that a current applied to any part of the conduit will be conducted to the
main earthing terminal for the installation.
Conduit is either made of heavy-gauge steel strip formed into a tube
with the seam welded, or solid drawn. The latter is very much more
expensive than welded to produce and its use is virtually restricted to gas-
or vapour-proof installations.
Oval conduit
Light-gauge conduit is also obtainable in oval form. This is particularly
suitable for use where the depth of plaster is insufficient to allow for the
standard round conduit without chasing the walls. Oval tubing is available in
close-jointed an
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