Design Criteria of Signalling Circuits

A row of at least two red lights indicates that the track circuit is occupied.

The red lights shall be extinguished when the track circuit is not occupied.

The availability of the power supply should be suitably indicated if not provided in the Change over Panel in the SM room.

<p>Approach track circuits must be indicated on an illuminated diagram.</p> Signup and view all the answers

<p>Advance approach warnings are indicated by flashing lights and an audible bell.</p> Signup and view all the answers

<p>A red indication lights on the control panel, coupled with an audible warning.</p> Signup and view all the answers

<p>Pressing a push button is required to silence the audible warnings.</p> Signup and view all the answers

<p>The press button must be activated again for subsequent signal failures.</p> Signup and view all the answers

<p>The two types are Route Setting Type and Non-route Setting Type.</p> Signup and view all the answers

<p>Dual OFC reduces the extent of copper cables and provides an alternate path in case of failures.</p> Signup and view all the answers

<p>Adhering to approved signalling plans ensures compliance with the specifications and standards required for safe operations.</p> Signup and view all the answers

<p>The areas should be clearly distinguished by using different colours.</p> Signup and view all the answers

<p>Operating members should be provided on the illuminated diagram in geographical order.</p> Signup and view all the answers

<p>Drawings and designs should follow typical templates, RDSO's Standard circuits, and industry best practices.</p> Signup and view all the answers

<p>A domino type panel is preferably used for installations likely to have additional facilities.</p> Signup and view all the answers

<p>The route may be set with individual operation of points.</p> Signup and view all the answers

<p>The Route Setting installations operate on the 'Entry/Exit' principle.</p> Signup and view all the answers

<p>Signals can be cleared using an individual push button in conjunction with a group button, or by individual switches for each signal.</p> Signup and view all the answers

<p>Emergency operation of points is recorded on a counter for each individual operation.</p> Signup and view all the answers

<p>The desired overlap beyond the exit signal of the route can be selected and set.</p> Signup and view all the answers

<p>Distinctive colors help in readily distinguishing between various signal controls.</p> Signup and view all the answers

<p>A group slot cancellation button must be operated along with the entrance/exit button.</p> Signup and view all the answers

<p>The control panel must facilitate individual operation of points and slotting for adjoining cabins and level crossings.</p> Signup and view all the answers

<p>Push buttons allow for individual operation of points, ensuring precise control.</p> Signup and view all the answers

<p>To ensure that they can only be released for use under controlled conditions, preventing unauthorized access.</p> Signup and view all the answers

<p>By releasing a control from the control panel.</p> Signup and view all the answers

<p>It should not be possible to clear the signal for the concerned routes.</p> Signup and view all the answers

<p>120 seconds.</p> Signup and view all the answers

<p>Upon physical verification by SM if any back lock track circuit shows occupation.</p> Signup and view all the answers

<p>The cancellation buttons are operated after the points are locked due to a failure.</p> Signup and view all the answers

<p>Back lock track circuits must be clear before movement.</p> Signup and view all the answers

<p>Detailed documentation for alterations, duration of Non-Interlocking/Disconnection, and sequence of working.</p> Signup and view all the answers

<p>Movement of armature and contact carriage, corrosion of components, and dust accumulation on contacts.</p> Signup and view all the answers

<p>25 to 30 years.</p> Signup and view all the answers

<p>The relay should be replaced if warranted by the actual condition and usage.</p> Signup and view all the answers

<p>Wiring must comply with IRS specification No.S 23 and should be neat and accessible.</p> Signup and view all the answers

<p>It ensures that the relay is securely held in place, preventing malfunction.</p> Signup and view all the answers

<p>Arcing can lead to deterioration of the contacts and potentially cause failures.</p> Signup and view all the answers

<p>They should be adequately sized, conveniently located, and sealed to protect wires from damage.</p> Signup and view all the answers

<p>Corrosion, rusting, and the presence of fungus or ants inside the relay casing.</p> Signup and view all the answers

<p>The periodicity of tests is outlined in Section 21.6.1 of the chapter.</p> Signup and view all the answers

<p>The personal responsibility falls on the ASTE/DSTE concerned.</p> Signup and view all the answers

<p>Maintenance must be conducted as per the approved system maintenance manuals.</p> Signup and view all the answers

<p>It should be performed once every five years or earlier if interlocking is altered.</p> Signup and view all the answers

<p>The Railways may prescribe more frequent inspections if deemed necessary.</p> Signup and view all the answers

<p>It should be provided in the Signal Technician Duty room.</p> Signup and view all the answers

<p>They should be kept updated in a centralized server as specified.</p> Signup and view all the answers

<p>Periodic testing of redundant systems should be carried out, with checksums verified during inspections.</p> Signup and view all the answers

<p>They ensure that all gates are closed and locked against road traffic before allowing any signal to clear.</p> Signup and view all the answers

<p>Proving track circuits is not required for Clearing Calling On signals since it detects points and interlocked level crossings.</p> Signup and view all the answers

