Safety Regulations for OHE Operations

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Questions and Answers

What is the primary purpose of Form ETR-1?

To record incidents of train delays

To schedule train arrivals

To block lines for electric traction purposes (correct)

To issue permits for maintenance work

Which parts are included in the Form ETR-1?

Part A, Part B, and Part C

Part A and Part B (correct)

Part A, Part B, Part C, and Part D

Part A, Part C, and Part D

What should messages sent over the telephone include?

Only the names of the parties involved

Confirmation of arrival times

Exchange of Private Numbers (correct)

A detailed report

What information is NOT typically included in Form ETR-1?

Details about train schedules Signup and view all the answers

When is a carbon copy of the block message required?

Any time local blocks are arranged Signup and view all the answers

What is the minimum number of independent earths required for each working party?

Two independent earths Signup and view all the answers

How far apart must intermediate earths be provided if working parties are more than 100 meters apart?

Not exceeding 100 meters Signup and view all the answers

What should be used when providing temporary earth on the OHE after it has been made dead?

Discharge / earthing pole assembly specifically designed for the purpose Signup and view all the answers

Where should the earthing clamp be fixed when securing it to a mast?

At least one span away from the work site Signup and view all the answers

What is the minimum cross-section required for the cable used in the earthing system?

40 mm2 Signup and view all the answers

What preliminary action must be taken before commencing work on the OHE?

Obtain a permit-to-work to ensure power supply is switched off Signup and view all the answers

In a single-rail-track-circuited section, where should the earthing clamp be fixed?

To the traction rail, which is the non-track-circuit rail Signup and view all the answers

What is the correct first step when connecting an earthing cable to the OHE?

Connect the other end to earth first. Signup and view all the answers

What should be done after the temporary earths have been fixed on the OHE?

Proceed with the maintenance work. Signup and view all the answers

How often should the continuity of the cable connection be checked?

Once a fortnight Signup and view all the answers

What should be done if more than 20% of the strands in the earthing cable are broken?

Replace the cable immediately. Signup and view all the answers

What is a necessary precaution when working on OHE conductors that are not electrically bonded?

Earth both ends of the conductor separately. Signup and view all the answers

What should be inspected every month by TFO/ATFO?

The discharge/earthing pole assembly. Signup and view all the answers

Why should neutral sections be treated as live equipment during maintenance?

They may have different electrical potentials. Signup and view all the answers

What is the correct order for removing earthing rods after work completion?

Remove the hook first then the clamp attached to the rail. Signup and view all the answers

What action should be taken when accidents occur during slewing the OHE?

Provide the discharge/earthing pole assembly nearby. Signup and view all the answers

What is the minimum electrical clearance required from live OHE of the adjacent track?

2 m Signup and view all the answers

During the filling/loading and unloading of petroleum products, what action should be taken regarding the isolators at the neutral section of OHE?

They should be kept open. Signup and view all the answers

Who is responsible for submitting the Daily Report of OHE Maintenance?

Supervisor in-charge Signup and view all the answers

Which register should be maintained for reports regarding foot-patrolling?

Register for Foot-Patrol Reports Signup and view all the answers

What should the Register for Turnouts and Crossovers indicate?

Inspection dates and adjustments made. Signup and view all the answers

What type of measurements should the Register of Earth Resistance maintain?

Resistance measurements at grounding points. Signup and view all the answers

What is the purpose of the Register of Regulating Equipment?

Adjustments and conditions of regulating equipment. Signup and view all the answers

Which of the following is NOT included in the essential records for OHE maintenance?

Monthly inventory of parts. Signup and view all the answers

What is the role of the Linesman regarding the maintenance of OHE?

To enter reports in the foot-patrol register. Signup and view all the answers

What information is specifically recorded in the Register of Vulnerable Foundations?

Checks on foundations in susceptible areas. Signup and view all the answers

What should be done first before opening the isolator connected to the BT primary winding?

Switch off power from both elementary sections connected to the BT. Signup and view all the answers

After disconnecting the BT, what action is required for the return conductor?

It should be jumpered to make it through. Signup and view all the answers

Why should the return conductor be earthed after disconnecting the BT?

To ensure safety and minimize stray current risks. Signup and view all the answers

What should be done with the mid-point rail links on both sides of the BT?

They should be opened. Signup and view all the answers

What is a crucial precaution before performing maintenance under live OHE on petroleum sidings?

Ensuring no oil tanker is stable under live OHE. Signup and view all the answers

Which of the following is an important arrangement to avoid stray current risks on petroleum sidings?

Neutral zones in the track. Signup and view all the answers

What is required to ensure proper bonding in the vicinity of the track?

