The popular fire retardant composition includes a two part mixture having a liquid element and a strong component, although the composition will be ready as a single mixture. Other objects will partially be apparent and can partly appear hereinafter. Pat. No. 3,602,636 and won't be detailed here. Pat. No. 3,649,744 has a lot of the identical disadvantages. Pat. No. 3,602,636. Basically, it makes use of an open weave glass fiber tape wrapped around the clustered conductors. Briefly, the present cable tape has a backing composed of an open weave glass fiber scrim. The present cable has a number of distinct advantages over its typical counterparts as exemplified by the cables described within the aforesaid patents. In this method, the composition could also be made appropriate for software to cables and the like by brushing, rolling, spraying or trowelling. It relates extra significantly to fireplace-retardant insulation in sheet and tape kind for cables that are exposed to the weather and which must be capable to withstand tough usage, e.g. a service entrance cable.

This invention pertains to electrical cable. Still one other object of the invention is to supply a cable tape which has a relatively excessive tensile energy. Still additional, the tensile power of the prior cable tape just isn't as high because it may be, although it does pass the UL check for this characteristic. This check is described intimately in U.S. Exterior cable of this kind should satisfy the stringent test necessities of the Underwriters' Laboratories, Inc. For example, service entrance cable, which is the cable which conducts electricity from overhead energy traces into a user's house, should pass the UL 300 amp. Therefore, the thickness and, therefore, weight of the tape as an entire are less than those of conventional service entrance cable tape incorporating a pure or artificial rubber barrier layer which is calendered immediately onto the scrim. A skinny, steady polyester movie is bonded to the scrim using a fireplace-retardant artificial rubber laminate adhesive.

A barrier layer within the form of a skim coat of flame-retardant unvulcanized polychloroprene is calendered on the glass cloth and eventually an outer jacket of synthetic rubber is extruded in place onto the tapered conductors and fused to the underlying barrier layer. Finally, an outer resinous jacket is extruded in situ over the taped conductors, thereby forming a second continuous barrier or film across the conductors. An outer jacket 18 of a waterproof resinous materials akin to polyvinyl chloride, neoprene, or the like, is extruded in situ over the wrapped conductors, thus finishing the cable 10. As might be seen presently, the tape 14 and jacket 18 collectively kind a double continuous insulating barrier which is considerably impervious to moisture and the weather. Otherwise, the layer will not adhere properly. The invention accordingly contains the a number of steps and the relation of such steps with every of the others and the options of building, mixture of elements and arrangement of parts which will likely be exemplified in the development hereinafter set forth and the scope of the invention will probably be indicated in the claims.

FIG. 2 is a scrap view with elements broken away exhibiting the bedding and binding tape within the FIG. 1 cable in larger detail. Turning now to FIG. 2, tape 14 is comprised of a 20 × 10 open weave glass fiber cloth or scrim 22. A steady film 24 made of polyester, akin to that sold beneath the tradename "Mylar," is bonded to the scrim utilizing a relatively low viscosity fire-retardant plastic laminate adhesive 26. Suitable adhesive supplies embrace acrylic, acrylic-polyvinyl chloride copolymers and polyurethane. Turning now to the drawing FIG. 1, a section of service entrance cable is shown generally at 10. Cable 10 is comprised of a cluster, herein three, of insulated stranded conductors 12. Special cable insulation tape 14 to be described presently is helically wrapped about the clustered conductors 12 with the adjoining turns of the tape overlapping each other. Consequently, when the tape 14 is wrapped on the conductor as proven in FIG. 1, it constitutes a considerably steady membrane all across the tape from one finish of the tape to the other. Consequently, even after it has been in roll type for a relatively long time, the tape may be pulled from the roll with out "pickoff" of the film from the scrim.