Railway Signaling Safety Regulations

Special measures must be taken to protect operating staff during mechanical point operation.

Point detection and point detection repeat circuits shall use ac-immunized relays.

The maximum permissible length is 2800 meters for double line point machines at 400 volts.

<p>Any direct or indirect contact with the 25 KV conductors is considered dangerous.</p> Signup and view all the answers

<p>Three-phase point machines are inherently immune to induced voltage.</p> Signup and view all the answers

<p>It can create a potential difference at insulated joints or between a fractured rail and surrounding earth.</p> Signup and view all the answers

<p>Insulators are required to protect operating and maintenance staff from induced voltages transmitted through the rods.</p> Signup and view all the answers

<p>Insulated rod joints must be as per approved drawings.</p> Signup and view all the answers

<p>Staff must use insulated tools and follow approved safety instructions.</p> Signup and view all the answers

<p>The factor of safety is 1.5.</p> Signup and view all the answers

<p>Induced voltage may appear in circuits when there is significant parallelism to the track.</p> Signup and view all the answers

<p>Mechanical point operation requires special protective measures for staff, while electric operation has defined length restrictions.</p> Signup and view all the answers

<p>Only insulated tools should be used as per approved instructions.</p> Signup and view all the answers

<p>Induced voltages can develop unexpectedly due to increases in traction current.</p> Signup and view all the answers

<p>A contact that is normally safe could result in an electric shock.</p> Signup and view all the answers

<p>It increases the risk of potential differences between adjacent rails, leading to dangerous situations.</p> Signup and view all the answers

<p>700 mm.</p> Signup and view all the answers

<p>To ensure safety while working on or near electrical equipment.</p> Signup and view all the answers

<p>Completion of specified works as per the chapter's provisions.</p> Signup and view all the answers

<p>A certificate of clearance from the Department of Telecommunications (DOT).</p> Signup and view all the answers

<p>Implementation of a wire mesh screen on the working platform.</p> Signup and view all the answers

<p>To eliminate overhead wires for enhanced safety and ease of maintenance.</p> Signup and view all the answers

<p>Annexure 22-A1.</p> Signup and view all the answers

<p>Signal Clearance Diagrams for various track configurations.</p> Signup and view all the answers

<p>The standard height for the center line of a red signal is approximately 3.65 meters above rail level.</p> Signup and view all the answers

<p>No part of a signal without a route indicator shall normally be higher than 5.2 meters above rail level.</p> Signup and view all the answers

<p>No OHE structures shall be provided in the same track space for at least 600 meters in rear of the signals.</p> Signup and view all the answers

<p>3.25 m</p> Signup and view all the answers

<p>If a portal drop arm must be located in the rear of a signal, it should be mounted on an offset bracket.</p> Signup and view all the answers

<p>Precautions for signals with junction indicators between tracks must follow the same specifications as for signals without junction indicators.</p> Signup and view all the answers

<p>It requires lower minimum mast settings for distances compared to signals without approach signals.</p> Signup and view all the answers

<p>The Official in charge (Signal) of the section is responsible for checking the visibility of the signals.</p> Signup and view all the answers

<p>3.72 m</p> Signup and view all the answers

<p>If visibility is inadequate, suitable speed restrictions should be imposed and steps should be taken to improve visibility.</p> Signup and view all the answers

<p>It is crucial for ensuring that signals are clearly visible to the operators for safe operation.</p> Signup and view all the answers

<p>For details on cable laying in RE areas, it is recommended to refer to Chapter 15 of SEM.</p> Signup and view all the answers

<p>2.75 m</p> Signup and view all the answers

<p>Up to 270 m</p> Signup and view all the answers

<p>Two meters.</p> Signup and view all the answers

<p>2.90 m</p> Signup and view all the answers

<p>The Engineering Inspector.</p> Signup and view all the answers

<p>It should not be touched unless power is switched off and suitably earthed.</p> Signup and view all the answers

<p>Following these settings optimizes signal visibility and enhances safety for train operations.</p> Signup and view all the answers

<p>At least four meters.</p> Signup and view all the answers

<p>Measuring tapes, tools, and materials that could fall.</p> Signup and view all the answers

<p>Intimation must be given in writing to the Traction Distribution Officer.</p> Signup and view all the answers

