steel earth and concrete.5 mm
Round, solid mm
Cable (b) mm²
Round, solid mm
Copper-coated steel (c)
Round, solid mm
Strip solid 2. All metals in
direct contact with the ground water can corrode
due stray current aggressive soils.27: Material, form and minimum dimensions air-termination cables, air-termination rods, earth entry rods
and conductors
TBS
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Chapter The external lightning protection system
.7 Materials and corrosion protec-
tion
The following materials are preferred for use extern-
al lightning protection systems: Hot galvanised steel,
rustproof steel, copper and aluminium. can also occur when a
single type metal embedded two distinct envir-
onments, e.
Causes corrosion
Corrosion occurs when different metals are connected
with one another soil, water molten salt, e.
The minimum cross-sections,
shape and material depend the
appropriate application.5 mm
Rustproof steel (a)
Strip solid 2.
(c) least copper plating with 99.TBS
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2. Corrosion is
when metal material reacts with its surroundings to
the detriment the material’s properties.5 mm
Round, solid (b) mm
Cable (b) mm²
Round, solid mm
Aluminium
Round, solid mm
Cable mm²
Copper-coated aluminium alloy Round, solid (c) mm
Aluminium alloy
Strip solid 2.g.5 mm
Round, solid mm
Cable (b) mm²
Round, solid (d) mm
(a) Chromium 16%; Nickel 8%; Carbon 0.g.
Material Form Minimum dimensions
Copper, tin-plated copper
Strip solid 2.9% copper content
(d) Can used for air-termination rods and base
Table 2.5 mm
Round, solid mm
Cable (b) mm²
Round, solid mm
Hot galvanised steel
Strip solid 2.08%
(b) Diameter can certain applications reduced mm2
(diameter mm) mechanical resistance not primary criterion. alu-
minium round conductors arrestors and copper-
/steel earthing material
