6.5.4.4 Additional corrosion protection measures

Connecting cables / terminal lugs between foundation earth electrodes and down conductors
Galvanised steel connecting cables between foundation earth electrodes and down conductors should be laid in concrete or masonry until they are above the surface of the earth. If the connecting cables are led through the ground, terminal lugs with e.g. NYY cable, 1 x 16 mm² Cu, stainless steel in the composition as for earth electrode materials, or fixed earthing terminals must be used.
Earthing conductors installed in the masonry can also be led upwards without corrosion protection.

Earth entries made of galvanised steel
Earth entries made of galvanised steel must be protected against corrosion over a distance of at least 0.3 m above and below the surface of the earth.
Generally, bituminous coatings are not sufficient. A moisture-proof sheath, e.g. butyl rubber strips, heat-shrinkable sleeves or stainless steel, provides protection.

Underground connections
Cut surfaces and connection points in the ground must be designed so as to ensure that they have an equivalent corrosion resistance as the corrosion protection layer of the earth electrode material. Connection points in the ground must therefore be equipped with a suitable coating, e.g. wrapped with an anti-corrosion tape.