Fire resistive cable system

Patent metadata

Field	Value
Publication number	US-11276511-B2
Application number	US-201616072649-A
Country	US
Kind code	B2
Filing date	Jan 26, 2016
Priority date	Jan 26, 2016
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

Abstract

A fire-resistive cable system comprises an electrical cable housed in a fiberglass-reinforced thermosetting resin conduit. The electrical cable comprises a conductor and has only one couple of mica tapes surrounding the conductor. The couple of mica tapes are formed of a first mica tape and a second mica tape wound around the first mica tape. The mica layer of the first mica tape faces and contacts the mica layer of the second mica tape. The fiberglass-reinforced thermosetting resin conduit is made of a material comprising fibers of a glass selected from E-glass and E-CR-glass, and a resin.

First claim

What is claimed is:

1. A fire-resistive cable system comprising an electrical cable housed in a fiberglass-reinforced thermosetting resin conduit, wherein the electrical cable comprises a conductor and has one couple of mica tapes surrounding the conductor, the couple of mica tapes being formed of a first mica tape and a second mica tape wound around the first mica tape, each of the first and the second mica tape including a mica layer attached to a backing layer, and the mica layer of the first mica tape faces and contacts the mica layer of the second mica tape; and wherein the first fiberglass-reinforced thermosetting resin conduit is made of a material comprising fibers of a glass selected from E-glass and E-CR-glass, and a resin; and wherein the first mica tape is wound in a winding direction that is opposite to a winding direction of the second mica tape.

2. Fire-resistive system of claim 1 , wherein the electrical cable further comprises at least one insulation layer surrounding the couple of mica tapes.

3. Fire-resistive system of claim 2 , wherein the electrical cable further comprises a first insulation layer and a second insulation layer.

4. Fire-resistive system of claim 3 , wherein the first insulation layer is formed of a silicone-based compound.

5. Fire-resistive system of claim 4 , wherein the silicone-based compound includes a silicone-based rubber forming a matrix with a flame-retardant mineral filler incorporated into the matrix.

6. Fire-resistive system of claim 4 , wherein the second insulation layer is made of a flame-retardant polymer.

7. Fire-resistive system of claim 1 , wherein the resin of the conduit is a phenolic resin.

8. Fire-resistive cable system of claim 2 , wherein the at least one insulation layer contacts and is applied directly onto the second mica tape.

Assignees

• Prysmian Spa

Inventors

• Blair Ronald
• Constantine Walter
• Waterman Kendall

Classifications

• H01B3/36

  condensation products of phenols with aldehydes or ketones · CPC title

• H01B7/0283

  comprising in addition one or more other layers of non-extruded insulation · CPC title

• H01B3/04

  mica · CPC title

• H01B7/295 Primary

  using material resistant to flame · CPC title

• H01B7/29

  Protection against damage caused by extremes of temperature or by flame {(heat dissipation or conduction H01B7/42)} · CPC title