Metallic Plain Ended Rigid Conduit
Introduction
Galvanised rigid steel conduit installed in concrete does not require supplementary corrosion protection.
Galvanised rigid steel conduit, installed in contact with soil, does not generally require supplementary corrosion protection.
However, when buried in corrosive soil (corrosive soil is characterized by low resistivity of less than 2,000 ohm-centimeter) or cinders, a protective coating of bitumastic, asphalt-based paint or a PVC coating is applied to the conduit.
Steel conduit protected from corrosion solely by enamel can only be used indoors and in occupancies not subjected to severe corrosive influences.