Podcast
Questions and Answers
What is the recommended method for laying OFC, according to the provided guidelines?
What is the recommended method for laying OFC, according to the provided guidelines?
- Suspending the OFC cable between masts.
- Laying the OFC cable in steel troughs.
- Laying the OFC cable in HDPE pipe using the blowing method. (correct)
- Directly burying the OFC cable in the ground.
What should be the minimum depth of a cable pit near the OFC room?
What should be the minimum depth of a cable pit near the OFC room?
- 1.25m (correct)
- 1.50m
- 1.00m
- 0.75m
In yard, what minimum distance from ONE masts should be maintained with HDPE Pipe?
In yard, what minimum distance from ONE masts should be maintained with HDPE Pipe?
- 4.75 Mtr
- 3.75 Mtr
- 0.75 Mtr
- 1 Mtr (correct)
What contour allowance should be added with the route length as per actual measurement for OFC cable length calculation?
What contour allowance should be added with the route length as per actual measurement for OFC cable length calculation?
When laying OFC, at every joint, how much loop of cable should be kept on either side?
When laying OFC, at every joint, how much loop of cable should be kept on either side?
After trenching, at what depth from the surface should PVC warning tape be provided continuously in the trench?
After trenching, at what depth from the surface should PVC warning tape be provided continuously in the trench?
During pulling, what is the maximum pulling speed recommended for laying of cable by winch?
During pulling, what is the maximum pulling speed recommended for laying of cable by winch?
What is the minimum depth to be ensured in trenchless method for Road/ Railways track etc?
What is the minimum depth to be ensured in trenchless method for Road/ Railways track etc?
If the diameter of OFC is 'D', what is the minimum bend radius during pulling under tension?
If the diameter of OFC is 'D', what is the minimum bend radius during pulling under tension?
What is the recommended maximum temperature for pouring bitumen compound when filling steel troughs to prevent theft of optic fibre cables?
What is the recommended maximum temperature for pouring bitumen compound when filling steel troughs to prevent theft of optic fibre cables?
What is the purpose of performing a Duct Integrity Test (DIT) before OFC cable blowing?
What is the purpose of performing a Duct Integrity Test (DIT) before OFC cable blowing?
What is the maximum permissible pressure drop during the pressure test component of a Duct Integrity Test (DIT)?
What is the maximum permissible pressure drop during the pressure test component of a Duct Integrity Test (DIT)?
What painting color should be on All sides above ground of RCC Cable Route Marker for QUAD joints?
What painting color should be on All sides above ground of RCC Cable Route Marker for QUAD joints?
During splicing of fibre, how much length of primary protective coating of each fibre shall be stripped off by fibre stripper?
During splicing of fibre, how much length of primary protective coating of each fibre shall be stripped off by fibre stripper?
In the context of OFC laying across girder bridges, which method is recommended for girder bridges with a span length of more than 12 meters?
In the context of OFC laying across girder bridges, which method is recommended for girder bridges with a span length of more than 12 meters?
What is the primary reason for limiting the length of signaling line circuits?
What is the primary reason for limiting the length of signaling line circuits?
Considering a scenario where a D1 circuit utilizes unscreened cable and operates line relays, what is the significance of 'immunity' in this context?
Considering a scenario where a D1 circuit utilizes unscreened cable and operates line relays, what is the significance of 'immunity' in this context?
For a 110V feed system utilizing unscreened cable, what is a key difference in signal feeding distance between single and doubled track scenarios?
For a 110V feed system utilizing unscreened cable, what is a key difference in signal feeding distance between single and doubled track scenarios?
What purpose does painting a cable with red color serve, especially in areas with high induced voltage?
What purpose does painting a cable with red color serve, especially in areas with high induced voltage?
What is the significance of maintaining a safety factor when determining the maximum permissible induced voltage?
What is the significance of maintaining a safety factor when determining the maximum permissible induced voltage?
When insulated rod joints are used in RE (Rail Electrification) projects, what dictates the need for additional insulators besides the standard ones at each end?
When insulated rod joints are used in RE (Rail Electrification) projects, what dictates the need for additional insulators besides the standard ones at each end?
When a signal post fitting is installed near a line conductor, what critical safety measure must be observed?
When a signal post fitting is installed near a line conductor, what critical safety measure must be observed?
When installing point rods that cross the track, which aspect is crucial regarding the distance between the top of the rod and the bottom of the rail?
When installing point rods that cross the track, which aspect is crucial regarding the distance between the top of the rod and the bottom of the rail?
What is the acceptable height above rail level for the center line of a red signal unit for signals without junction indicators outside tracks?
What is the acceptable height above rail level for the center line of a red signal unit for signals without junction indicators outside tracks?
Why should relays which release interlocking have a time delay?
Why should relays which release interlocking have a time delay?
What is the normal height of the catenary wire?
What is the normal height of the catenary wire?
In electrified zones, what type of signaling circuits are generally not allowed?
In electrified zones, what type of signaling circuits are generally not allowed?
If a signal post is located near a traction mast, what is the minimum distance that should be maintained between the signal post and the traction mast?
If a signal post is located near a traction mast, what is the minimum distance that should be maintained between the signal post and the traction mast?
What should be done if any part of signalling staff or tools falls within 2 meters of a live conductor?
What should be done if any part of signalling staff or tools falls within 2 meters of a live conductor?
If adequate visibility is not present at any stage, what action should the official take?
If adequate visibility is not present at any stage, what action should the official take?
