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How to protect industrial switches from lightning strikes

Fiber and communications infrastructure knowledge brief Published 04 May 2023

Use this reference to prepare product questions for BAGYOU FIBRE. Check interfaces, capacity, protection and installation requirements against the current product documentation.

Industrial switches can be protected from lightning strikes using a combination of surge protection devices, proper grounding, lightning rods, and careful wiring practices. Key Protection Strategies1. Surge Protection Devices (SPDs) Install SPDs near industrial switches to absorb and divert high-voltage transients caused by lightning.

These devices, also called surge arrestors or lightning barriers, operate almost instantaneously to provide a low-impedance path to ground, preventing voltage spikes from reaching sensitive switch components. Metal oxide varistor (MOV) types are commonly used for industrial applications and can handle large transient currents while restoring normal operation after the surge subsides. 2.

Grounding and Earthing Systems Proper grounding is essential. All metal structures, switch enclosures, and electrical panels should be connected to a low-resistance earth electrode. This ensures that lightning currents are safely diverted into the ground rather than through the equipment.

Grounding systems should be regularly inspected for corrosion or loose connections to maintain effectiveness. 3. Lightning Rods and Air Terminals For direct strikes, air terminals (lightning rods) intercept the lightning and channel it through down conductors to the grounding system.

This prevents the strike from passing through the building or switchgear. Down conductors should be designed to minimize inductance and provide a direct path to the earth electrode. 4.

Wiring and Shielding Practices Use metallic raceways, cable shields, and twisted pairs to reduce the impact of induced surges from nearby strikes. Proper routing and separation of power and signal lines help minimize electromagnetic interference. Filtering components can also be added to block high-frequency transients while allowing normal operation.

5. Maintenance and Monitoring Regularly inspect surge protection devices, grounding connections, and lightning protection systems. Implement weather monitoring systems to provide early warnings of storms, allowing sensitive equipment to be unplugged or powered down if necessary.

Training personnel on lightning safety procedures ensures quick and effective response during storms. 6.

Multi-

Layered Protection Approach A robust lightning protection plan combines diversion (grounding), attenuation (shielded wiring), and suppression (SPDs) to provide comprehensive protection. This layered approach ensures that both direct and indirect lightning effects are mitigated, keeping industrial switches operational and safe. By integrating these strategies, industrial switches can be effectively safeguarded against lightning-induced surges, minimizing downtime and equipment damage.

How to protect industrial switches from lightning strikes - BAGYOU FIBRE NETWORKS [PDF]

How to protect industrial switches from lightning strikes

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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