Where should a lightning arrestor be installed?

A lightning arrestor should be installed at key points in an electrical or structural system where lightning is most likely to strike or where sensitive equipment needs protection. The goal is to intercept the lightning surge before it enters the system and safely direct it to ground.

Ideal Locations for Installing a Lightning Arrestor

1. At the Entry Point of Power Lines

- Install the arrestor where overhead power lines enter a building or substation.

- This prevents surges from entering the internal electrical system.

2. On Electrical Panels and Switchgear

- Install arrestors at the main distribution board or panel inside a building.

- This helps protect connected devices from voltage spikes.

3. Near Sensitive Equipment

- For highly sensitive systems like computers, telecommunications, or control panels, use point-of-use arrestors.

4. On Top of Tall Structures

- In buildings, towers, or industrial plants, install arrestors at the highest point (e.g., rooftops or antenna masts) to intercept lightning directly.

5. On Transformers and Substations

- Install arrestors at both high-voltage and low-voltage terminals of transformers to protect them from surges.

6. On Communication and Data Lines

- Place surge arrestors on coaxial or telephone lines to protect telecom and internet systems.

Installation Tips

- Always connect the lightning arrestor to a proper grounding system.

- Use short, straight, and low-resistance conductors from the arrestor to the ground.

- Avoid sharp bends in grounding wires, as they can cause flashovers.

Conclusion

A lightning arrestor should be installed where power or data lines enter, near vital equipment, and at the highest structural points. Proper placement ensures that surges are intercepted early and safely diverted, protecting the entire system from damage.