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Fire resistant signaling cable for railway applications

A cable and signaling technology, used in communication cables, insulated cables, cables with double-stranded/quad-stranded, etc., can solve the problem of not ensuring the normal operation of the line, not protecting the conductor from flame damage, etc. question

Pending Publication Date: 2020-05-15
PRYSMIAN SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no protection of the conductors from flames, so proper operation of the line cannot be ensured

Method used

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  • Fire resistant signaling cable for railway applications
  • Fire resistant signaling cable for railway applications
  • Fire resistant signaling cable for railway applications

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Embodiment Construction

[0020] For the purposes of this specification and the appended claims, all figures expressing amounts, amounts, percentages etc. are to be understood in all instances as being modified by the term "about" unless otherwise indicated. Also, all ranges include any combination of the maximum and minimum points disclosed, and include any intermediate ranges therein, which may or may not be specifically recited herein.

[0021] In at least one of the above-mentioned aspects, the present disclosure can be implemented according to one or more of the following embodiments, optionally combined together.

[0022] For the purposes of this specification and the appended claims, the words "a" or "an" shall be read to include one or at least one and the singular also includes the plural unless it is obvious that it is meant to the contrary. This is done merely for convenience and to give a general sense of the disclosure.

[0023] figure 1 An embodiment of a signaling cable 1 according to ...

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Abstract

The present invention relates to a signaling cable (1) comprising: a cable core (2) comprising: a plurality of electric conductors (3) each insulated by a fire barrier (3a) and a flame retardant low smoke zero halogen polymeric insulating layer (3b); a core wrap (5); a metallic screen (7) surrounding and in direct contact with the cable core (2); at least one flame retardant low smoke zero halogenpolymeric sheath (8, 9) in radially outer position with respect to the metallic screen (7).

Description

technical field [0001] This invention relates to signaling cables, and in particular to fire resistant signaling cables for railway systems. Background technique [0002] Signaling cables are used in railway networks for various applications including, for example, optical switching, track changes and communications in signaling equipment. Signaling cables are designed so that each conductor carries typically less than one ampere of current to operate signaling circuit equipment. [0003] In the railway system, the electromagnetic field generated by the power supply voltage of the catenary (usually 25KV AC) induces a current in the signaling cable laid in parallel, which will damage the equipment connected to it and pose a safety hazard. In order to reduce this effect to a non-hazardous level, the cable has a metallic screen. The protective effect of this shielding is rated as a "reduction factor" (rf). The reduction factor is the ratio of the induced tension with shieldi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B7/29H01B7/295H01B7/02H01B11/06
CPCH01B7/295H01B7/29H01B7/0275H01B11/06H01B7/0283H01B11/1016H01B7/183H01B7/1875
Inventor C·阿尔藤格兹B·索恩姆兹N·耶尔德兹Z·西林
Owner PRYSMIAN SPA