What is the distance between the two work stations installed on the thick cable when the thick cable

Cable reserved length.

Table: 1Cable laying slack, waveform curvature, cross reserved length is calculated according to the full length of the cable.

2.Cable into the building, 2 meters The minimum value specified in the code.

3.When the cable enters the trench or hanger, it leads up to the minimum value specified in the specification.

4.The minimum value specified in the substation incoming and outgoing meters specification specifies the minimum value.

5.Power cable termination head m Minimum maintenance allowance.

6.Cable entry control protection screen height + width according to the size of the disk.

7.High-voltage switchgear low-voltage switchboard, box 2 meters under the panel inlet and outlet lines.

8.The cable to the motor meter is counted from the motor junction box.

9.Factory transformer 3 meters from the floor.

10.The length of the cable lintel column, etc. is calculated according to the actual calculation.

11.Elevator cable and cable rack fixing points per meter Specification minimum.

There is no requirement for cable laying in the middle, and the natural sag of the cable can be maintained when laying, and if the bridge is laid, the retainer has room for expansion and contraction in the bridge. Generally, it is stipulated that 10m is reserved at both ends, but the construction site time proves that it is best to reserve 15m.

Leave 3-5 meters between the two ends and the equipment. Rice in the middle. That's it.

Answer]: B2021 textbook p422

Knowledge points: communication line system. The length of the first machine such as the traction of the rubber brigade is generally not more than 1000m, and the auxiliary traction should be added in the middle when the conditions permit the stool.

Answer]: A This question examines the technical requirements for the construction of power supply trunks and indoor distribution lines. When the design does not require a key reputation, the clear mold between the layers of the cable bracket should not be less than 2 times the outer diameter of the cable plus 10mm, and the 35kV cable should not be less than 2 times the outer diameter of the electric cable plus 50mm.

Answer: C

This question examines the installation of electrical wiring stoves. When multiple cables are installed in the same trench and the trench is set up, the parallel distance of the cable below 10kV is 170mm, and the parallel distance of the cable above 10kv is 350mm.

Summary. The commonly used cable laying methods in the equipment room are:1

Straight-through laying: Pulls the cable directly to the destination, which is suitable for short distances and small number of devices. 2.

Annular laying: The cable is formed into a ring, which is convenient for multiple devices to be connected at the same time, and is suitable for a large number of devices. 3.

Star Laying: Cables are routed from a central point to individual devices, which is suitable for situations where a wide range of equipment is distributed and each device needs to be controlled individually. 4.

Tree laying: Cables are laid from a central point to each branch device, which is suitable for a large number of devices and needs to be controlled in layers. 5.

Mixed laying: To combine the above laying methods, you need to consider comprehensively according to the actual situation.

The commonly used cable laying methods in the equipment room are:1Straight-through laying:

Pull the cable directly to the destination for short distances and small number of devices. 2.Annular laying:

The cable forms a ring to facilitate the simultaneous access of multiple devices, which is suitable for a large number of devices. 3.Star laying:

Cables are routed from a central point to individual devices for situations where a wide range of devices are distributed and each device needs to be controlled individually. 4.Tree laying:

Cables are routed from a central point to each branch device, which is suitable for situations where the number of devices is large and hierarchical control is required. 5.Mixed laying:

To combine the above laying methods, you need to consider comprehensively according to the actual situation.

What is the scope of the design of the subsystem of the building complex?

The design scope of the building complex subsystem usually includes the following aspects:1Structural design of the building:

This includes the overall structural design of the building and the selection of various structural forms. 2.Electromechanical water system design:

Including lighting and power systems, heating, ventilation and air conditioning systems, water supply and drainage systems, fire protection systems, etc. 3.Security and anti-theft system design:

Including intelligent building automation control system, intelligent lighting system, intelligent security system, etc. 5.Environmental protection system design:

Including solutions to environmental protection problems such as wastewater, exhaust gas, and noise. 6.Green Building Design:

The design of the subsystem of the building complex should meet the requirements of low energy consumption and carbon emission as much as possible to reduce the impact on the environment. 7.Selection of building materials:

Considering the safety, aesthetics, durability and other aspects of the building, select suitable building materials and components. 8.Building construction plan:

The design of the subsystem of the building complex should be closely coordinated with the building construction plan to ensure that the project is completed on time and with quality.

The commonly used cable laying methods in the equipment room are as follows:1Direct laying:

Cables are laid directly on the ground or wall, making them suitable for connections over short distances. 2.Pipe laying:

Placing the cable in the pipe and then burying the pipe in the ground or inside the wall is suitable for long-distance connections. 3.Laying of bridges:

Place the cable on the tray and mount the tray on the wall or ceiling, which is suitable for situations where the cable needs to be replaced frequently. 4.Suspension laying:

Suspend the cable on a boom or hanging wire for situations where the cable needs to be replaced frequently. 5.Underground laying:

The cable is buried in the ground, which is suitable for applications where the cable needs to be protected from the external environment. 6.Tunneling:

Placing the cable in the tunnel is suitable for applications where it is necessary to protect the cable from the external environment. When choosing the laying method, it is necessary to consider the length of the cable, environmental conditions, safety and other factors to choose the most suitable laying method.