The installation and construction steps of the strong and weak electricity distribution system project are as follows:

preliminary work for construction

-Be familiar with the construction drawings, including system drawings and floor plans, and make clear the position, specifications, direction and other information of each part.

-Prepare construction materials and equipment, such as wires, cables, distribution boxes, power distribution cabinets, etc. The materials shall meet the design requirements and quality standards. At the same time, check whether the tools are complete and can be used normally.

-Organize construction personnel, make technical disclosure, and let them know about the construction process and quality requirements.

Reserved and embedded

-According to the construction drawings, the pipeline, box and hole shall be reserved and embedded in the construction stage of the building structure. For high-voltage systems, such as embedding wires and conduits in concrete walls, it is necessary to ensure that the bending radius of the pipeline conforms to the specifications and avoid dead bending affecting threading.

-For weak current systems, such as the conduit reservation of integrated wiring system, the distance from other systems should be considered to prevent signal interference.

Bridge installation

-When installing the bridge, first determine its installation position and direction. When the bridge is installed horizontally, the bracket spacing is generally not more than 1.5-3m；; When installed vertically, the bracket spacing shall not be more than 2m.

-Bridge joints shall be grounded by jumper to ensure electrical connectivity, and the grounding resistance shall meet the requirements of specifications, generally not greater than 1Ω.

Pipe laying

-Line pipes shall be laid neatly and fixed firmly. For conduit buried underground or in concrete, the thickness of protective layer shall not be less than 15mm.

-Strong and weak wires and conduits should be laid separately, generally with a spacing of more than 300mm to reduce electromagnetic interference. When intersection is inevitable, isolation measures should be taken.

cable laying

-Before laying, check whether the model and specification of the cable meet the requirements. When laying cables, it is necessary to avoid excessive dragging and twisting of cables.

-For long cables, mechanical traction can be used, and a certain length should be reserved at the cable terminal and joint to facilitate the subsequent wiring work. High-voltage cables and weak-current cables should also be laid separately.

Installation of distribution box and distribution cabinet

-The installation positions of distribution boxes and cabinets should be correct, and the installation height should meet the design requirements. Its verticality deviation should not be greater than 1.5‰.

-The electrical components in the cabinet should be installed firmly and connected correctly. For floor-standing distribution cabinets, foundation channel steel should be set at the bottom, and the levelness deviation of channel steel should not be greater than 1‰.

Equipment wiring

-Check the types and uses of wires and cables again before wiring. Attention should be paid to the distinction between phase sequence and color in the wiring of high voltage system. Generally, phase A is yellow, phase B is green, phase C is red, zero line is light blue, and protective ground wire is yellow and green.

-wiring of weak current system shall be carried out in strict accordance with the equipment wiring diagram to ensure firm line connection and good contact.

system test

-Insulation resistance test, grounding resistance test and power-on test shall be conducted for high-voltage system. Insulation resistance value should meet the specification requirements, such as phase-to-phase and phase-to-ground insulation resistance should not be less than 0.5MΩ.

-Functional tests should be conducted for weak current systems, such as link tests for integrated wiring systems, to check whether signal transmission is normal, including attenuation and crosstalk.