Safety Precautions for Electrified Sections

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Questions and Answers

What is a key precaution to minimize smoke pollution from steam locomotives?

Initiate sudden starts of steam engines.

Avoid continuous blowing of safety valves. (correct)

Spray coal with water under electric overhead lines.

Allow steam locomotives to stand under OHE insulators.

Why are safety measures important when handling tools near the OHE?

Tools can cause wear to the overhead lines.

It can prevent accidental electrocution. (correct)

It ensures faster loading of fuel.

Tools can impede the operation of locomotives.

What should be avoided to prevent flashover of insulators?

Directing water jets vertically towards OHE.

Stabling steam locomotives under traction structures.

Sudden opening of the blower.

All of the above. (correct)

What is the maximum coal height permitted in the tender for broad gauge locos?

4.28 m above rail level. Signup and view all the answers

What activity is prohibited while loading fuel in electrified zones?

Spraying coal with water. Signup and view all the answers

What could be a consequence of stabling a steam locomotive improperly?

Electrocution of staff. Signup and view all the answers

How should the jet from a hose be directed when in the vicinity of the OHE?

Horizontally far away from the OHE. Signup and view all the answers

What is the purpose of the tripping key mentioned in the content?

To switch off the supply to the watering section. Signup and view all the answers

How is the isolator S1 operated after unlocking it?

By turning the operating handle after releasing it. Signup and view all the answers

What happens after the key K1 is inserted and turned in isolator S1?

K1 is released and the operating handle is locked. Signup and view all the answers

What role does key K2 play in the operation process?

It secures the working area by ensuring power is off. Signup and view all the answers

What is the significance of the double lock feature with the isolators S1 and S2?

It ensures that keys are secured until operations are complete. Signup and view all the answers

Who receives the key K2 after it is released from isolator S2?

The TXR in charge by the authorized person. Signup and view all the answers

Which of the following best describes the process after isolator S1 is opened?

An additional key for S2 is released while securing S1. Signup and view all the answers

What does the term 'permit-to-work' key refer to?

Key K2 that assures the watering section is safe to work on. Signup and view all the answers

Which procedure is necessary for opening the (main) isolator 'L'?

Following additional precautions as per the manual. Signup and view all the answers

What is the definition of an Over-Dimensioned Consignment (ODC)?

A consignment that exceeds standard moving dimensions at any point during transport. Signup and view all the answers

Which of the following dimensions classify a consignment as an ODC for length?

Exceeding 13716 mm for BG and 12192 mm for MG. Signup and view all the answers

How are 'A', 'B', and 'C' class ODCs primarily differentiated?

By their height clearance under fixed structures. Signup and view all the answers

What must be done before moving an ODC in electrified sections?

Obtain sanction from the competent authority. Signup and view all the answers

What is one critical precaution when moving ODCs near overhead electrical equipment (OHE)?

Assume all lines are live unless a power block is in place. Signup and view all the answers

What must be done before any work is conducted within 2 meters of a live OHE?

Secure a ‘permit to work’. Signup and view all the answers

What is the minimum distance a tree must be kept from the nearest live conductor?

4 meters Signup and view all the answers

What is a potential risk during work in the vicinity of electrified sections?

Proximity of a live conductor. Signup and view all the answers

Which of the following precautions is necessary when dealing with fallen wires?

Switch off power and earth the wires. Signup and view all the answers

What can cause a dangerous voltage to be induced in nearby metallic structures?

Proximity of live OHE. Signup and view all the answers

What safety measure should be followed regarding tree branches near live conductors?

Periodically trim branches for necessary clearance. Signup and view all the answers

Which scenario represents a build-up of potential that needs caution?

Return current in the rails causing potential differences. Signup and view all the answers

How are metallic structures in the vicinity of traction conductors made safe?

By bonding and earthing them. Signup and view all the answers

What is a crucial precaution for railway personnel working near 25 Kv ac OHE?

Following general precautions stated in the manual. Signup and view all the answers

What should be done if a worker encounters a fallen wire?

Ensure power is switched off and wire is earthed before touching. Signup and view all the answers

What must be done before restoring supply at the watering station?

Ensure all watering hydrants are closed Signup and view all the answers

Which action happens immediately after turning the permit-to-work key in the isolator switch S2?

The isolator switch handle can be operated Signup and view all the answers

What must the linesman do after closing the interruptor?

Lock the interruptor enclosure Signup and view all the answers

What is the purpose of the key register at each watering station?

To record the exchange of keys between staff Signup and view all the answers

If a key controlling the switching arrangements is lost, who should be notified first?

The TPC over phone Signup and view all the answers

What document must the linesman sign when returning the permit-to-work key?

