Cage (Faraday) System Controls

Short answer: Faraday cage system checks verify the integrity of the lightning protection net created on the roof and facade. Net spacing, conductor cross-section, and connections are evaluated according to IEC 62305 protection level (LPL).

A Faraday cage captures lightning discharges in a controlled manner by surrounding the structure with a conductive mesh and safely directing them to the ground via step-down conductors. It is the most common lightning protection method for structures with large, flat roofs.

Maintaining network integrity is fundamental: a broken or corroded connection allows lightning current to find undesirable paths, damaging the structure and the systems within.

What is involved in cage system control?

• Suitability of capture net spacing to the protection level.
• Conductor cross-section, material, and corrosion status.
• Connection terminals and continuity
• Verification of connections with down conductors.
• Integration of rooftop equipment into the network.

Why is network range dependent on protection level?

IEC 62305 specifies different mesh spacing requirements according to the protection level (LPL I–IV) determined by the risk analysis of the structure: the highest level of protection requires the densest (narrowest) mesh spacing. The denser the mesh, the greater the probability of lightning strike and the safer distribution of current. Therefore, the adequacy of a mesh system is measured not only by its 'existence' but also by its installation with the correct spacing and cross-section. During periodic inspections, the mesh geometry, connection continuity, and corrosion are evaluated together.

Legal Basis and Accurate Assessment

Lightning protection systems undergo periodic inspections at least once a year and are documented with a TÜRKAK accredited report.

Frequently Asked Questions

In which structures are Faraday cages used?

It is commonly preferred in high-risk buildings with wide, flat roofs.

How is network spacing determined?

According to the building's protection level (LPL); higher protection requires more frequent networking.

How often should it be checked?

Generally recommended once a year; more frequently in high-risk environments.

Ensure your safety with accredited measurement.

For accredited measurement and control. Lightning Protection Please review our page for the legal framework. mandatory periodic inspection Check our guide.