Podcast
Questions and Answers
What type of lightning protection device is required at the output of power supply equipment?
What type of lightning protection device is required at the output of power supply equipment?
- Class C/Type-II devices (correct)
- Class A/Type-IV devices
- Class D/Type-III devices
- Class B/Type-I devices
Which of the following is NOT a requirement for earthing wires as outlined for electronic interlocking?
Which of the following is NOT a requirement for earthing wires as outlined for electronic interlocking?
- Should always be coiled (correct)
- Should never be less than 4 Sq.mm cross section
- Should be straight and not coiled
- Should be of copper material
What is the recommended earth value for earthing in electronic interlocking?
What is the recommended earth value for earthing in electronic interlocking?
- Less than two ohms
- Between one and two ohms
- Less than one ohm (correct)
- Greater than two ohms
Which color is recommended for earth wires to ensure quick identification?
Which color is recommended for earth wires to ensure quick identification?
What is an ideal characteristic of the earth wire from the surge protection device to the main earth terminal?
What is an ideal characteristic of the earth wire from the surge protection device to the main earth terminal?
What should be done according to the approved system maintenance manuals for Electronic Interlocking systems?
What should be done according to the approved system maintenance manuals for Electronic Interlocking systems?
Where is the Maintenance Terminal for the Electronic Interlocking system located?
Where is the Maintenance Terminal for the Electronic Interlocking system located?
What should be updated on the centralized server for Electronic Interlocking systems?
What should be updated on the centralized server for Electronic Interlocking systems?
What is necessary for periodic testing of redundant systems?
What is necessary for periodic testing of redundant systems?
Which standards are applicable to the development and implementation of Electronic Interlocking?
Which standards are applicable to the development and implementation of Electronic Interlocking?
What must be done to protect electrical and electronic signaling equipment from lightning?
What must be done to protect electrical and electronic signaling equipment from lightning?
What is stated about equi-potential bonding in lightning and surge protection?
What is stated about equi-potential bonding in lightning and surge protection?
Which of the following systems must be grounded and protected from lightning surges?
Which of the following systems must be grounded and protected from lightning surges?
Flashcards
External Lightning Protection Locations
External Lightning Protection Locations
Lightning protection is needed on top of buildings housing signal and telecommunication equipment.
Class B/Type-I devices location
Class B/Type-I devices location
These devices are placed at the Input of Power Supply Equipment
Class C/Type-II devices location
Class C/Type-II devices location
These devices are placed at the Output of Power Supply Equipment.
Class D/Type-III devices location
Class D/Type-III devices location
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Earthing Wire Distinctive Color
Earthing Wire Distinctive Color
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Electronic Interlocking Maintenance
Electronic Interlocking Maintenance
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Electronic Interlocking Maintenance Terminal Location
Electronic Interlocking Maintenance Terminal Location
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Electronic Interlocking Database Updates
Electronic Interlocking Database Updates
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Redundant System Testing
Redundant System Testing
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Railway Signalling Systems Standards
Railway Signalling Systems Standards
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Lightning Protection for Signalling Equipment
Lightning Protection for Signalling Equipment
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Equi-potential Bonding
Equi-potential Bonding
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National Building Code (NBC)
National Building Code (NBC)
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Study Notes
Electronic Interlocking System Maintenance
- Maintenance is performed per approved manuals
- A general maintenance schedule is provided in Annexure 21-MS3
- Stations with high traffic/speed may require more frequent inspections
- Maintenance terminals are provided in Signal Technician Duty rooms
- Latest station database files are kept updated on a centralized server
- Redundant systems are periodically tested, with checksum verification
Lightning and Surge Protection
- Electrical and electronic signalling equipment needs protection from lightning and surges
- Protection follows National Building Code 2016 (NBC 2016) and IEC 62305 standards
- Equipment like Electronic Interlocking Installations, Object Controllers, BPAC Systems, Axle Counter Systems, and Integrated Power Supply Systems need grounding
- Equipotential bonding protects all equipment in Signal Equipment Rooms
- External Lightning Protection (Class I, II, and III devices) must be provided
- Specific device types (Class B/Type-I, Class C/Type-II, Class D/Type-III) protect different equipment areas
- Earthing must meet specifications, drawings, and codes
- Perimeter earthing around Electronic Interlocking rooms is recommended
- Annual earth value testing (less than 1 ohm) needed during dry seasons
- Copper tape bonding rings cover maximum area and connect to equipment at the nearest point
- Earth wires should be straight and short to minimize impedance
- Earthing wires for interlocking subsystems are color-coded (green/yellow) for easy identification
- Earth wires should be solid copper, with a minimum cross-section of 4 sq. mm, and not coiled
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