Railway Cable Laying Chapter 15

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Questions and Answers

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

1.2 meters from top of cables to ground level

1.5 meters from top of cables to ground level

1.0 meters from top of cables to ground level (correct)

0.5 meters from top of cables to ground level

What is the purpose of using ducts or pipes while laying cables?

To reduce the depth of cable laying

To protect the cables from damage (correct)

To facilitate future digging activities

To increase the distance between cables

Why is it desirable to protect cables in rocky areas?

To facilitate future digging activities

To prevent water collection in the duct

Because a depth of 1.0 meter is not feasible (correct)

To increase the distance between cables

What is the minimum distance that should be maintained between cables of other departments and signalling cables?

10 cm Signup and view all the answers

How should signalling cables be separated from HT power cables?

By a minimum of 3 meters Signup and view all the answers

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

To detail special precautions for cable laying in station yards Signup and view all the answers

Why should cables belonging to other departments not be laid in the same trench along with Signal & Telecommunication cables?

To prevent interference between cables Signup and view all the answers

What should be done to prevent water collection in the duct?

Provide suitable covers to the duct Signup and view all the answers

In what order should cables be placed in the same trench, starting from the main track side?

Telecommunication cable, Signalling cable, Power cable Signup and view all the answers

Why should signalling cables for outdoor circuits not be laid above ground?

To avoid mechanical damage to the cable Signup and view all the answers

How should cable supports be spaced when laying cables above ground?

To avoid sag Signup and view all the answers

How should indoor signalling cables be laid?

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

Why should a minimum distance of 5.5 meters be maintained from the centre of the nearest track when laying cables outside the station section?

To avoid mechanical damage to the cable Signup and view all the answers

What should be provided at suitable intervals and at diversion points to mark the route of cables?

Cable markers Signup and view all the answers

Why should cables be firmly held with suitable clamping arrangements when entering the Cable room/Relay room/apparatus case?

To avoid downward displacement Signup and view all the answers

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

Sharp cable bends 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 quiz covers the guidelines for laying cables in railway stations and yards, including special precautions and approved methods.