The Key Register Signup and view all the answers

Why is the direct exchange of keys between persons important?

To ensure safety and accountability Signup and view all the answers

What should be recorded in the Key Register alongside the date?

Description of the key Signup and view all the answers

What happens after the linesman closes isolator S1?

The isolator interlock key is back-locked Signup and view all the answers

What information is NOT required in the Key Register?

Signature of the train driver Signup and view all the answers

What is the primary safety requirement before anyone can climb onto a carriage roof in electrified sections?

Overhead traction wires must be made dead and earthed Signup and view all the answers

Which of the following is NOT allowed on the chimney of a steam locomotive?

Decorative fittings that increase height Signup and view all the answers

What should be confirmed with parties owning locomotives before they operate in electrified sections?

Their operational staff's familiarity with special safety rules Signup and view all the answers

In the interim arrangements for overhead watering in electrified sections, which item is considered a potential hazard?

Long poles or articles that reach the danger zone Signup and view all the answers

What is the significance of having an authorised OHE section representative present during crane operations?

To ensure compliance with safety regulations Signup and view all the answers

What arrangement has been introduced as a long-term measure for watering coaches in electrified sections?

Side filling arrangements instead of overhead filling Signup and view all the answers

Which factor must be taken into consideration when working near overhead equipment?

The distance of overhead wires from ground level Signup and view all the answers

What is the primary purpose of the permit-to-work key in the restoration of supply process?

To close the isolator switch S2 Signup and view all the answers

Which of the following classes of Over-Dimensioned Consignments (ODC) has a gross clearance of less than 152.4 mm?

C class ODC Signup and view all the answers

What must be done immediately after the isolator interlock key is extracted from the double lock?

Insert it into isolator S1 Signup and view all the answers

What is the maximum permissible length for a consignment to avoid being classified as Over-Dimensioned?

12192 mm Signup and view all the answers

What is NOT required to be recorded in the Key Register during key exchanges?

Duration of key usage Signup and view all the answers

Before cutting a cable, which action must be performed regarding the electrical connection?

A low ohmic resistance connection should be established. Signup and view all the answers

In case of loss of a key controlling switching arrangements, which step should be taken first?

Report to the TPC over phone Signup and view all the answers

Which of the following statements about key custody is accurate?

Custody responsibility lies with the person possessing the key Signup and view all the answers

Which condition must be fulfilled before moving an Over-Dimensioned Consignment (ODC) through electrified sections?

Sanction from competent authority must be obtained. Signup and view all the answers

What must the ASM do upon receiving the key back from the linesman?

Start the train immediately Signup and view all the answers

For which type of ODC is clearance measured at 228.6 mm and above from fixed structures required?

A class ODC Signup and view all the answers

During the restoration process, which action is performed directly after the isolator switch handle is closed?

Extract the isolator interlock key Signup and view all the answers

What aspect of key exchanges is emphasized to enhance safety during operations?

Direct exchange between the concerned persons is essential Signup and view all the answers

What is required of the linesman when returning the permit-to-work key?

Sign the Key Register with return time Signup and view all the answers

What is the minimum distance allowed for any work to be conducted from a live OHE?

2 m Signup and view all the answers

What must be done to metallic structures near traction conductors to prevent induction of dangerous voltages?

Bond them together and earth them Signup and view all the answers

Which of the following is true regarding fallen wires near the OHE?

Power must be switched off before touching them Signup and view all the answers

What is the required action regarding tree branches near live conductors?

They must be trimmed periodically to maintain clearance Signup and view all the answers

Which of the following scenarios could lead to a potential difference due to return current in rails?

Proximity of two insulated joints along the track Signup and view all the answers

What must happen before any work is performed above or within 2 meters of live OHE?

A 'permit to work' must be obtained Signup and view all the answers

What is a consequence of failing to keep a proper distance from live conductors?

Hazardous situations with exposure to live circuits Signup and view all the answers

Which of the following is NOT a reason for needing precautions while working near OHE?

Potential build-up of static electricity Signup and view all the answers

What type of current may cause a potential difference between earth and any other metallic mass?

Return current Signup and view all the answers

What precaution should be taken when conducting work in sections equipped for 25 Kv AC traction?

Ensure all tools are insulated Signup and view all the answers

What is the minimum distance that permanent way staff should maintain from the tracks when an electrically hauled train is within proximity?

250 m Signup and view all the answers

During the maintenance of track continuity on electrified rails, what is the primary purpose of a temporary metallic jumper?

To bridge a gap caused by rail fracture Signup and view all the answers

Which guideline must be followed when unloading rails alongside electrified tracks?

