FIRE RESISTANT OPTICAL CABLE

摘要

A fire resistant optical cable (10) comprising: a plurality of optical fibers (11); at least one tubular layer of a ceramifiable material (13) surrounding the plurality of optical fibers; at least one flame shielding layer (16) surrounding the tubular layer. The tubular layer of the ceramifiable material (13) is able to mechanically protect the optical fibers not only during heating but also when the fire is extinguished, since it forms a sufficiently robust layer to withstand the mechanical stresses caused by the collapsing of the materials still surrounding the cable, especially in the transitions portions between hot and cold zones. The tubular layer of the ceramifiable material is protected by means of at least one flame shielding layer which prevents the flames to directly act onto the ceramifiable material.