The layout and wiring principles of components inside the low voltage distribution cabinet are crucial to ensure the safe, stable and efficient operation of the power distribution system.
1. Component layout principles
The layout of components inside the low voltage distribution cabinet should follow the principles of compactness, rationality and safety. Major components such as circuit breakers, disconnectors, current transformers, etc. should be installed in locations that are easy to operate and maintain. At the same time, considering the heat dissipation and ventilation requirements, components with large heat generation should be appropriately dispersed to avoid local overheating. In addition, a proper distance should be maintained between components to prevent electrical short circuits and interference.
2. Incoming and outgoing line layout
The incoming line is usually located above or on the side of the distribution cabinet for easy connection to the power supply. Safety measures such as leakage protectors and disconnectors should be configured at the incoming line. The outgoing lines are distributed in different locations according to the power demand and are connected to various power-consuming equipment through busbars or cables. The outgoing line layout should be clear and easy to inspect and maintain.
3. Busbar and cable wiring principles
As the main power transmission component inside the distribution cabinet, the busbar should be firmly and reliably wired with good contact. Special connectors should be used at the busbar connection, and conductive paste should be applied to reduce contact resistance. When wiring cables, appropriate cable specifications and materials should be selected to ensure electrical performance and safety. The terminal blocks should be crimped firmly, and the wiring method should comply with the relevant requirements of electrical engineering.
4. Principles of wiring of electrical components
When wiring electrical components such as relays and contactors, the correct wiring diagram should be followed to ensure that the wiring is correct. At the same time, the screws of the terminal blocks must be tightened to prevent looseness and poor contact or short circuit. For signal lines that need to be shielded, shielded cables should be used and properly grounded.
5. Grounding and safety protection
The grounding system inside the low voltage distribution cabinet should be complete and reliable, and all components and equipment that need to be grounded should be connected to the grounding busbar or common grounding point. The grounding resistance should meet the specified value to ensure electrical safety. In addition, safety protection measures such as door locks and partitions should be set up inside the distribution cabinet to prevent misoperation and electric shock accidents.