Copper rivets should be used for bonding. Signup and view all the answers

Which is a necessary precaution during fueling operations near the track?

Side filling arrangement must be used. Signup and view all the answers

Why is it important to replace a defective BT with minimal delay?

To reduce interference with adjacent communication circuits. Signup and view all the answers

Which action should NOT be taken when using isolators on the 25kV system?

Close isolators with current still flowing. Signup and view all the answers

What is the required size and type of the register to be maintained for a permanent record?

A-4 size, cloth-bound Signup and view all the answers

Who is responsible for ensuring that the registers are maintained accurately and up-to-date?

The Supervisor of the depot/sub-depot Signup and view all the answers

What specific record should be included in the Register of OHE Break-downs?

Details of the causes of breakdowns Signup and view all the answers

What condition must be met when TPC and the Section controller are located far apart?

Messages should be exchanged via phone and confirmed Signup and view all the answers

What type of data should the Register of Critical Implantations record annually?

Results of inspections at critical locations Signup and view all the answers

What is the maximum distance allowed between independent earths for a working party?

100 meters Signup and view all the answers

Which type of clamp should be used to connect the earthing pole assembly to the OHE conductor?

Top clamp Signup and view all the answers

What minimum cross-section should the earthing cable possess to withstand short circuit currents?

40 mm² Signup and view all the answers

Which step is necessary before commencing work on the OHE?

Get a permit-to-work Signup and view all the answers

When providing temporary earths, what should be done to the earthing clamp before connecting it to the OHE?

It should be checked for tightness Signup and view all the answers

In which location should the earthing clamp be secured in a single-rail-track-circuited section?

To the traction rail Signup and view all the answers

What is the recommended sequence for ensuring safety when providing temporary earths on OHE?

Obtain permits, warn workers, and then fix the earth Signup and view all the answers

What is the first step to ensure proper earthing when working on the OHE?

Fix the earthing clamp to the traction rail or mast first. Signup and view all the answers

Why is it necessary to earth each end of a snapped conductor separately?

To mitigate the risk of electric shock. Signup and view all the answers

What should be done if the cable used for earthing has more than 20% strands broken?

It should be renewed. Signup and view all the answers

When should the discharge/earthing pole assembly be inspected?

Once a month by TFO/ATFO. Signup and view all the answers

What is the correct procedure after maintenance work is completed?

Remove the earthing rods in reverse order of application. Signup and view all the answers

What should be done regarding neutral sections during maintenance work?

They must be treated as live and earthed at two points. Signup and view all the answers

What precaution should be taken during crane operations near the OHE?

The discharge/earthing pole should be kept away from interference. Signup and view all the answers

How often should the continuity of the earthing cable connection be checked?

Once a fortnight. Signup and view all the answers

What must be done with earthing when working near a sectioning point?

Both sections must be treated as live, requiring double earthing. Signup and view all the answers

What should be done to ensure safety before disconnecting the BT primary winding from the 25kV lines?

Switch off power from both elementary sections. Signup and view all the answers

What must happen to the return conductor after the BT is disconnected?

It should be earthed and made through by jumpering. Signup and view all the answers

Which of the following actions is NOT correct regarding the use of isolators on the 25kV system?

Isolators may be closed when current is flowing. Signup and view all the answers

What is a critical precaution when working on petroleum sidings in relation to live OHE?

No oil tanker must stable under live OHE. Signup and view all the answers

What is the importance of establishing neutral zones in the track of petroleum sidings?

To avoid the risk of propagating stray current. Signup and view all the answers

What should be done with mid-point rail links on either side of the BT during disconnection?

They must be opened to extend booster cells temporarily. Signup and view all the answers

What bond type should be used for bonding at petroleum sidings?

Copper rivets for effective bonding. Signup and view all the answers

What must be done at the insulated joint in the petroleum siding?

Connect 10 ohm earths on each side. Signup and view all the answers

How can interference in adjacent communication circuits be managed during BT disconnection?

By replacing the defective BT swiftly. Signup and view all the answers

What should personnel ensure regarding the arrangement of longitudinal and transverse bonds near petroleum sidings?

Bonds should be intact and at 30m intervals. Signup and view all the answers

What is the purpose of maintaining a Register of Clearance under over line structures?

To ensure minimum height requirements are met Signup and view all the answers

Which record is maintained to track adjustments made to Regulating Equipment?

Register of Regulating Equipment Signup and view all the answers

Which of the following statements accurately reflects the responsibility of the Supervisor in OHE maintenance?

They are responsible for completing the Daily Report of OHE Maintenance. Signup and view all the answers

When is it mandatory to keep isolators open in the neutral section of OHE?

During the filling/loading and unloading of petroleum products. Signup and view all the answers

What should the Register for Foot-Patrol Reports include?

