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Questions and Answers
What is the recommended order for placing cables of different categories in the same trench?
What is the recommended order for placing cables of different categories in the same trench?
Why should signalling cables for outdoor circuits not be laid above ground?
Why should signalling cables for outdoor circuits not be laid above ground?
What is the minimum depth required for laying tail cables?
What is the minimum depth required for laying tail cables?
What is the purpose of spacing cable supports in outdoor circuits?
What is the purpose of spacing cable supports in outdoor circuits?
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How should indoor signalling cables be laid?
How should indoor signalling cables be laid?
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In which type of area can cables be laid at a depth of 1.2 meters?
In which type of area can cables be laid at a depth of 1.2 meters?
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What should be done when laying cables between the tracks?
What should be done when laying cables between the tracks?
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What is the purpose of using ducts while laying cables?
What is the purpose of using ducts while laying cables?
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What is the minimum separation required between signalling cables and HT power cables?
What is the minimum separation required between signalling cables and HT power cables?
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What is the recommended minimum distance from the centre of the nearest track for laying cables outside the station section?
What is the recommended minimum distance from the centre of the nearest track for laying cables outside the station section?
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What is the purpose of using a row of bricks or other approved means to separate signalling cables from LT power cables?
What is the purpose of using a row of bricks or other approved means to separate signalling cables from LT power cables?
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What should be done at each end of the main cable?
What should be done at each end of the main cable?
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What should be done after laying the cables?
What should be done after laying the cables?
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In which type of pipe can cables be laid?
In which type of pipe can cables be laid?
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What type of cable joints should be used?
What type of cable joints should be used?
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Why is it necessary to maintain a distance of approximately 10 cm between cables of other departments and signalling cables?
Why is it necessary to maintain a distance of approximately 10 cm between cables of other departments and signalling cables?
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What should be avoided when laying cables in a Cable room/Relay room?
What should be avoided when laying cables in a Cable room/Relay room?
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What is the main purpose of laying cables in a trench?
What is the main purpose of laying cables in a trench?
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What is the recommended depth for laying the main cable parallel to the track?
What is the recommended depth for laying the main cable parallel to the track?
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What is the purpose of using a joint circular issued by the Civil Engineering, Signalling and Electrical Department?
What is the purpose of using a joint circular issued by the Civil Engineering, Signalling and Electrical Department?
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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.
