Industrie Pirelli S.p.a.

Societa Cavi Pirelli S.p.a.

Germano Beretta

Antonio Ferrentino

Giulio Tuci

Cesare Seveso

An electric cable which is combustion resistant and which prevents the spreading of fire, the cable having insulated conductors and a sheath, the materials of the conductor insulation and the sheath being materials which emit low amounts of toxic gases and smoke when burned. The spaces between the insulated conductors and between such conductors and the sheath are filled with a filler constituted by, the sheath is made from or the sheath is covered with a layer of hydrated aluminum sulfate and a binder of elastomeric or plastomeric material.

Electric cable with covering preventing fire spreading

An electric power cable having a Milliken-type conductor comprising at least four sectors, the conductor being paper-insulated and oil filled and each sector comprising metal wires stranded together. Each wire is covered with a layer of a cross-linked synthetic resin having a thermal classification of 120.degree. C., a CEI resistance to abrasion of at least 50 cycles, a CEI thermal pressure value higher than 170.degree. C. and an insulating oil contaminating effect of substantially zero, such resin also being substantially completely volatizable by the heat used for joining cables by welding. Preferred resins are a polyvinyl-acetal resin, such as a polyvinyl-formal resin, cross-linked with a phenol resin and, optionally, a melamine resin and such with the addition of a blocked isocyanate.

Electrical power cable with stranded insulated wires

An optical fiber band comprising a pair of thermally sealed thermoplastic films with a plurality of optical fibers in side-by-side relation and following undulate paths embedded therebetween, and a telecommunication signal cable formed by winding a plurality of such bands around an insulated metal rope. The thermoplastic films and the fibers are fed between rollers or cylinders while the fibers are undulated. The films are heated to their softening temperature on at least parts of their facing surfaces prior to reaching the cylinders. The films may each be composite films of different temperature characteristics or may be wider than the final band, heated only at their central portions and then trimmed to the final band size.

Growing community of inventors

Monza, Italy

Germano Beretta