Safety Precautions on Electrified Sections

The opening key for an interruptor is only accessible after opening the interruptor's enclosure. This prevents unauthorized access.

The tripping key for an interruptor is locked until the interruptor is opened to switch off supply. It is then extracted.

Isolators require a key from the ASM (on duty) to be opened. This is a safety measure.

A key obtained (key K1) after opening an isolator locks the interruptor and that isolator. It's used to control further operations.

Key K2 is the final key required to ensure complete power cut and grounding, received by TXR in charge. It signals a final authorization.

Only linesman under the Traction Foreman (OHE) are authorized to operate interruptors/isolators controlling overhead traction power.

The system uses a sequence of locking keys to ensure the power supply is completely cut and grounded before work can proceed.

Linesmen must report to the ASM at least 30 minutes before scheduled train arrival.

Linesmen cannot leave their duty until properly relieved and introduced to the ASM by their reliever.

ASM on duty keeps keys in glass key box, not in a bunch, with painted descriptions.

ASM gives key to linesman to isolate watering section. Returned to ASM before electric trains with raised pantographs enter.

TXR-in-charge confirms watering key's accuracy and section match.

Keys can be handed over even before train arrival to save time when watering carriages, if isolation doesn't impact other train movement.

Electric locomotives with raised pantographs are not allowed to enter a watering section until the linesman returns the key.

A register used to record the exchange of keys related to watering operations.

The act of handing over the key for an interrupting enclosure to the linesman requests a power block.

The area within 2 meters of Overhead Electrified Equipment (OHE) is considered a danger zone due to high voltage risks.

Using closed wagons for transporting materials on electrified tracks minimizes the risk of items falling onto the live rails, reducing the chance of electrical contact.

Loading and unloading open wagons on electrified tracks requires the supervision of an Engineering Official to ensure no tools or workers enter the danger zone.

Track maintenance personnel should stay clear of the tracks and avoid contact with rails when an electrically hauled train is within 250 meters.

When unloading rails alongside electrified tracks, ensure that the rails don't form a continuous metallic mass exceeding 300 meters, to prevent accidental current flow.

During track maintenance, continuity of rails on electrified tracks must be maintained to ensure uninterrupted power flow.

Temporary metallic jumpers with approved designs are used to bridge gaps during track maintenance, ensuring continuous electrical flow.

When working on discontinuous rails, gloves of approved quality must be used to prevent accidental contact with the rails.

In track-circulated areas with insulated joints, these points must not be bridged with bare hands or any metallic article due to electric current.

Permanent way tools and gloves must be used according to the Chief Engineer's approval for safe and efficient work on electrified tracks.

A 10cm wide red band painted around a signal post 3 meters above the rail level to alert staff of potential hazards.

The flow of electricity back to the source through the rails, which can cause a voltage buildup at points like insulated joints, broken rails, or between rails and earth.

A break in the rails where two sections are separated by an insulator, preventing direct electrical connection.

A broken section of the rail, creating a potential difference at the break.

Tools specifically designed and authorized by the Chief Signal and Telecommunication Engineer for safe work on installations connected to the rails.

Voltage generated in circuits due to the magnetic field created by load currents or short circuits in the traction system.

Connecting circuits to earth to dissipate dangerous voltage build-up.

Protective gear used to prevent electric shock when working near live circuits.

Dividing large circuits into smaller sections to reduce the length of parallel sections and minimize induction potential.

A set of safety procedures required for workers operating in the vicinity of 25 kV AC electrified lines, protecting both personnel and equipment.

A shipment whose length, width, or height exceeds standard moving dimensions at any point during its journey.

ODCs are classified based on their clearance from fixed structures, with 'A' class ODCs having a minimum 228.6 mm clearance.

Standard dimensions for freight shipments, ensuring smooth movement within infrastructure.

Different standard dimensions apply for Broad Gauge (BG) and Meter Gauge (MG) railway lines.

ODCs have specific height limits at both the center and corners of the consignment.

A designated area on the railway track where carriages can be watered, marked by "Danger Limit Boards" on the overhead traction wires.

The person responsible for overseeing the safe watering of carriages on the railway track, ensuring all procedures are followed.

Badges given to staff authorized to go on the roof of carriages for watering, providing proof of permission.

A set of rules to ensure safe watering operations, avoiding contact with live overhead traction wires.

A designated spot for the watering staff to gather before and after watering operations, for coordination and safety.

The process of ensuring all watering operations are finished, staff are safely back on the ground, and equipment is secured.

Rules ensuring the hydrant is not opened before the hose is inserted into the carriage tank and the hose is not withdrawn before the hydrant is closed.

The process of disconnecting the overhead traction wires in a specific section for watering operations. This ensures safety by preventing electrical contact during watering.

A connection that equalizes the electrical potential between the earth systems of the petroleum siding, track, and overhead traction installations. This prevents sparks during loading/unloading, ensuring safety.

Sections in the track, contact wires, or catenary wires that are electrically isolated. This prevents stray currents from flowing into surrounding areas.

Continuous connections along the rails (longitudinal) and across them at regular intervals (transverse). This ensures proper electrical flow and prevents sparking.

Ground connections with a specific resistance of 10 ohms installed on each side of insulated joints. This helps drain stray currents and improves safety during petroleum operations.

A minimum distance of 2 meters must be maintained between live overhead traction equipment and personnel or other equipment. This minimizes the risk of electrical shock.

During service operations, the continuity of the track and contact wire must be established before the link between the track and petroleum facility is opened. This ensures safe electricity flow.

These switches connected to overhead traction systems are kept open during petroleum operations, isolating the section and making the overhead system dead and earthed.

Petroleum products should only be fueled using dedicated fueling arrangements to prevent sparks and ensure safety.

An ODC can be moved through an electrified section if the minimum height of contact wires allows for safe passage, with speed restrictions and potential power cut-offs as necessary.

When moving an ODC in an electrified section, the decision to switch off power is based on the specific ODC's clearance and potential for contact.

An authorized representative from Traction Distribution obtains confirmation from the TPC that power is off before allowing an ODC to enter a section.

Any metallic parts of rubber tyred vehicles transported on wagons through electrified areas must be earthed to prevent induction.

The overhead equipment (OHE) structure can partially obstruct signals and affect the flow of traction return currents on sections with track circuits.

When working near live overhead equipment (OHE), staff must either be protected by a metallic screen or ensure the power is completely switched off and a "permit to work" is obtained.

If a catenary or contact wire breaks and falls on the track, the fault current might damage signalling equipment. Staff must promptly notify the signal maintenance and operating staff and suspend any abnormal equipment operation.

Staff are not allowed to work on a signal post or its fittings within 2 meters of a live 25 kV OHE unless it's protected by a metallic screen, or power is switched off and a permit to work is obtained.

An authorized representative from the Signal Department must submit a certificate confirming that all signalling circuits and equipment are working correctly after work on the OHE.

The area within 2 meters of Overhead Electrified Equipment (OHE) is considered a danger zone due to the high voltage risks.

Using closed wagons minimizes the risk of transported materials falling onto live rails, reducing the chance of electrical contact and accidents.

Loading and unloading open wagons on electrified tracks must be supervised by an Engineering Official to ensure no tools or workers enter the danger zone.

Track maintenance personnel should stay clear of the tracks and avoid contact with rails when an electrically hauled train is within 250 meters.

In track-circulated areas with insulated joints, these points must not be bridged with bare hands or any metallic article due to electric current.