Single-mode cables containing 8 fiber optic cables, realized with LSZH sheath ( Low Smoke Zero Halogen). They assure a very low attenuation and a high transmission bandwidth. Thanks to their reduced thickness and the dielectric material of which they are composed, which makes them immune to electromagnetic interference, fibre optics can be inserted in electrical cables ducts. Also, in a distribution network, they don't require equipotential grounding.