What factors contribute to the induced voltage in cables near electrified tracks?
What factors contribute to the induced voltage in cables near electrified tracks?
On tangent tracks, where should the signal ideally be located in relation to the OHE (Overhead Equipment) structure?
On tangent tracks, where should the signal ideally be located in relation to the OHE (Overhead Equipment) structure?
What specific type of short neutral section is preferred on level track after a stop signal?
What specific type of short neutral section is preferred on level track after a stop signal?
For outdoor signaling circuits in RE (Railway Electrification) areas, what is a critical factor to consider regarding parallelism?
For outdoor signaling circuits in RE (Railway Electrification) areas, what is a critical factor to consider regarding parallelism?
What action should be performed on black wires during erection?
What action should be performed on black wires during erection?
What is the purpose of providing a protective wire mesh screen in the context of 25kV electrified areas?
What is the purpose of providing a protective wire mesh screen in the context of 25kV electrified areas?
In tunnel bridges, what specifically is the height of Contact wire?
In tunnel bridges, what specifically is the height of Contact wire?
What type of relay is disallowed inside for internal circuits?
What type of relay is disallowed inside for internal circuits?
Flashcards
OFC Laying Method
OFC Laying Method
Laying OFC in HDPE pipes via blowing method.
IP MPLS Network
IP MPLS Network
Installed for both short and long distances.
Wettable Away Slope
Wettable Away Slope
Ensures smoother cable entry into the pit.
OFC Cable Length
OFC Cable Length
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OFC Bend Radius
OFC Bend Radius
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Radius of Drum
Radius of Drum
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Pulling Speed
Pulling Speed
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Cable Depth at Culverts
Cable Depth at Culverts
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Steel Troughs with OFC
Steel Troughs with OFC
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Bricks in Cable Trench
Bricks in Cable Trench
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Cable Markers
Cable Markers
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Minimum Depth at Track Crossing
Minimum Depth at Track Crossing
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Mechanical Splice
Mechanical Splice
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Fusion Splicing
Fusion Splicing
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Duct Integrity Test (DIT)
Duct Integrity Test (DIT)
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Signalling Line Circuit Length
Signalling Line Circuit Length
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SL Induced Voltage (Unscreened)
SL Induced Voltage (Unscreened)
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D2 Induced Voltage (Unscreened)
D2 Induced Voltage (Unscreened)
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Relay Immunity
Relay Immunity
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Safety Factor
Safety Factor
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Signal Feeding Distance (Double)
Signal Feeding Distance (Double)
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Signal Feeding Distance (Single)
Signal Feeding Distance (Single)
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Insulated Rod Joints for RE
Insulated Rod Joints for RE
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OHE Impact on Signals
OHE Impact on Signals
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RE Area Layout Plan
RE Area Layout Plan
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Protective Wire Mesh Screen
Protective Wire Mesh Screen
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Induced Voltage Factors
Induced Voltage Factors
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Normal Contact Wire Height
Normal Contact Wire Height
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Normal Catenary Wire Height
Normal Catenary Wire Height
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Contact Wire Height in Tunnels
Contact Wire Height in Tunnels
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Signal Safety near 25kV
Signal Safety near 25kV
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Neutral Section Location (after)
Neutral Section Location (after)
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Neutral Section Location (before)
Neutral Section Location (before)
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Signal Erection Approval
Signal Erection Approval
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Min Distance between Signal Post / Traction mast
Min Distance between Signal Post / Traction mast
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Signal Location Desirability
Signal Location Desirability
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Red Signal Unit Height
Red Signal Unit Height
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Max Signal Height (No Route Indicator)
Max Signal Height (No Route Indicator)
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Study Notes
Optical Fiber Communication System: Guidelines and Procedures
Section IX: Cable Protection
Cable Crossing
- Utilize RCC/DWC ducts, ensuring a consistent depth akin to standard routes.
- When traversing LC gates, position RCC/DWC ducts on the roadway, extending 2 meters minimum from each side.
- Maintain a minimum depth of 1.2 meters when crossing tracks, should not be tess than 1.2meters when crossing the tracks
Cable Deployment in Rocky Terrains
- Use GI pipes in for cable deployment in rocky areas and Cable should kepted at the ends.
Trench Backfilling
- A PVC warning tape at the trenching will be inspected
- Ensure PVC at a ammounting length.
Fiber Cleaning
- Use Fiber Stripper
- All equipment shall be good quality
Installation Information
- Use Fusion splicing should be for installation
Failure of DIT: common reasons:
- Verify cable if passed the DIT.
- If not, please verify test setup
- poor jointing and sleeving
- puncture with installation.
DIT Test Steps
- Each step need to be verified, with data to ensure good test.
- All connectors need to be properly connected
Cable Pushing Test
- Conduct sponge test with parameters
- Inspect test with inspection procedure
Quality Control
Route Marking
- Paint all ground as per government requirements or any local
- All should be verified that are properly with safety
Pressure Test parameters:
- Conduct test for 30 minutes
- Inspect joints for leakage
- Should maintain pressure not dropping during the time
Duct Integrity Test (DIT)
- Test DIT with multiple equipments to ensure to specification
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Description
Explore guidelines for optimal OFC laying, including recommended methods, depths, clearances, and precautions. Learn about cable pit depth, HDPE pipe distance from masts, contour allowance, loop length at joints, PVC warning tape placement, pulling speed, trenchless method depth and other important considerations.
