Electrical Testing and Inspection Procedures

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What must be checked to ensure proper connection of light arrestors?

They are properly connected and earthed as per plan. (correct)

They are counted and logged in the wiring diagrams.

They are marked for easy identification.

They are properly connected to the terminal boards.

Which test must be conducted prior to continuity and insulation testing of wires?

Voltage drop test.

Color code verification.

Contact occupancy test. (correct)

Wire gauge test.

What is recommended when dealing with wiring alterations?

Verify changes solely through verbal confirmation.

Always use the same color code for all changes.

Conduct changes without updating drawings.

Implement a clear system for deletions and additions. (correct)

What does point to point testing verify in the wiring process?

Compliance with the approved wiring diagram. Signup and view all the answers

How should individual circuits be checked?

By ensuring proper connectivity to each relay. Signup and view all the answers

What action should be taken if extraneous feed or relay operation issues are observed?

Investigate thoroughly and take corrective action Signup and view all the answers

What is the significance of conducting a wire count test?

To verify the number of wires corresponds with contacts. Signup and view all the answers

What is the purpose of conducting a simulation test after completing indoor wiring?

To ensure correctness of indoor wiring before connecting to outdoor gears Signup and view all the answers

What must be done if a device is controlled through multiple parallel paths?

All paths must be checked separately. Signup and view all the answers

What is required for terminals and binding posts in the wiring inspection?

All connections must be properly secured. Signup and view all the answers

Which of the following is NOT mentioned as a part of the installation and testing specification?

Public Announcement Systems Signup and view all the answers

What is the maximum interval for System Integrity Testing (SIT)?

Once every five years Signup and view all the answers

What should be provided between yard locations for maintenance communication in non-RE areas?

At least two cores of cable Signup and view all the answers

Which chapter covers the power supply arrangements for signalling installations?

Chapter 16 Signup and view all the answers

In a large yard, grouped location boxes may connect to the cabin using what?

Separate pairs of conductors for each direction Signup and view all the answers

What is the main focus of System Integrity Testing (SIT)?

To ensure safety and functional working of both indoor and outdoor signaling equipment Signup and view all the answers

What should be regularly checked and tested according to the guidelines?

Power supplies and battery chargers Signup and view all the answers

What is a necessary precaution during testing of signals?

Ensure no signal taken 'OFF' conflicts with a train Signup and view all the answers

Which of the following arrangements should be tested for effectiveness?

Cascading signals on the route Signup and view all the answers

What type of data should staff receive from data loggers?

Exception reports Signup and view all the answers

What precaution is necessary regarding voltage levels applied to signaling equipment?

Voltage levels must not exceed permissible limits Signup and view all the answers

How should polycarbonate lenses of LED lamps be maintained?

Wiped with a dry soft cloth Signup and view all the answers

What type of protection arrangements should be tested regularly?

Surge protection devices and earthing Signup and view all the answers

Which condition must not occur for a route set for a train movement?

Points and isolation must be disturbed Signup and view all the answers

What should happen after the point knob 2 is turned from reverse to normal?

The point should remain locked. Signup and view all the answers

What is the expected behavior when shunting the approach track A2WT?

The signal should assume an ON position. Signup and view all the answers

What should you do if you try to alter the route after normalizing the signal switch/button?

The route should be free. Signup and view all the answers

What is the main purpose of conducting back locking procedures?

To hold the signal until the route is released. Signup and view all the answers

When track circuits are provided with redundancy, what is critical to test?

The redundancy and effectiveness in signalling circuits. Signup and view all the answers

What should happen when the relay for Level Crossing Gate control is de-energized?

The signal should go to an ON position. Signup and view all the answers

After clearing the signal route 2WBI and shunting track 2WT, what should occur?

The signal should go to ON. Signup and view all the answers

What is the expected result of normalizing the route after shunting?

The signal should revert to displaying an OFF aspect. Signup and view all the answers

What must happen before a signal can be changed once it is cleared for a particular route?

None of the points in the route can be changed when the track circuit is de-energised. Signup and view all the answers

In case of sectional route release, what is required for a sub-route to be released?

The next track circuit must also drop and pick up. Signup and view all the answers

What ensures that a route remains locked when no sectional route release is provided?

The entire route remains locked when any track circuits beyond the signal are de-energised. Signup and view all the answers

What is required for a time release to alter a route after a signal is returned to 'ON'?

The prescribed time interval must have lapsed. Signup and view all the answers

What must be checked to ensure the indication of 'ON' position of all signals is correct?

It must correspond with the aspect displayed at the site. Signup and view all the answers

For signal indication circuits, what must be ensured about the indication relay?

It must not energize until the required lamps/LEDs are lit. Signup and view all the answers

What happens when the route is controlled by a single track circuit regarding release?

The route is released after a prescribed time delay. Signup and view all the answers

After the last track circuit is cleared, what condition is necessary for the overlap to be released?

The concerned signal knob/button must be normalized. Signup and view all the answers

What should happen after a point is fully reversed and each track circuit is individually shunted?

