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Questions and Answers
Which of the following is a characteristic of a 'draw in system' for underground cable laying?
Which of the following is a characteristic of a 'draw in system' for underground cable laying?
- Conduits or ducts are laid with manholes to pull cables through. (correct)
- Cables are directly buried without any protective structure.
- Cables are encased in a solid insulating material before burial.
- Cables are supported on trays within a tunnel.
In a 'draw in system', what is the primary function of manholes?
In a 'draw in system', what is the primary function of manholes?
- To serve as connection points for cable branches only.
- To provide ventilation for the underground cables.
- To act as a grounding point for the cable shielding.
- To allow for pulling cables into ducts and providing access for maintenance. (correct)
What materials are commonly used for the conduit or duct in a 'draw in system'?
What materials are commonly used for the conduit or duct in a 'draw in system'?
- Aluminum and PVC
- Asbestos and rubber
- Wood and plastic only
- Glazed stone, cast iron, or concrete (correct)
Compared to direct burial, what is a key advantage of using a 'draw in system' for underground cable laying?
Compared to direct burial, what is a key advantage of using a 'draw in system' for underground cable laying?
A utility company is planning to install underground cables in a densely populated urban area. Which cable laying method would be most suitable if future access for repairs and upgrades is a high priority?
A utility company is planning to install underground cables in a densely populated urban area. Which cable laying method would be most suitable if future access for repairs and upgrades is a high priority?
In a 'draw in system,' what could be a potential issue if the manholes are spaced too far apart?
In a 'draw in system,' what could be a potential issue if the manholes are spaced too far apart?
Which of the following best describes the installation process of cables in a 'draw in system' after the conduit has been laid?
Which of the following best describes the installation process of cables in a 'draw in system' after the conduit has been laid?
What factor primarily determines the selection of the cable laying method?
What factor primarily determines the selection of the cable laying method?
How does the 'draw in system' contribute to the long-term reliability of an underground cable network?
How does the 'draw in system' contribute to the long-term reliability of an underground cable network?
What safety precaution is most critical when working within the manholes of a 'draw in system'?
What safety precaution is most critical when working within the manholes of a 'draw in system'?
In the 'draw in system', what is a primary consideration when determining the diameter and material of the conduits?
In the 'draw in system', what is a primary consideration when determining the diameter and material of the conduits?
Which factor is LEAST relevant when designing a 'draw in system' for underground cables?
Which factor is LEAST relevant when designing a 'draw in system' for underground cables?
In a scenario where an existing underground cable needs to be replaced using the 'draw in system', what initial step is crucial before pulling out the old cable?
In a scenario where an existing underground cable needs to be replaced using the 'draw in system', what initial step is crucial before pulling out the old cable?
The 'draw in system' primarily enhances which aspect of underground cable management?
The 'draw in system' primarily enhances which aspect of underground cable management?
What is a significant environmental consideration when installing a 'draw in system' in a protected natural area?
What is a significant environmental consideration when installing a 'draw in system' in a protected natural area?
In a 'draw in system', what is the purpose of cable lubricant?
In a 'draw in system', what is the purpose of cable lubricant?
A newly installed 'draw in system' experiences consistent water accumulation in its manholes. What is the most likely cause?
A newly installed 'draw in system' experiences consistent water accumulation in its manholes. What is the most likely cause?
If a 'draw in system' conduit becomes partially blocked, which of the following is the most appropriate first step to clear the blockage?
If a 'draw in system' conduit becomes partially blocked, which of the following is the most appropriate first step to clear the blockage?
How does the 'draw in system' compare to direct buried cable systems in terms of environmental impact during maintenance?
How does the 'draw in system' compare to direct buried cable systems in terms of environmental impact during maintenance?
A city planner is deciding between a 'draw in system' and a direct burial system for a new power distribution network. Which of the following factors would most strongly favor the selection of a 'draw in system'?
A city planner is deciding between a 'draw in system' and a direct burial system for a new power distribution network. Which of the following factors would most strongly favor the selection of a 'draw in system'?
Flashcards
Draw-in system
Draw-in system
An underground cable laying system where conduits or ducts are laid in the ground with manholes to pull cables through.
Direct laying
Direct laying
Underground cables are laid directly in the ground without additional protective structures.
Traying system
Traying system
A configuration where cables are supported on trays or racks.
Solid system
Solid system
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Study Notes
- In an underground cable laying system, conduits or ducts made of glazed stone, cast iron, or concrete are laid in the ground.
- Manholes are positioned at suitable locations along the cable route.
- Cables are pulled into position from these manholes after the conduit is set.
- The described system is the "Draw in system".
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