Outdoor Signalling Maintenance

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Questions and Answers

What is the purpose of inserting a 1.6 mm test piece during the adjustment of detector contacts?

To verify the functioning of the friction clutch

To ensure the detector contacts just make (correct)

To increase the distance between the rails

To facilitate the locking mechanism

What must be done before repeating the detector adjustment test when a lock slide is provided?

Adjust the driving rod

Ensure the machine is completely disassembled

Use a thicker test piece

Perform the test with fictitious locking (correct)

Which of the following indicates a need to check the IRS rotary type electric point machine during an obstruction test?

If the friction clutch does not slip

If it draws less than 1.5 times the normal operating current

If it draws less than 1.75 times the normal operating current (correct)

If it stops functioning altogether

During the obstruction test, which condition does NOT indicate proper functioning of the point machine?

The point detector contacts indicate closure Signup and view all the answers

What should be done after a connection has been soldered?

It should cool thoroughly before being disturbed. Signup and view all the answers

Which tool is inappropriate for stripping wire insulation?

Cutting pliers Signup and view all the answers

How many wires can be terminated on one terminal?

Two wires maximum Signup and view all the answers

Where should Colour Light Signals be positioned in relation to the track?

On the left-hand side of the relevant track Signup and view all the answers

What is the minimum height for the normal aspect of a Colour Light signal from rail level?

3.65 meters Signup and view all the answers

Which elements must be used while fastening wires?

Washers and check nuts Signup and view all the answers

What should be done regarding multi-strand wires?

They should be terminated on terminal lugs and insulated. Signup and view all the answers

Which committee is responsible for deciding the exact location of new or shifted signals?

Signal Sighting Committee Signup and view all the answers

What must be done if a signal needs to be placed on the right-hand side due to site constraints?

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

What should be done with a new signal that is not yet operational?

It should have an 'X' marked across it. Signup and view all the answers

Who is responsible for checking the visibility of existing signals?

Jointly by SSE, traffic inspector, and loco inspector. Signup and view all the answers

What should be indicated by red color on a signal post?

Infringing distance when dimensions are below schedule. Signup and view all the answers

How should Colour Light Signals be mounted?

On a rigid ground post or a signal gantry. Signup and view all the answers

What is required for the cable entry at the signal unit?

A wooden plug should be used to close excess gap. Signup and view all the answers

What color background is required for enameled signal number plates for non-Gate stop signals?

White. Signup and view all the answers

What action must be taken to improve the visibility of signals if required?

A time-bound action based on committee recommendations must be taken. Signup and view all the answers

What is the purpose of locking the crank handles in point machines?

To prevent unauthorized use of the crank handles Signup and view all the answers

How can the crank handle be released for use?

By releasing a control from the control panel Signup and view all the answers

What measures are taken to prevent water ingress in electric point machines?

All openings are sealed and gaskets are used Signup and view all the answers

What should be done with worn-out slides in point machines?

They must be replaced with new ones Signup and view all the answers

How is the adjustment of driving rods initially performed?

By manually hand cranking the machine Signup and view all the answers

What is the adjustment range for the locking dog in the point machine?

2 mm to 3.5 mm Signup and view all the answers

What effect does inserting the hand crank into the machine have on the power supply?

It disconnects the power supply to the machine Signup and view all the answers

Why must the excess gap around the cable entry to the machine be plugged?

To prevent the entry of rodents and water Signup and view all the answers

Which of the following must be ensured before installing the machine?

The machine should rotate freely without any hindrances. Signup and view all the answers

What is the purpose of the crank handles mentioned in the content?

To operate points in case of failure of point machines. Signup and view all the answers

Where should the wiring from the point of operation to the location box be placed?

In cable to minimize voltage drop. Signup and view all the answers

Which statement regarding the installation of point machines is incorrect?

The crank handles do not require any distinctive markings. Signup and view all the answers

What should be done if there is an obstruction to the point movement?

Cut off the motor feed after a predetermined time lag. Signup and view all the answers

Which of the following is NOT a provision that must be made before machine installation?

Testing the machine for speed capabilities. Signup and view all the answers

What is the significance of connecting detection of points at both ends of a crossover in series?

It ensures proper setting and locking of points. Signup and view all the answers

What must be done to the cable used for connections to ensure safety?

It must be tested for insulation and continuity. Signup and view all the answers

What should occur to the point when a 5 mm thick test piece obstruction is placed between the switch and the stock rail?

The friction clutch should slip Signup and view all the answers

What is a potential cause of excessive current indicating a problem with the point machine?