Rails must not form a continuous metallic mass greater than 300 m Signup and view all the answers

Which of the following is a requirement when using open or hopper wagons in electrified tracks?

Supervision must be provided by a Permanent Way Mistry Signup and view all the answers

What must be done before loosening or removing fish plates on electrified tracks?

Make temporary connections as mentioned in the guidelines Signup and view all the answers

Which action is prohibited when handling insulated joints in track-circuited areas?

Bridging joints with bare hands Signup and view all the answers

What is the role of gloves when handling disconnected rail ends during maintenance?

To prevent contact with electrified components Signup and view all the answers

What is the consequence of allowing the two components of a discontinuous rail to touch with bare hands?

Increased risk of electric shock Signup and view all the answers

Which personnel is responsible for the approval of the use of Permanent Way tools?

The Chief Engineer of the Railway Signup and view all the answers

What must be ensured with closed wagons used for material trains?

They are kept under supervision at all times Signup and view all the answers

Study Notes

Safety Precautions on Electrified Sections

Induction Effects of 25 kV AC 50 Hz Single Phase Traction: Heavy induction occurs on metallic structures near electrified tracks. This induction is both electrostatic (from high OHE voltage) and electromagnetic (from substation-to-OHE currents).
Precautionary Measures: Workers familiar with DC systems must be aware of added precautions for AC electric systems. Precautions include careful earthing, proper voltage control, and individual earthing for each working party within 1 km.
Inductive Effects on Structures: Metallic structures parallel to tracks experience induced voltage, making earthing necessary for safety. This applies to fences, platforms, and other metal components.
Inductive Effects on External Lines: Inductive effects are present on outside lines like powerlines and clotheslines near electrified tracks. Public awareness is required to ensure safe practices.
Prevention of Smoke Pollution: Steam locomotives contribute to OHE insulator problems. Limiting locomotive idling and exhaust near insulators reduces pollution effects.

Working of Steam and Diesel Locomotives in Electrified Sections

Smoke Pollution: Steam locomotive smoke causes OHE insulator issues and maintenance difficulties. Recommendations include avoiding locomotive idling with the chimney under an insulator.
Exhaust Steam Precautions: Preventing continuous blowing of safety valves, sudden opening of the blower system, and sudden engine starts can prevent flashovers due to exhaust steam.

Working Conditions/Precautions

Standing on Boiler Shell or Tender: Avoid standing on boiler shells or tenders when under live OHE due to electrocution risk.
Fire-Spraying, Fuel Handling, & Tool Use: Be careful when handling tools around OHEs. Do not spray coal or raise tools toward the OHE.
Loading Fuel: Fueling should occur only in yards outside electrified zones. Load height must be restricted.
Watering Locomotives: Avoid climbing tenders to access water tanks or insert funnels. Use operating rods only.
Crane Operation: Crane operation near OHE lines requires presence of an authorized OHE representative to avoid damage.
Decorative Fittings: Avoid attaching decorative pieces to locomotives that could increase effective height making them a hazard.
Outside-Owned Locomotive Precautions: Safety precautions for outside-party locomotives are also important and should be made aware of the rules before working.

Watering of Carriages in Electrified Sections

Precautions: Implement procedures to ensure safety and prevent accidents when watering in electrified areas. This includes proper isolation and grounding.
Placement of watering sections: Avoid placing the watering sections near live overhead wires. A separate watering section is necessary.

Other Operational Guidelines

Key Register: The key register, is required for each station to record the exchange of keys between the ASM and the linesman.
Loss of Keys: If a key is lost, immediate report to personnel is required.
Precautions for Overhead Electrical Failure: If breakage occurs, the appropriate staff needs to be notified and the incident investigated.
Working on Signal Posts & Fittings: Maintenance work near live OHE requires strict precautions, including metallic screens or isolating sections.
Preventing Induction Potentials/Voltage Issues: Grounding metallic structures. Implement precautions to ensure the safety of workers and equipment in electrical areas.
Use of Measuring Tapes: Avoid using steel tapes in electrified areas.
Continuity of Track: During maintenance, temporary connections must be made to avoid disruption.
Movement of oversized equipment: Oversized equipment (ODCs) require special care when moving through electrified areas. Follow guidelines for speed restrictions and clearances.
Handling Pipes: Avoid carrying long pipes, poles, etc. near live wires or placing them within the danger zone.

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Description

This quiz covers essential safety precautions related to electrified sections, specifically focusing on the induction effects of 25 kV AC systems. It highlights the importance of proper earthing measures and the necessary precautions for workers familiar with DC systems. Understanding inductive effects on surrounding structures and public awareness is also emphasized.