1) What does a complete lightning protection system include?
A complete system includes external interception (air terminals), down conductors, earthing/grounding, and internal surge protection (SPDs). You need all layers to protect structure and equipment together.
2) Do lightning rods attract lightning?
No. They do not "pull" lightning from far away. They provide a controlled low-impedance path when a strike occurs nearby, reducing structural damage risk.
3) Is one ESE lightning rod enough for any building?
Not always. Coverage depends on lightning rod model (Delta-T), roof geometry, building height, and required protection level. Use project-specific calculation per applicable standard.
4) What is the difference between ESE and a conventional rod?
A conventional rod is passive. An ESE lightning rod is designed to initiate upward streamer earlier under storm conditions, which can increase practical coverage when designed correctly under NFC 17-102 and coordinated with IEC-based design logic.
5) Why are SPDs needed if we already have air terminals?
Air terminals handle direct strike current path. SPDs handle transient overvoltages entering power/data lines. Without SPDs, sensitive electronics can still fail even if the structure is externally protected.
6) Which SPD type should be installed (Type 1, 2, 3)?
Typical coordination: Type 1 at main incoming board (especially with LPS), Type 2 at distribution level, and Type 3 near critical terminals. Selection depends on network topology and exposure.
7) What earthing resistance value should we target?
There is no single universal number for every site, but in many industrial applications designers target low resistance values (often around or below 10 ohms) plus equipotential bonding. Soil resistivity and design method are decisive.
8) How often should lightning protection be inspected?
At least periodically (commonly annual visual/continuity checks) and additionally after major strikes, renovations, or system alterations. Inspection intervals should follow local regulation and risk class.
9) Can surge protection be installed without external lightning protection?
Yes, and it is often beneficial for electronic reliability. But for direct strike risk on structures, SPDs alone are not a substitute for a full external lightning protection system.
10) Are data/telecom lines included in surge protection design?
They should be. Ethernet, RS485, CCTV, fire alarm, and PV monitoring lines can carry surges. Proper design includes coordinated protection for both power and signal interfaces.
11) How is protection level selected?
Protection level is selected using risk assessment inputs: lightning density, building function, occupancy, downtime cost, fire/explosion consequence, and line exposure. Critical facilities usually require stricter protection classes.
12) Is lightning protection only for very tall buildings?
No. Medium-height factories, warehouses, solar farms, and isolated structures can have high exposure too. Strike probability and consequence matter more than height alone.
Need project-specific guidance? Use our Risk Calculator or contact ORBITAL engineering for a site-based recommendation.