Lightning Protection Systems

Air terminals, down conductors, clamps and fixings, and CASKWeld exothermic welding: a complete lightning protection system from CASK STEEL, designed to work together with our earthing systems.

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How a lightning protection system works

  • Air terminals (lightning rods) on the highest points of the structure capture the strike.
  • Down conductors of copper or aluminium carry the lightning current quickly to the ground.
  • The earthing system dissipates the energy safely into the ground.

Together they protect people, buildings and sensitive equipment, reduce downtime from strikes and help meet building codes in thunderstorm-prone regions.

Lightning air terminal installed on a building roof

Conductors

ConductorSizes
Copper tape, bare or PVC covered12.5 × 1.5 mm to 50 × 6 mm
Tinned copper tape, bare or PVC covered12.5 × 1.5 mm to 50 × 6 mm
Aluminium tape, bare or PVC covered12.5 × 1.5 mm to 50 × 6 mm
Flexible copper and tinned copper braid12 × 1.5 mm to 75 × 6 mm, current ratings 40 to 1,500 A
Bare stranded copper conductor6 to 300 mm², also tinned
Solid circular conductor8 mm copper or aluminium (50.27 mm²), 50 m coils; PVC covered and tinned versions
Hard drawn copper, tinned copper and aluminium bar25 × 3 mm to 75 × 6 mm; other sizes on request

Air rods and accessories

Taper pointed lightning air rod

Air rods

Taper pointed copper or aluminium air rods, Ø15 mm (M16) from 500 to 3,000 mm and Ø10 mm (M10) from 500 to 1,000 mm, with or without multiple points, air rod bases and brackets. Free-standing interception masts from 0.5 to 10 m high on concrete bases, with square, tripod or H-shaped frames.

Range of copper earth and lightning conductors

Down conductors

Copper, tinned copper and aluminium tapes, stranded and solid circular conductors, flexible braids and hard drawn bars, bare or PVC covered, in the sizes listed above.

Lightning protection clamps, saddles and fixings

Fixings and clamps

Flat conductor and ridge saddles, strike pads, DC tape clips, one-hole clips, cable saddles, square tape clamps, bi-metallic connectors, test clamps and cable T clamps.

CASKWeld exothermic welding

CASKWeld is an exothermic welding system that needs no external heat source. It makes strong, highly conductive connections that are permanent and do not loosen over time, even under repeated fault currents.

  • Moulds of high-density graphite, each good for 50 to 80 welds; custom moulds for power stations, railways and other special applications
  • Weld metal in powder and tablet form, in packs from 15 to 250 g
  • Connections: bar to bar, bar to earth rod, cable to bar, cable to cable and cable to earth rod
  • Tools: handle clamps, retaining discs, cleaning brushes, mould scrapers, sealing compound and flint guns

Frequently asked questions

Copper or aluminium conductors?

Copper has the higher conductivity and suits most installations, including below-ground connections. Aluminium is lighter and lower in cost and is often used for above-ground air terminations and down conductors. Bi-metallic connectors join the two safely.

Why use exothermic welding instead of mechanical clamps?

An exothermic weld is a molecular bond with conductivity at least equal to the conductor. It cannot loosen or corrode at the joint, so it is preferred for buried and inaccessible connections.

Can you supply a complete system for a project?

Yes. Air terminals, conductors, fixings, earthing materials and CASKWeld can be supplied together. Send us your roof plan or bill of quantities.

Related products

Earthing systems Cable trays and cable ladders All CASK Steel products

Protecting a building or plant from lightning?

Send us the roof plan, structure height and site location, and we will quote the complete system.

Request a quotation+90 552 520 40 10