It should not be possible to operate the point Signup and view all the answers

What action is required when an obstruction is present in the points?

The overload relay should energize and cut off motor feed Signup and view all the answers

What is the expected behavior of the point indication relay when the point is operated with an obstruction?

It should de-energize and extinguish both indications Signup and view all the answers

What test needs to be conducted to check for out of correspondence in the point controlling circuits?

Open the cut out contact of one end of the point machine Signup and view all the answers

How should the detection relay behave when the point is operated and an obstruction is detected?

It should de-energize and indicate both positions Signup and view all the answers

What indicates a proper interlocking operation with a crank handle?

Signals cannot be taken 'OFF' nor the points operated Signup and view all the answers

When conducting tests on the point machine, what is checked when operating it from normal to reverse?

The engagement of the overload cutoff Signup and view all the answers

What should be verified about the point indication in the cabin after operating the points?

It should correspond with the actual point positions Signup and view all the answers

Study Notes

Test Procedure

Systematic methods, like marking on control tables and diagrams, ensure all circuits are checked thoroughly.
Standardized forms should be created to record electrical equipment tests, guaranteeing availability of records and analysis.

Testing Instruments

Suitable instruments, such as multimeters, voltmeters, ammeters, ohmmeters, frequency meters, and cable fault locators, are used for testing electrical signalling circuits.
Calibration of these instruments must be verified periodically.

Physical Inspection of the Installation

The work must adhere to approved plans and utilize equipment of the correct type and in good working condition.
Check signals, location boxes, outdoor equipment, ventilation arrangements, and the condition of the equipment for proper functioning.
Ensure all required equipment and accessories (batteries, fuses, etc) are installed as per specifications and that necessary apparatus is utilized.
Verify the correct location of insulation joints, jumper wiring, and traction bonding, and that all apparatus is in a satisfactory condition.
Check for proper electrolyte levels, interconnections between cells, and cell voltages in accordance with relevant specifications.
Every wire must be tagged with a corresponding nomenclature to ensure clear identification and in line with the diagram. Insulating tags or sleeves should be used.
Verify wire counts against wiring diagrams, paying close attention to terminated wires, terminals, and relay boards.
Ensure proper grounding and connections for all components mentioned in the plan.

Checking of the Wiring

Conduct point-to-point testing to verify the wiring adheres to the approved diagram.
Test each wire for continuity and insulation before plugging in the relays.
Count the wires on each contact confirming with the contact analysis.
A colour/tick system for tracking changes in wiring should be used. Deletion/modification should be noted in a clear way.

Test of Individual Circuits

Each circuit must be verified to ensure it's controlled correctly by its relevant contacts.
Conduct testing on multiple paths feeding a single device.
Investigate and correct faults, addressing intermittent or continuous extraneous feed issues or relay problems.
Thorough indoor wiring tests and simulation of field gears are critical before connecting outdoor gears.

Installation, Testing of other equipments & Cables

Conduct installation and testing of all equipment according to specifications and relevant chapters in the SEM manual.
Track circuits, AFTC, axle counters, LC gates, and signaling cables must comply with specified procedures.
Laying and testing of signaling cables must be done in strict accordance with defined standards.
Where possible, telephones or similar communication systems should be incorporated to aid in coordinated action.

System Integrity Testing (SIT)

Thorough testing of all indoor and outdoor signal equipment is required to ensure proper system functionality and safety on new or modified installations or once every five years in existing systems.

Testing Procedure for Panel Interlocking/Route Relay Interlocking Installations

Ensure the interlocking system complies with approved plans and drawings.
Follow specific testing procedures for route relay interlocking installations, referencing station layouts, for testing.

Testing of Relay Interlocking

Verify point locking, operation, and locking during testing.
Ensure safe operation of circuits and preventing conflicting movement is in place.
Check for correct signal indications and compliance with approved diagrams.

Testing of Signals

Verify the proper functionality of each signal, using testing procedures, ensuring proper indications, and complying with related diagrams.
Test and verify signaling circuit components and related tracking circuits, ensuring correct operation in all scenarios.

Point Controlling Circuits

Check the correct operation of points using their specific controls.
Test operation of associated components to verify their correct functioning and ensure the absence of issues with the circuits.

Miscellaneous Circuits

Verify various arrangements impacting signal efficiency, and safety.
Check protection mechanisms for safety and ensure appropriate functionality of all associated mechanisms.
Test the appropriate functioning of the relay contacts.

Precautions during Testing

Avoid inadvertently changing signals or creating unsafe movement conditions during testing procedures.
Ensure the avoidance of any point/isolation issues or conflicts that could lead to hazardous situations.
Safety procedures should be consistently applied throughout the testing process.

Maintenance of Colour Light Signals

Maintain cleanliness of LED lenses.
Replace defective LED lamps.
Ensure that the lamps adhere to prescribed life spans in their specified usage environments.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

This quiz assesses your understanding of systematic testing procedures for electrical installations. It covers the use of testing instruments, the importance of physical inspections, and adherence to approved plans and specifications. Test your knowledge on ensuring the reliability and safety of electrical circuits.