Browse Prior Art Database

Rip Cord for Use With Plenum Cables

IP.com Disclosure Number: IPCOM000047906D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Abramson, P: AUTHOR [+3]

Abstract

An aramid fiber, such as KEVLAR*, is used as a rip cord to remove the protective jacket which surrounds current-carrying conductors or the like. Most data cables contain a braided metal shield surrounding the conductors. The metal shield prevents damage to the conductors when a knife or other instrument is used to strip the protective jacket from the cable. Some cables do not have the braided metal shield. If a knife is used to strip the protective jacket, the knife often damages the conductors. To prevent such damage, a rip cord is used to remove the protective jacket from the cable. A rip cord is a fibrous thread inserted beneath the jacket of the cable and rips through the jacket when it is pulled. To meet fire and smoke requirements for plenum use, cable jackets must be made of some fluoropolymer, such as TEFLON*.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Rip Cord for Use With Plenum Cables

An aramid fiber, such as KEVLAR*, is used as a rip cord to remove the protective jacket which surrounds current-carrying conductors or the like. Most data cables contain a braided metal shield surrounding the conductors. The metal shield prevents damage to the conductors when a knife or other instrument is used to strip the protective jacket from the cable. Some cables do not have the braided metal shield. If a knife is used to strip the protective jacket, the knife often damages the conductors. To prevent such damage, a rip cord is used to remove the protective jacket from the cable. A rip cord is a fibrous thread inserted beneath the jacket of the cable and rips through the jacket when it is pulled. To meet fire and smoke requirements for plenum use, cable jackets must be made of some fluoropolymer, such as TEFLON*. The fluoropolymers are very tough materials, and no rip cord has yet been developed capable of ripping through them. To remove such protective jackets from the conductors, it is suggested that the rip cord be made from an aramid fiber, such as KEVLAR. The KEVLAR strands are imbedded beneath the fluoropolymer jacket. When a force is applied to the KEVLAR strands, it rips through the fluoropolymer material and removes the jacket from the conductors. * Trademark of E. I. du Pont de Nemours & Co.

1