# US 5,705,774 A · Flame resistant electric cable

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- Number: US 5,705,774 A
- Document ID: US5705774A
- Status: Granted
- Kind: A
- Application number: 08/568,684
- Filed: 1995-12-07
- Granted: 1998-01-06
- Earliest claimed: 1995-12-07
- Assignees: Harbour Industries, (Canada) Ltd.
- Inventors: Mark Beauchamp
- Web page: https://patentgrep.com/patent/US5705774A

## CPC

- H01B 7/295: using material resistant to flame
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})

## Abstract

The disclosure herein describes a flame resistant electric cable which is capable of resisting flame temperatures in the neighborhood of 1000.degree. C. for at least two hours; the cable includes at least two electrical conductors each including an electrical wire, an extruded tubular member made of silicone surrounding the electrical wire, and an outer protective layer of braided inorganic material which surrounds the tubular member; the cable includes, underneath an overall outer braided jacket, an extruded elongate tubular member made of a silicone elastomer having a wall thickness of at least 0.030 of an inch.

## Claims

### Claim 1

A flame resistant electric cable capable of resisting flame temperatures in the neighborhood of 1000.degree. C. for at least two hours comprising: at least two electrical conductors, each consisting of an electrical wire, of an extruded tubular member made of a silicone elastomer surrounding said electrical wire, and of an outer protective layer of braided inorganic material surrounding said tubular member; an extruded elongate tubular member made of a silicone elastomer surrounding said electrical conductors, said extruded elongate tubular member having a wall thickness of at least 0.030 inch; and an overall outer braided jacket surrounding said elongate tubular member.

### Claim 2

A flame resistant electric cable capable of resisting flame temperatures in the neighborhood of 1000.degree. C. for at least two hours comprising: at least two electrical conductors, each conductor consisting of an electrical wire, of an extruded tubular member made of silicone elastomer surrounding said electrical wire and of an outer protective layer of braided inorganic material surrounding said tubular member; a ground wire; an aluminum/polyethylene teraphtalate shield enclosing said electrical conductors and said ground wire; an extruded elongate tubular member made of silicone elastomer surrounding said shield, said elongate tubular member having a thickness of at least 0.030 of an inch; and an overall outer braided jacket surrounding said elongate tubular member.

### Claim 3 (depends on 1)

A flame resistant electric cable as defined in claim 1, wherein said inorganic material is silica.

### Claim 4 (depends on 1)

A flame resistant electric cable as defined in claim 1, wherein said inorganic material is ceramic.

### Claim 5 (depends on 2)

A flame resistant electric cable as defined in claim 2, wherein said inorganic material is silica.

### Claim 6 (depends on 2)

A flame resistant electric cable as defined in claim 2, wherein said inorganic material is ceramic.