<p>The Traction Power Controller.</p> Signup and view all the answers

<p>They should be cut or trimmed periodically.</p> Signup and view all the answers

<p>700 mm</p> Signup and view all the answers

<p>Insulated tools</p> Signup and view all the answers

<p>Cables</p> Signup and view all the answers

<p>Certificate of clearance from DOT</p> Signup and view all the answers

<p>Provisions of wire mesh screen must be installed.</p> Signup and view all the answers

<p>300 meters</p> Signup and view all the answers

<p>Nominated officers</p> Signup and view all the answers

<p>To prevent rail voltage from being passed to the main run of rods.</p> Signup and view all the answers

<p>Completion of specified safety provisions</p> Signup and view all the answers

<p>40 mm</p> Signup and view all the answers

<p>Annexures and Manual of AC Traction</p> Signup and view all the answers

<p>To ensure safe operation by preventing electrical interference.</p> Signup and view all the answers

<p>Provide additional insulators on each rod.</p> Signup and view all the answers

<p>When operating on electrified lines adjacent to non-electrified tracks.</p> Signup and view all the answers

<p>They must be provided between the same two sets of rollers and guides.</p> Signup and view all the answers

<p>Not less than 40 mm.</p> Signup and view all the answers

<p>They must possess a copy of the rules and ensure that their staff are acquainted with them.</p> Signup and view all the answers

<p>Written authority must be obtained from a competent official confirming that the equipment is dead and earthed.</p> Signup and view all the answers

<p>They must protect the line according to General Rule 3.62.</p> Signup and view all the answers

<p>They ensure reliable electrical circuit continuity and proper earthing in case of leakage of current.</p> Signup and view all the answers

<p>Two flexible copper bonds are provided at each rail joint under the fishplates.</p> Signup and view all the answers

<p>They should report the defects immediately to the Traction Power Controller.</p> Signup and view all the answers

<p>All electrical equipment, power lines, or cables must be regarded as being 'live' at all times.</p> Signup and view all the answers

<p>The return current mainly flows through the rail.</p> Signup and view all the answers

<p>Staff must take precautionary measures as induced voltages may develop due to an increase in current in the traction lines.</p> Signup and view all the answers

<p>Contact with 25 KV conductors can be avoided by strictly prohibiting any direct or indirect interaction with these live conductors.</p> Signup and view all the answers

<p>Insulated tools are essential to prevent electric shocks from return currents that can create a potential difference between the rails.</p> Signup and view all the answers

<p>The pressure of return current in rails is influenced by potential differences between adjacent rails, fractured rails, and insulated versus non-insulated rails.</p> Signup and view all the answers

<p>Staff must observe the provisions of Section 'J' of the permanent way manual regarding safety protocols.</p> Signup and view all the answers

<p>An increase in traction line current can lead to the appearance of induced voltage in signaling and telecommunication circuits.</p> Signup and view all the answers

<p>If a contact, typically safe, becomes dangerous, precautions should be reinforced to avoid the risk of electric shock due to potential circuit breaks.</p> Signup and view all the answers

<p>Broken fish plates and rail bonding can lead to potential differences, aggravating the risks associated with return currents.</p> Signup and view all the answers

<p>Mild steel straps or G.I. wire ropes.</p> Signup and view all the answers

<p>To reduce the resistance of the current to the minimum.</p> Signup and view all the answers

<p>They connect structures to the running rails to ensure proper earthing.</p> Signup and view all the answers

<p>It can result in unsafe conditions, including the charge of the structure.</p> Signup and view all the answers

<p>Employees need to be cautious of the potential difference between rails and earth.</p> Signup and view all the answers

<p>To ensure the continuity of the return current path.</p> Signup and view all the answers

<p>It creates a potential difference that can be hazardous.</p> Signup and view all the answers

<p>The supply from the substation must be switched off.</p> Signup and view all the answers

<p>Linen tapes should be used instead of steel or metallic tapes.</p> Signup and view all the answers

<p>Workers must not come within 2 meters of the overhead equipment.</p> Signup and view all the answers

<p>Temporary metallic jumpers of approved design should be provided.</p> Signup and view all the answers

<p>All materials should be kept clear from the top of foundation blocks.</p> Signup and view all the answers

<p>They should use gloves of approved quality and avoid touching with bare hands.</p> Signup and view all the answers

