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The utilization of the laminate adhesive also improves the fire-resistance characteristics of the cable. The adhesive is coated onto the polyester film below relatively low application strain after which the movie and scrim are brought together while in a drying oven, the scrim being underneath comparatively high lengthwise tension and the coated movie being under a lesser tension, with the outcome that the scrim and film adhere tenaciously to each other. Turning now to FIG. 2, tape 14 is comprised of a 20 × 10 open weave glass fiber cloth or scrim 22. A steady movie 24 product of polyester, similar to that bought below the tradename "Mylar," is bonded to the scrim using a comparatively low viscosity hearth-retardant plastic laminate adhesive 26. Suitable adhesive materials embody acrylic, acrylic-polyvinyl chloride copolymers and polyurethane. Consequently, when the tape 14 is wrapped on the conductor as proven in FIG. 1, it constitutes a substantially continuous membrane all around the tape from one finish of the tape to the opposite.

Consequently, even after it has been in roll form for a comparatively long time, the tape could also be pulled from the roll without "pickoff" of the film from the scrim. Rather, the scrim 22 and coated film 24 are maintained under totally different lengthwise tensions which causes the two to be urged together in the drying oven with the consequence that they develop into firmly bonded to each other. Therefore, the 2 layers are urged together without the glass fibers within the scrim being cracked by extreme stress. In use, the tape is wound in regards to the clustered electrical conductors with conventional filler materials being offered if want be to fill the spaces between the conductors in order that the cable assures a usually round cross section. Finally, after the jacket 18 is applied, the conductors are shielded be double steady membranes. Finally, an outer resinous jacket is extruded in situ over the taped conductors, thereby forming a second steady barrier or film around the conductors. An outer jacket 18 of a waterproof resinous materials resembling polyvinyl chloride, neoprene, or the like, is extruded in situ over the wrapped conductors, thus finishing the cable 10. As can be seen presently, the tape 14 and jacket 18 collectively kind a double continuous insulating barrier which is considerably impervious to moisture and the elements.

Accordingly, this invention aims to offer a tape for insulating a cable comparable to a service entrance cable which is relatively simple to make in uniform high quality lots. These elements further adversely have an effect on the general insulating traits of the cable. That prior kind of cable is disadvantaged too because the unvulcanized barrier layer just isn't completely continuous; it accommodates pinholes which give passages for air or moisture which adversely affect the dielectric energy of the cable insulation. These cracks tend to lower the tensile strength of the fibers. Desirably, also, a filler sixteen composed of asbestos fibers or different such materials is wrapped along with conductors 12 so that it fills the spaces between the conductors, thereby giving the cable a cross section which is basically round. Also, by virtue of the low viscosity adhesive working up between the glass fibers 22a in the scrim, the tensile power of the tape is actually enhanced because the adhesive appears to kind a buffer between the person fibers 22a, lowering their tendency to abrade each other. Also, the unvulcanized rubber-coated glass cloth is applied to the conductors within the form of tape which is unwound from a roll.

In precise follow, the barrier layer tends to "choose off" from the cloth as the tape is unwound from the roll and it additionally undergoes a certain amount of cold circulate. During this bonding course of, the coated movie and scrim aren't pressed along with any nice amount of pressure. When the tape is constructed on this trend, the polyester film 24 therein is substantially steady and devoid of pinholes and presents a continuous, smooth surface so that the tape 14 can be served from a roll without the movie adhering to itself and choosing off from the scrim. Moreover, the tape floor is comparatively smooth. The online result is a superior insulating, bedding and binding tape which can be made at a lower cost than prior comparable merchandise and which, when integrated into an exterior cable system, enables the latter to easily pass the entire UL checks for such cables. Fire Sealing and Fire barrier for Electrical Cables and Cable Openings / Cut-Outs. The present cable has several distinct advantages over its typical counterparts as exemplified by the cables described in the aforesaid patents. All of those elements make the present tape a extremely successful commercial product whose attributes are additionally loved by the cable system into which the tape is incorporated.