Underground light current cables protective enclosure - consists of wire mesh duct coated with rust inhibiting layer and forming continuous conducting pathway

The object of the enclosure (1) is to provide electromagnetic screening for light current cables laid underground, and incidentally also to give mechanical protection. The enclosure is made of a ferrous metal mesh, e.g. woven steel wires, with contact at each mesh intersection. Each mesh wire is coated with a rust inhibiting layer which also covers the contact points. Typically the mesh is formed into a rectangular duct with a lid, (4) and adjoining sections are electrically connected together. The rust resistant covering may be a plastics coating, red lead paint, bitumen or similar substance. A double concentric duct can be constructed if necessary.