5–10 years without maintenance: leading to conductor corrosion and connection failures.
The Upgrade Solution
Where an old system shows these signs, upgrading to modern high-voltage lightning arresters better manages dangerous voltage surges and delivers long-term safety improvements. A proper upgrade also restores full coverage and brings ground resistance back within specification.
Upgrade Your Protection with TETA Intertrade
TETA Intertrade supplies high-voltage lightning arresters, lightning rods, grounding equipment, and surge-protection devices, with technical guidance to match the right protection level to your building. If your system shows any of the warning signs above, talk to us about an upgrade before the next storm.
Frequently Asked Questions (FAQs)
How often should a lightning protection system be inspected?
Systems older than 5–10 years, or any showing warning signs, should be inspected promptly — and ideally checked periodically — because corrosion and loose connections develop invisibly over time.
What ground resistance is acceptable?
Ground resistance above 5 ohms is a warning sign that a strike can’t discharge properly to earth. A proper system keeps resistance low so current flows safely to ground.
What are Lightning Protection Levels (LPL)?
Under IEC 62305, LPL I–IV classify protection by current capacity and reliability, from LPL I (about 200 kA, 99% reliability) down to LPL IV. Your building’s required level determines whether the existing system is adequate.
Does adding equipment or extending a building affect protection?
Yes. Modifications and new equipment can create coverage gaps (“blind spots”) that the original system wasn’t designed for, which is one of the key signs an upgrade is needed.