Accumulation of dirt or dust Signup and view all the answers

What is essential to check regarding the spring in each switch?

It should not cause excessive wear on machine parts Signup and view all the answers

What should technicians monitor periodically at the motor terminals to ensure proper operation?

Voltage and current levels Signup and view all the answers

Which of the following is NOT part of the maintenance check for point machines?

Adjusting the point drive rod for aesthetics Signup and view all the answers

What happens to the feed to the point during an obstruction?

It is automatically disconnected Signup and view all the answers

Why is it necessary to check if the current required to operate the machine is unbalanced?

It could signal an issue with the machine's lubrication Signup and view all the answers

What should be done if badly worn-out pins are found during inspection?

Replace them and ream out the holes for oversized pins Signup and view all the answers

Study Notes

Outdoor Signalling - Installation, Testing and Maintenance of Equipment

General Instructions on Tools:
- All staff involved in installation and maintenance of signalling equipment need appropriate rubber gloves and tools (e.g., pliers, screwdrivers).
- Insulated tools are essential to prevent short circuits when working near electrical equipment.
- A list of required tools should be circulated by the relevant authority.
- Rubber floor mats should be used for circuits carrying more than 110V.
Soldering Care:
- Staff involved in signalling equipment maintenance should know how to solder.
- Avoid dropping solder and wire clippings on adjacent terminals or equipment.
- Appropriate wattage soldering irons (65-125W) are needed.
- Tools such as a file for preparing the soldering tip, a fireproof pad for cleaning the tip and a mica sheet for support are essential.
- Avoid excessive solder use to prevent lumpy connections.
- Do not hold the soldering iron on a wire connection for too long to prevent insulation damage.
Wire Termination:
- Use wire strippers to remove insulation, not cutting pliers.
- Use washers and nuts when fastening.
- Terminate a maximum of two wires per terminal.
- Crimp tools should be used for proper connection of multi-strand wires, and insulated sleeves are necessary.
- Proper soldering is required when lugs are crimped.
Colour Light Signals Installation:
- Signals should be multi-unit (approved type) with LED lamps.
- Signals should be positioned in accordance with approved plans and guidelines.
- They should be located to provide a clear view to the driver of an approaching train.
- Signal height should be at least 3.65 meters above rail level.
- Signals should be turned away from the track during non-operational periods.
- Implement proper visibility checks and maintenance.
Mounting and Fixtures:
- Signals can be mounted on rigid posts or gantries.
- Clear identification markers (e.g., 'G', 'P', 'A') should be used.
- Signal posts must be firmly secured.
- Wooden plugs should be used to prevent cable entry gaps.
- Retro-reflective number plates are necessary for visibility.
- Signal ladders should be firmly fixed to the posts.
Cable Entry:
- Cables should be properly protected at entry points.
- Protect cables from rodents and harsh weather.
- Use appropriate cable sizes.
LED Aspects:
- Use LED aspects with built-in current regulators for better visibility.
- Different colours (red, yellow, green) are used for different signal meanings.
Gaskets and Sealing:
- Seal all openings on equipment cases to prevent water, dust and vermin entry.
Electric Point Machine Installation:
- Use approved electric point machines according to plans.
- Ground connections must be properly checked.
- Install machines clear of track obstacles.
- Machines should be cleaned, lubricated and aligned before operation.
- Ensure proper alignment and level of connections.
- Check the machine for proper functioning and safety.
Adjustment of Driving Rod:
- Points should be adjusted by hand cranking the machine.
- Ensure the power supply is disconnected during hand cranking.
- Adjust the connections to properly fit the stock rail.
- Repeat the process for other switch placements.
Adjustment of Detector Contacts:
- Insert a test piece between stock rail and switch rail.
- Adjust the detector connections to make contact.
- Tighten any relevant nuts.
Adjustment of Friction Clutch:
- Check the operating current of IRS rotary type machines if it's less than 1.75 times the normal level.
- Check the machine for proper operation if obstruction test results are below 1.75 times normal operating current.
- Check for proper point placement, detector response, and friction clutch function.
Testing of Point Machine:
- Conduct obstruction tests to ensure the switch can't be engaged when obstructed.
- Check the current required to operate the machine in both directions for balance to prevent friction during operation.
- Perform regular tests to maintain good condition.

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Description

This quiz covers the essential guidelines for the installation, testing, and maintenance of outdoor signalling equipment. Participants will learn about the tools required, soldering techniques, and safety precautions to ensure effective and safe operations. Perfect for staff involved in signalling equipment management.