Entries made by the Linesman regarding patrol findings Signup and view all the answers

Why is the Register of Current Collection Tests essential in OHE maintenance?

To analyze the performance of electrical connections Signup and view all the answers

What does the Register of Vulnerable Foundations detail?

Inspections on over bridges and embankments Signup and view all the answers

What type of data is recorded in the Register for Turnouts and Crossovers?

Dates and details of checks made on adjustments Signup and view all the answers

What type of reports is the Daily Report of OHE Maintenance required to include?

Details regarding the maintenance performed and issues found Signup and view all the answers

Study Notes

Safety Rules for OHE

General rules supplement the General and Subsidiary Rules and Volume I instructions.
Printed boards with electrical shock treatment instructions should be displayed in relevant OHE locations.
First Aid Boxes should be available at switching stations, maintenance depots, and other OHE locations.
Ropes, come-along clamps, and Trifor etc should be tested every six months.

Documents Required by OHE Supervisors

Supervisors must have complete structure erection drawings, layout plans, section diagrams, and general supply diagrams.
Supervisors need station working rules for all stations involved in the work.
Supervisors must have information about train running on the section.

Permits for Work on OHE

A permit is required before working on the dead OHE or within 2 meters of live OHE.
Permits should be obtained from the TPC or other authorized personnel.

Protection of Staff and Trains

Supervisory officials responsible for OHE work must observe relevant rules and safety provisions for train protection.
Measures for power blockage must be followed by all personnel to prevent accidental energisation.

Earthing Procedures Before Work on OHE

All metallic parts within reach must be earthed.
Each working party should be protected by two independent earthing points.

Temporary Earths Procedure

Personnel should warn of approaching trains.
Obtain permit-to-work before starting the work.
Only authorized cable assemblies for earthing can be used.
Cables should have adequate cross-section (40mm²).
Earth clamps must be secured to a mast at least one span away from the worksite.
Ensure the mast-to-earth rail bond is intact.
In single-rail-track-circuited sections, fix the clamp to the traction rail.
Double-rail-track-circuited sections should use mast clamps.
Ensure earthing clamps are tight before connecting to OHE.
Connect the mast/rail clamp to the OHE.
Repeat for the second temporary earth on the other side.

OHE and Conductor Precautions

The continuity of the cable connection from the top clamp to the earthing clamp should be checked every two weeks.
Broken cables should be replaced.
Discharge/Earthing assemblies should be inspected for function once a month by appropriate personnel.
In cases of accidents, suitable arrangements to safeguard discharge/earthing assemblies must be provided.
Ensure that two sections of conductors (disconnected from the earth), are earthed at multiple points on either side of the work zone.
When working on an isolator, both sides of the isolator should be earthed.

Protective Helmets and Safety Belts

Staff are required to wear helmets at all work sites.
Safety belts should be worn by staff working on structures or ladders to prevent falls.

Ladder Use

Ladders must be stored in a protected area.
Avoid placing ladders in a position where they can fall onto live parts.
Ladders should be tied down firmly for support.
Avoid placing ladders on live conductors.

Booster Transformer Isolation

When isolating a booster transformer, the BT primary winding must be disconnected and the OHE made through.
The secondary winding of the BT must also be disconnected and the return conductor made through.
The return conductors should be earthed at the disconnect location.

Petroleum Sidings

Equi-potential links should connect the petroleum siding to the track.
Neutral zones and longitudinal/transverse bonds are crucial for avoiding stray currents.
No oil tankers should be near live OHE for inspections.

Records & Registers

OHE maintenance supervisors should submit daily reports to relevant personnel.
Various registers are essential to track safety procedures and maintenance records for OHE, including issues like:
Foot patrols
Wire thickness measurements
Clearance inspection of overhead lines
Earth resistance readings
Current collection tests
Regulating equipment adjustments
Isolator inspections and maintenance
Vulnerable foundation checks
Feeder line patrols
Height gauges for level crossings
Splice inspections
OHE breakdowns

Forms for Power Block Messages (ETR-1, ETR-2, ETR-3, ETR-4)

Specific forms for reporting power block issues and requests, and for permit-to-work requests.
ETR-1 is for exchanging messages about temporary power blocks.
ETR-2 is for reporting shutdowns of electrical equipment/lines and related information.
ETR-3 is for permitting work in areas where power is off.
ETR-4 is for informing about short-term local blocks in power.

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Description

This quiz covers essential safety rules, required documents, work permits, and protective measures for Overhead Equipment (OHE) operations. It is aimed at supervisors and personnel involved in OHE management to ensure safety and compliance with regulations. Assess your understanding of these crucial procedures.