<p>Approach locking ensures that signals remain effective and locked from a predetermined point on approach to a manual stop signal.</p> Signup and view all the answers

<p>Conflicting routes must be achieved through route interlocking electric circuits at the route initiation stage.</p> Signup and view all the answers

<p>Proving of berthing track circuits and other conditions like stop signal ahead being blank is not needed for clearing shunt signals.</p> Signup and view all the answers

<p>Signals must be operated by individual switches or push buttons in conjunction with a group push button for the selected route.</p> Signup and view all the answers

<p>It should be provided when block control uses an Absolute Block System with control panels and block instruments at different locations.</p> Signup and view all the answers

<p>The cancellation of a slot requires certain confirmations or conditions to be met, ensuring coordinated operations.</p> Signup and view all the answers

<p>SSDAC, HA-SSDAC, and MSDAC.</p> Signup and view all the answers

<p>To enable telephone communication for maintenance purposes.</p> Signup and view all the answers

<p>Multi unit colour light type for main signals and position light type for shunt signals.</p> Signup and view all the answers

<p>They must have track circuit control, overload protection, and cross protection.</p> Signup and view all the answers

<p>A telecommunication cable or a separate telecom cable.</p> Signup and view all the answers

<p>Whether to use signal cable, quad cable, or OFC.</p> Signup and view all the answers

<p>They must be of an approved type to detect leakage to earth in cable conductors.</p> Signup and view all the answers

<p>Grouping location boxes and providing one socket for communication.</p> Signup and view all the answers

<p>Air conditioning is required for every signalling interlocking installation with more than 100 routes.</p> Signup and view all the answers

<p>Cartridge type fuses should use different color codes for different current ratings and be non-interchangeable.</p> Signup and view all the answers

<p>Fuses should be grouped to minimize repercussions on train operation when one blows.</p> Signup and view all the answers

<p>Terminal boards must be provided with suitable links for isolating the two sides of connected circuits.</p> Signup and view all the answers

<p>Air conditioning may be provided if installations are prone to dust or in extreme temperature areas.</p> Signup and view all the answers

<p>Blowing fuses should preferably give a visual indication.</p> Signup and view all the answers

<p>Non-deteriorating type cartridge fuses are preferred for such installations.</p> Signup and view all the answers

<p>Cartridge fuse links must be of approved type.</p> Signup and view all the answers

<p>The 'SM Key' relay system provides protection against unauthorized operations through redundancy.</p> Signup and view all the answers

<p>During E.I. startup, an 'All Un Block' option must be manually executed after a time delay of at least 120 seconds.</p> Signup and view all the answers

<p>The health of the E.I system is indicated by a blinking green LED or indicator on the Control Terminal.</p> Signup and view all the answers

<p>Emergency operation can only be performed by inserting an emergency key after confirming that interlocking is free.</p> Signup and view all the answers

<p>The 'two-step' process ensures that emergency operations are protected against unintended operations.</p> Signup and view all the answers

<p>Blocking of a function is represented by a different mark or color over the concerned function on the Control Terminal.</p> Signup and view all the answers

<p>Controls can be switched via a manual switch or password, allowing flexibility in operations.</p> Signup and view all the answers

<p>Each operation is controlled through two output relays derived from two different output bits from separate output cards.</p> Signup and view all the answers

<p>IEC and CENELEC provide relevant international standards.</p> Signup and view all the answers

<p>RDSO Specifications and Technical Advisory Notes (TAN) are applicable.</p> Signup and view all the answers

<p>Lightning protection must comply with NBC 2016 and IEC 62305.</p> Signup and view all the answers

<p>The earth value should be less than one ohm.</p> Signup and view all the answers

<p>Class B/Type-I, Class C/Type-II, and Class D/Type-III devices are required.</p> Signup and view all the answers

<p>Equi-potential bonding is essential for all equipment.</p> Signup and view all the answers

<p>Perimeter earth should be established around the room as per approved specifications.</p> Signup and view all the answers

<p>Grounding effectiveness should be tested annually.</p> Signup and view all the answers

<p>I/O port correspondence check between Application logic and Interface circuits, along with logic and interlocking testing Control Table.</p> Signup and view all the answers

<p>FAT should preferably be conducted at factory premises to ensure optimal setup conditions and oversight.</p> Signup and view all the answers

<p>Wires must be of adequate size to limit voltage loss to no more than 0.5%.</p> Signup and view all the answers

<p>Correspondence tests for new additions and intercommunication tests between sub-racks, if applicable.</p> Signup and view all the answers

<p>The power supply for fans should be fed from a separate external supply that is completely isolated from the Electronic interlocking supply.</p> Signup and view all the answers

<p>Adequate redundancy in power supply arrangements should be provided as per approved specifications and guidelines.</p> Signup and view all the answers

<p>Control Table testing should include negative testing to evaluate system responses to fault conditions.</p> Signup and view all the answers

<p>FAT and SAT should be conducted by separate officials wherever feasible to maintain accountability and oversight.</p> Signup and view all the answers