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Earthing
Earth electrodes
Three types Furse earth rod are available, but the copperbonded
steel cored rod far the most popular, due its combination strength,
corrosion resistance and comparatively low cost. The counter-bored
couplings are made from high copper content
alloy, commercial brass not used.
The thread rolling process, used quality rod
manufacturers, raises the surface the rod so
that thread diameter (B) greater than shank
diameter (A) (see drawing). They are made molecularly
bonding 99.Quality earth rods are commonly made from
either copperbonded steel, solid copper or
stainless steel.
Stainless steel rod
Stainless steel rods are used overcome many
of the problems caused galvanic corrosion
which can take place between dissimilar metals
buried close proximity.
A
B
72 FURSE® EARTHING LIGHTNING PROTECTION
QUALIT SOLUTIONS FOR SAFEGUARDING PEOPLE, STRUCTURES AND SERVICES
. They are ideally used in
applications where soil conditions are very
aggressive, such soils with high salt content.
Copperbond rod
Furse copperbond earth rods probably offer to
the installer the best and most economical earth
rods available. Furse rods are not the
sheathed type. All threads are
Unified National Coarse (UNC-2A).9% pure electrolytic copper a
low carbon steel core. Furse stainless steel
earth rods are highly resistant corrosion.
Solid copper rod
Furse solid copper earth rods offer greater
resistance corrosion. They are highly resistant to
corrosion, and because the steel used has very
high tensile strength, they can driven power
hammers great depths. Solid copper and stainless steel
rods offer very high level corrosion resistance
at the expense lower strength and higher cost.
Thread and shank diameters
Confusion often arises between thread and
shank diameters for threaded rods
