Method of Installing Fire Resistant Corrugated Coaxial Cable
AssigneeAmerican Fire Wire, Inc.
InventorWilliam E. Rogers
Life of this patent
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Abstract
A method of installing a fire resistant corrugated coaxial cable that employs a high-temperature, insulating alkaline earth silicate (AES) wool dielectric is described. The AES wool dielectric is devoid of water as a constituent. The AES wool may be survivable under conditions of high heat, such as temperatures specified by common fire test standards (e.g., 1850° F./1010° C. for two hours). The cable is configured to maintain a relatively coaxial relation between a center conductor and an outer conductor even under aforementioned fire tests. A layer of ceramifiable silicone rubber or refractory fiber wrap can surround the outer conductor and continues to insulate it from the outside if a low-smoke zero-halogen (LSZH) jacket burns away.
Claims17
(canceled)
The method of claim 20 wherein the coaxial cable further comprises:
- a ceramifiable silicone rubber inner jacket or a ceramic fiber wrap inner jacket surrounding the outer conductor.
The method of claim 20 wherein the AES wool dielectric comprises fibers having a composition weight percentage of:
- wherein the total quantity of Al2O3, ZrO2, TiO2, B2O3 and iron oxides does not exceed 10 wt % based upon the total fiber composition.
The method of claim 20 wherein the AES wool dielectric comprises fibers having a composition weight percentage of:
The method of claim 20 wherein the AES wool dielectric comprises fibers having a composition weight percentage of:
- in which M is alkali metal and which at least 75 mol % of the alkali metal is potassium and soluble in physiological saline solution to give non-toxic dissolved components.
The method of claim 20 wherein the AES wool dielectric comprises fibers having a composition weight percentage of:
14-19. (canceled)
A method of installing a fire resistant coaxial cable, the method comprising:
- providing a coaxial cable having a center conductor surrounded by an alkaline earth silicate (AES) wool dielectric, which is surrounded by an outer conductor, the AES wool dielectric being substantially devoid of chemically bound or free water and being configured to maintain a predetermined dielectric spacing between the center conductor and the outer conductor when exposed to heat at or above 1010° C. in order to continue to propagate radio frequency (RF) signals;
- pulling or pushing the coaxial cable through a conduit;
- and
- connecting the coaxial cable to an antenna of a distributed antenna system.
21-24. (canceled)
Dependencies are inferred from the claim text.