Wiring and Relay Racks Overview
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Questions and Answers

What type of fuse system is to be provided for the vital circuit?

  • Old type of fuse
  • High-capacity fuse
  • Approved type fuse auto change over system (correct)
  • Manual changeover fuse system

Air conditioning is mandatory for signalling installations with how many routes?

  • More than 100 routes (correct)
  • Over 200 routes
  • Any number of routes
  • Only for E.I installations

Which conditions justify the provision of air conditioning for installations with less than 100 routes?

  • High route density
  • Poor ventilation
  • External temperature fluctuations
  • Presence of dust or harmful fumes (correct)

What system may be provided at all stations irrespective of the number of routes?

<p>Automatic Fire Detection and Alarm System (C)</p> Signup and view all the answers

What is the requirement for firefighting equipment in relation to the power supply equipment room?

<p>It shall also be kept in the power supply equipment room (B)</p> Signup and view all the answers

Which installations must have data loggers provided?

<p>Only Relay Interlocking Installations (C)</p> Signup and view all the answers

What is the purpose of having suitable standard earthing for control panels and power supply systems?

<p>To ensure safety and reliability (D)</p> Signup and view all the answers

Which of the following is a condition under which an Automatic Fire Suppression System may be provided?

<p>At stations with more than 400 routes (C)</p> Signup and view all the answers

What is the recommended wire size for connections to circuit breakers?

<p>1.5/1.6 sq.mm single strand wire (A)</p> Signup and view all the answers

What should be included to help identify terminals and tags?

<p>Identification markers (C)</p> Signup and view all the answers

How much additional capacity should relay racks have for future expansions?

<p>15% (C)</p> Signup and view all the answers

What type of fuse is preferred for use in circuits?

<p>Non-deteriorating type fuses (C)</p> Signup and view all the answers

What should be the visual indication when a fuse blows?

<p>A visual indication (D)</p> Signup and view all the answers

How should fuse groups be arranged to minimize impact on train operations?

<p>Grouped to have minimum repercussions (A)</p> Signup and view all the answers

What should be used for terminal blocks and tag blocks unless specially permitted otherwise?

<p>Approved types (D)</p> Signup and view all the answers

How should fuses be arranged to aid in fault localization?

<p>In groups facilitating easy fault localization (B)</p> Signup and view all the answers

What is the minimum size for single core conductors used in the internal wiring of relay racks?

<p>1 mm (C)</p> Signup and view all the answers

Which type of wiring is required for connections to plug-in non-proved type relays?

<p>Flexible wire of 16/0.20 mm (B)</p> Signup and view all the answers

What should be used for terminating the connecting wires in the internal wiring of relay racks?

<p>Eyelets/lugs/receptacles (C)</p> Signup and view all the answers

What type of cable should be used for rack to rack wiring?

<p>Multi-core cable with plain annealed copper single core conductor (D)</p> Signup and view all the answers

What is the insulation type required for the conductors in internal wiring?

<p>PVC insulated (D)</p> Signup and view all the answers

How should the cable/entry arrangements be sealed after completing the wiring?

<p>With suitable compound (A)</p> Signup and view all the answers

What is the maximum rating for the flame-retardant PVC insulated wire used?

<p>1100 V (D)</p> Signup and view all the answers

Which of the following is NOT a requirement for wiring in a cabin and locations?

<p>Wiring does not need to be easily accessible (D)</p> Signup and view all the answers

Flashcards

Relay Rack Wiring Requirements

Internal wiring in relay racks must adhere to specific standards for materials, sizes, and termination methods.

Copper Conductors

Use of annealed copper wire (single or multi-strand) for relay rack internal wiring, specified by type and size.

PVC Insulated Wire

Use of PVC insulated and flame-retardant type wiring in relay rack, specific to 1100V.

Cable/Entry Arrangements

Adequate and conveniently located cable entry points for terminals and equipment, to prevent damage to the wiring.

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Wiring Termination Types

Wiring connections must be terminated on approved terminal blocks/tag blocks except in specific cases.

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Rack-to-Rack Wiring

Use specific multi-core cables with copper cores to connect different relay racks, complying with the specification.

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Connection to Relays (Non-Approved)

For plug-in, non-approved relays, use flexible wire of 16/0.20mm size for connections.

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Connection to Relays (Approved)

Use 0.6/1 mm single-strand multi-core cable for connections to proved-type relays.

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Relay Wiring

Relay connections on the same rack should be direct, avoiding intermediary components like terminal blocks.

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Terminal Identification

Each relay terminal needs a marker to identify the connected circuits.

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Relay Rack Capacity

Relay racks should have extra space for potential future additions (15% extra equipment).

