Railway Engineering Chapter 15: Cable Laying
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Questions and Answers

What is the recommended order for placing cables of different categories in the same trench?

  • Telecommunication cable, signalling cable, power cable (correct)
  • Power cable, telecommunication cable, signalling cable
  • Signalling cable, telecommunication cable, power cable
  • Signalling cable, power cable, telecommunication cable
  • Why should signalling cables for outdoor circuits not be laid above ground?

  • To avoid mechanical damage to the cable (correct)
  • To improve the aesthetics of the surroundings
  • To reduce the cost of installation
  • To avoid electrical interference
  • What is the minimum depth required for laying tail cables?

  • 0.30 meters
  • 0.50 meters (correct)
  • 1.0 meters
  • 0.75 meters
  • What is the purpose of spacing cable supports in outdoor circuits?

    <p>To avoid sagging of the cable</p> Signup and view all the answers

    How should indoor signalling cables be laid?

    <p>On ladders, channels or in any other approved manner</p> Signup and view all the answers

    In which type of area can cables be laid at a depth of 1.2 meters?

    <p>Theft prone areas</p> Signup and view all the answers

    What should be done when laying cables between the tracks?

    <p>Carry the cables in trunking/duct/pipe kept sufficiently below the ballast level</p> Signup and view all the answers

    What is the purpose of using ducts while laying cables?

    <p>To protect the cable from damage</p> Signup and view all the answers

    What is the minimum separation required between signalling cables and HT power cables?

    <p>3 meters</p> Signup and view all the answers

    What is the recommended minimum distance from the centre of the nearest track for laying cables outside the station section?

    <p>5.5 meters</p> Signup and view all the answers

    What is the purpose of using a row of bricks or other approved means to separate signalling cables from LT power cables?

    <p>To reduce the electromagnetic interference between cables</p> Signup and view all the answers

    What should be done at each end of the main cable?

    <p>Keep an extra loop length of 6 to 8 meters</p> Signup and view all the answers

    What should be done after laying the cables?

    <p>Back fill the trenches properly</p> Signup and view all the answers

    In which type of pipe can cables be laid?

    <p>Half Cut DWC-HDPE pipe/RCC</p> Signup and view all the answers

    What type of cable joints should be used?

    <p>Approved type</p> Signup and view all the answers

    Why is it necessary to maintain a distance of approximately 10 cm between cables of other departments and signalling cables?

    <p>To prevent damage to the cables</p> Signup and view all the answers

    What should be avoided when laying cables in a Cable room/Relay room?

    <p>Sharp cable bends</p> Signup and view all the answers

    What is the main purpose of laying cables in a trench?

    <p>To protect the cable from damage</p> Signup and view all the answers

    What is the recommended depth for laying the main cable parallel to the track?

    <p>1.0 meters</p> Signup and view all the answers

    What is the purpose of using a joint circular issued by the Civil Engineering, Signalling and Electrical Department?

    <p>To provide special precautions for laying cables in station yards</p> Signup and view all the answers

    Study Notes

    Cable Laying Instructions

    • Cables shall be laid generally as per instructions given in this chapter, with special precautions taken in station yards where multiple utilities may exist.
    • Cables may be laid underground, either in trenches, ducts, cement troughs, pipes, or any other approved manner.

    Cable Depth and Protection

    • Main cables laid parallel to the track shall normally be buried at a depth of 1.0 meters from top of cables to ground level, including those laid across the track.
    • The depth shall not be less than 0.50 meters for tail cables.
    • In theft prone areas, cables may be laid at a depth of 1.2 meters with anchoring at every 10 meters.
    • Half Cut DWC-HDPE pipe/RCC or any other approved type of ducts/pipes shall be used to protect the cables.
    • Ducts shall be designed and lengthened to prevent/minimize damages to cables by future digging activities in the vicinity.

    Cable Separation and Arrangement

    • Cables belonging to other departments must not be laid in the same trench along with Signal & Telecommunication cables.
    • A distance of approximately 10 cm must be maintained between cables of other departments and signalling cables.
    • Signalling cables must be separated from LT power cables by a row of bricks or any other approved means and from HT power cables by a minimum of 3 meters.

    Cable Laying Order and Precautions

    • Where several cables of different categories have to be laid in the same trench, they shall be placed in the following order, starting from the main track side:
      • Telecommunication cable
      • Signalling cable
      • Power cable
    • Signalling cables for outdoor circuits should not normally be laid above ground, but if necessary, precautions should be taken to avoid mechanical damage.

    Indoor and Outdoor Cable Laying

    • Indoor signalling cables should normally be laid on ladders, channels or in any other approved manner, neatly tied/laced.
    • Outdoor cables shall be laid in ducts suitably protected, and in station yards, cables shall be laid in ducts suitably protected.

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    Description

    This chapter discusses the guidelines and precautions for laying cables in railway stations, including underground cable laying methods. It also mentions the importance of joint circulars from relevant departments.

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