Fire resistant coaxial cable
AssigneeAmerican Fire Wire, Inc.
InventorWilliam E. Rogers
Life of this patent
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Abstract
A fire-resistant coaxial cable is described in which the dielectric between the central conductor and outer coaxial conductor can ceramify under high heat. The dielectric is composed of a ceramifiable silicone rubber, such as that having a polysiloxane matrix with inorganic flux and refractory particles. An outer wrap of ceramic fiber yarn surrounds the outer conductor and continues to insulate it from the outside if a low smoke zero halogen jacket burns away. Embodiments include those with durable corrugated outer conductors or flexible braided outer conductors. Methods of testing and installation are described.
Claims20
A fire resistant coaxial cable apparatus comprising:
- a center conductor;
- a tubular ceramifiable silicone rubber dielectric surrounding the center conductor and having a radial thickness greater than 4.2 millimeters, the ceramifiable silicone rubber dielectric comprising inorganic flux particles and refractory particles in a poly siloxane matrix, the ceramifiable silicone rubber dielectric configured to convert from a resilient elastomer to a porous ceramic when heated above 425° C.;
- an outer conductor surrounding the dielectric;
- and
- a ceramifiable silicone rubber inner jacket surrounding the outer conductor.
A fire resistant coaxial cable apparatus comprising:
- a center conductor;
- a tubular ceramifiable silicone rubber dielectric surrounding the center conductor and having a radial thickness greater than 4.2 millimeters, the ceramifiable silicone rubber dielectric comprising inorganic flux particles and refractory particles in a poly siloxane matrix, the ceramifiable silicone rubber dielectric configured to convert from a resilient elastomer to a porous ceramic when heated above 425° C.;
- an outer conductor surrounding the dielectric;
- and
- a ceramic fiber wrap inner jacket surrounding the outer conductor.
A fire resistant coaxial cable apparatus comprising:
- a center conductor;
- a ceramic fiber wrap dielectric surrounding the center conductor;
- an outer conductor surrounding the dielectric, the ceramic fiber wrap dielectric configured to maintain a predetermined spacing between the center conductor and the outer conductor, the predetermined spacing fixed at a constant between 3.4 millimeters and 7.6 millimeters;
- and
- a ceramifiable silicone rubber inner jacket or a ceramic fiber wrap inner jacket surrounding the outer conductor.
Dependencies are inferred from the claim text.