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Relay Rack Chart

Maintain charts documenting relay positions and contact usage (spare vs. used).

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Fuse Grouping

Group fuses to limit disruption to train operation if a fuse blows.

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Fuse Visual Indication

Blown fuses should preferably provide a clear visual signal.

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Fuse Circuit Protection

Each circuit group must be protected with fuses within easy reach for quick fault identification.

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Fuse Replacement

Fuses should be replaceable without affecting other circuits or posing a safety risk.

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Air Conditioning Provision for Signalling Installations

Air conditioning is optional for signalling installations with less than 100 routes, but potentially required for those prone to dust, harmful fumes, or extreme temperatures, contingent on PCSTE and PCEE agreement. Larger installations (more than 100 routes) and critical installations (E.I.) may require air conditioning.

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Fire Detection System Requirements

Automatic fire detection and alarm systems are standard for all stations. Automatic fire suppression systems are recommended for installations with more than 400 routes, but may be provided at other critical stations/junctions with approval.

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Data Logger Provision

Data loggers are mandatory at Relay Interlocking Installations.

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Electrical Department Responsibility

Maintenance of AC equipment is the responsibility of the Electrical Department.

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Circuit Fuse Auto Changeover

Automated switching of vital circuit fuses is required and must be of an approved type.

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Power Supply Arrangement

Signalling installations must follow Chapter 16 guidelines for power supply.

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Location of AC Switch

The switch to control the air conditioning system should be found outside the relay room.

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Standard Earthing

Control panels, power supplies, switchboards, transformers, and inverters require appropriate standard earthing connections.

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Study Notes

Wiring and Relay Racks

  • Wiring in equipment must follow IRS specification No. S 23.
  • Wiring should be neat and accessible for maintenance.
  • Wiring terminations should use approved terminal blocks.
  • Cable/entry arrangements should be adequate, accessible, and protect wiring.
  • Internal wiring uses plain annealed copper conductors (PVC insulated, flame-retardant, 1100 V grade).
  • Conductor sizes for single core: 1mm
  • Conductor sizes for multicore (each core): 1mm or 0.6mm
  • Conductor sizes for flexible insulated wire: 16/0.20mm
  • Conductor sizes for flexible multi-strand wire: 3/0.75mm
  • Rack-to-rack wiring uses 1/0.6mm or 16/0.2mm cables.
  • Wiring connections use eyelets/lugs/receptacles (unless specified otherwise).
  • Relay connections using plug-in, non-proved type use 16/0.20mm wire.
  • Relay connections using proved type use 0.6/1mm single-strand multi-core cable.
  • Cable connections to blocks/indicators use 1mm single-strand wire.
  • Connections to circuit breakers, lever locks use 1.5/1.6mm single-strand wire.
  • Relay-to-relay wiring on the same rack should be direct.
  • Identification markers are required for terminals.
  • Relay racks should have sufficient capacity for future installations.
  • Relay positions and contact analysis charts are required.
  • Additional relay space should be provided.
  • Cartridge fuses should be non-deteriorating type with different color codes.
  • Fuse grouping minimizes train operation impact.
  • Fuse blowing should provide visual indication.
  • Each circuit group has fuse protection.
  • Fuse replacement is easy and safe.
  • Cartridge fuse links, as well as terminal blocks/tag blocks, should be approved type.
  • Terminal boards connect circuits with suitable links.
  • Vital circuits should use an approved automatic changeover system.

Power Supply Arrangements

  • Power supply systems for signalling installations follow Chapter 16.
  • Air conditioning may be provided for installations with more than 100 routes.
  • Air conditioning for installations with less than 100 routes may be needed based on specific conditions (dust, harmful fumes, extreme temperatures).
  • AC equipment is maintained by the electrical department.
  • AC switches are outside the relay room.
  • Automatic fire detection and alarm systems are used.
  • Automatic fire suppression systems are considered for installations with more than 400 routes.

Lightning, Surge Protection, and Earthing

  • Lightning and surge protection, and earthing, follow Section 5 of the chapter.

Testing and Commissioning

  • Indoor wiring testing precedes system testing.
  • Simulation testing verifies field gears (track circuits, signals, points) accuracy.
  • Wiring integrity testing ensures correctness before outdoor gear connection.
  • Commissioning follows testing procedures (Paras 19.8.5 to 19.8.12).
  • Recommended checklist is available in the Annexure.

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Related Documents

Section 3: Installation of Relay Interlocking PDF

Description

This quiz covers important aspects of wiring in equipment according to IRS specifications. It focuses on wiring standards, conductor sizes, termination methods, and relay connections. Test your understanding of these critical components in system wiring and maintenance.

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