Flame-retardant cable tubing bundle

Details Flame-retardant cable tubing bundle Flame-retardant cable tubing bundle

1994-12-21

1996-10-08

Ullah, Akm E.

Optical waveguides

Optical transmission cable

174 681, 385147, G02B 644

Patent

active

055639755

ABSTRACT:
A flame-retardant optical fiber cable tubing bundle which can be vertically mounted in the shaft of a building comprised of a plurality of tubes; a first thermoplastic layer surrounding the tubes; and, a tape wrapped spirally along the longitudinal axis of the first thermoplastic layer. A second thermoplastic layer surrounds the tape. A method for complying with the UL 1666 fire test procedure for a cable tubing bundle intended for vertical installation includes the steps of liquefying a cross-sectional area of a thermoplastic layer of the cable tubing bundle; forcing the flow of the liquified thermoplastic inwardly to the center of the cable tubing bundle; and, charring the liquified thermoplastic to form a cross-sectional area of solid material in the interior of the cable tubing bundle.

REFERENCES:
patent: 4723831 (1988-02-01), Johnson et al.
patent: 5062685 (1991-11-01), Cain et al.
patent: 5136683 (1992-08-01), Aoki et al.
patent: 5173960 (1992-12-01), Dickinson
patent: 5189721 (1993-02-01), Sayegh et al.
patent: 5204928 (1993-04-01), Konda et al.

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