<p>Temporary connections must be made before loosening or removing fishplates.</p> Signup and view all the answers

<p>Rails should be kept clear of sand for a length of 21.5 meters beyond section insulators.</p> Signup and view all the answers

<p>The Mistry ensures tools and body parts do not enter the 'danger zone'.</p> Signup and view all the answers

<p>To prevent the inadvertent release of interlocking due to voltage variations.</p> Signup and view all the answers

<p>400 Volts.</p> Signup and view all the answers

<p>Sectionalized power supply units for each direction.</p> Signup and view all the answers

<p>It should not be less than 400 V AC.</p> Signup and view all the answers

<p>95 Volts/km.</p> Signup and view all the answers

<p>Approximately 3.65 meters.</p> Signup and view all the answers

<p>No part should be higher than 5.2 meters.</p> Signup and view all the answers

<p>At least 600 meters.</p> Signup and view all the answers

<p>The signal should be mounted on an offset bracket.</p> Signup and view all the answers

<p>The Official in charge (Signal) of the section.</p> Signup and view all the answers

<p>Impose suitable speed restrictions and improve visibility.</p> Signup and view all the answers

<p>Precautions must follow those specified under Para 22.3.4.</p> Signup and view all the answers

<p>Refer to Chapter 15 of SEM.</p> Signup and view all the answers

<p>Staff should wear rubber gloves and use tools with insulated handles.</p> Signup and view all the answers

<p>Special precautions must be taken by splitting the circuits into sections or earthing them.</p> Signup and view all the answers

<p>The cable terminals must be printed red to remind maintenance staff of the danger.</p> Signup and view all the answers

<p>Establish an electrical connection of low resistance between the two parts being separated.</p> Signup and view all the answers

<p>Staff should be equipped with insulated tools such as box spanners, pliers, and screwdrivers.</p> Signup and view all the answers

<p>Tools with insulated handles or plastic sleeves on the handles should be supplied.</p> Signup and view all the answers

<p>They must familiarize themselves with the instructions for the treatment of persons suffering from electric shocks.</p> Signup and view all the answers

<p>Rubber mats should be used to insulate themselves from the ground.</p> Signup and view all the answers

<p>3.25m</p> Signup and view all the answers

<p>It requires lower minimum mast heights compared to signals without approach signals.</p> Signup and view all the answers

<p>2.75m</p> Signup and view all the answers

<p>3.72m</p> Signup and view all the answers

<p>2.75m</p> Signup and view all the answers

<p>3.25m</p> Signup and view all the answers

<p>3.25m</p> Signup and view all the answers

<p>The visibility of the signal must be prioritized in the mast-setting process.</p> Signup and view all the answers

<p>3.25 m</p> Signup and view all the answers

<p>At least 600 m</p> Signup and view all the answers

<p>Use an off-set bracket for the signal.</p> Signup and view all the answers

<p>5.2 m</p> Signup and view all the answers

<p>3.05 m, 2.90 m, and 2.75 m</p> Signup and view all the answers

<p>Colour light signals with route indicators.</p> Signup and view all the answers

<p>Shorten drop arms or reduce the signal's height.</p> Signup and view all the answers

<p>Signals should be on the side opposite to the OHE masts.</p> Signup and view all the answers

<p>Continuity bonds ensure a continuous return current path, preventing potential dangers and maintaining safe operating conditions.</p> Signup and view all the answers

<p>Cross bonds connect adjacent tracks to reduce electrical resistance, enhancing the efficiency of current flow.</p> Signup and view all the answers

<p>Structure bonds connect supporting structures to running rails to ensure proper earthing and prevent electric shock.</p> Signup and view all the answers

<p>The major risk is electric shock from accidental contact with the live overhead equipment.</p> Signup and view all the answers

<p>Removing these bonds can lead to unsafe conditions and potential electrical hazards for workers.</p> Signup and view all the answers

<p>Precautions must be taken to prevent direct contact with live conductors and manage potential voltage build-up.</p> Signup and view all the answers

<p>Failure to maintain these connections can lead to hazardous electric shocks for personnel working nearby.</p> Signup and view all the answers

<p>These structures must be bonded to the rails to ensure safety and prevent electrical hazards.</p> Signup and view all the answers