FIRE-RESISTANT ELECTRICAL CABLE, MAINLY FIRE-AND-EXPLOSION-PROOF, WHICH PROPAGATES NO FIRE, FOR SPARK-PROOF CIRCUITS Russian patent published in 2015 - IPC H01B7/295 

FIELD: electricity.

SUBSTANCE: cable includes a core consisting of at least one insulated single-wire or multi-wire current-conducting copper or tin-plated copper strand or at least one group of the above said strands twisted into a pair, or a triple, or a quadruple. Fire-resistant strands have two-layered combination insulation, the first layer adjacent to the current-conducting strand is extruded from silicon rubber ceramised under conditions of flame action, the second layer is made at least by one mica band by applied winding along a spiral with overlapping with a mica coating to the inner side, with tension of the band at winding of at least 7 H. For the purpose of identification, above the winding of the mica band there applied on each insulated strand with contrast inks or paint is an individual number. Above the core there laid is a bandage with at least one mica band by winding along the spiral with overlapping of the mica coating to the inner side.

EFFECT: providing operability of the proposed cable during fire with mechanical impacts on the cable attachment base.

22 cl, 1 dwg