Wiring and Relay Racks Overview

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Blown fuses should preferably provide a clear visual signal.

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

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

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.

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.

Data loggers are mandatory at Relay Interlocking Installations.

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

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

Signalling installations must follow Chapter 16 guidelines for power supply.

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

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