Use 4mm soft wire.
The distribution box is a massive parameter in data. It generally constitutes low-voltage forest electrical wiring. It requires switching equipment, measuring instruments, protective appliances and auxiliary equipment to be assembled in closed or semi-closed metal cabinets or screens. On the width, it forms a low-voltage distribution box. During normal operation, the circuit can be connected or disconnected with the help of a manual or automatic switch.
The purpose of the distribution box: to reasonably distribute electric energy and facilitate the opening and closing of circuits. It has a high level of safety protection and can visually display the conduction status of the circuit.
Commonly used distribution boxes are made of wood and metal. Because metal distribution boxes have a higher protection level, metal ones are more commonly used.
(1) Fixed panel switch cabinet, often called switch panel or distribution panel. It is an open-type switch cabinet with a panel shield. It has a protective function on the front, but the back and sides can still touch the live parts. The protection level is low and can only be used in industrial and mining enterprises with low requirements for power supply continuity and reliability. For centralized power supply in the substation room.
(2) Protective (i.e. closed) switch cabinet refers to a low-voltage switch cabinet in which all sides except the installation surface are enclosed. The electrical components of this kind of cabinet, such as switches, protection, monitoring and control, are installed in a closed shell made of steel or insulating materials, and can be installed on or off the wall. There may be no isolation measures between each circuit in the cabinet, or a grounded metal plate or insulating plate may be used for isolation. Usually the door is mechanically interlocked with the main switch operation. There is also a protective bench-type switch cabinet (i.e. console), with control, measurement, signal and other electrical appliances installed on the panel. Protective switch cabinets are mainly used as power distribution devices at process sites.
(3) Drawer switch cabinet. This type of switch cabinet uses a steel plate to make a closed shell, and the electrical components of the incoming and outgoing circuits are installed in pull-out drawers to form a functional unit that can complete a certain type of power supply task. The functional units are separated from the busbar or cable by a grounded metal plate or a functional board made of plastic, forming three areas: busbar, functional unit and cable. There are also isolation measures between each functional unit. Drawer-type switch cabinets have high reliability, safety and interchangeability, and are relatively advanced switch cabinets. Most switch cabinets refer to drawer-type switch cabinets. They are suitable for industrial and mining enterprises and high-rise buildings that require high power supply reliability, and serve as centralized control power distribution centers.
(4) Power and lighting distribution control box. Most are closed vertical installations. Due to different use occasions, the protection level of the shell is also different. They are mainly used as power distribution devices at the production sites of industrial and mining enterprises. Shanghai Shilin Electric Co., Ltd. is a high-tech enterprise currently focusing on the production of safety distribution boxes, surge protectors, and safe low-voltage electrical products in China. Shanghai Shilin Company relies on years of accumulated experience in the production of safety electrical appliances, relying on excellent product quality and good After-sales service, for many years, we have pursued making the safest electrical products and delivering happiness to every home. The product has passed China's national compulsory product CCC certification, which is a product conformity assessment system implemented by governments in order to protect consumers' personal safety and national security, strengthen product quality management, and implement in accordance with laws and regulations. In addition, it has also passed the IS09001 international quality management system certification, and the company has also been listed as a "member enterprise of the Terminal Electricity Branch of the National Electrical Standardization Committee". Following the corporate purpose of "technology as the foundation, quality as the guarantee, and service as the core", through continuous improvement The company's software and hardware facilities are constructed to ensure that the terminal electrical appliances produced by Shanghai Shilin are safe and leading in the industry. Some of the products produced have been included in Shanghai's "Spark Plan" products, recommended products by the Sichuan Provincial Construction Committee, and recommended products for engineering construction by the National Ministry of Construction for many times, and won the gold medal at the Patented Technology Ten Years Achievements Expo. With the mentality of being a world brand, we ensure the quality of every finished electrical appliance. As the two-network transformation project is vigorously promoted across the country, the company adheres to the idea of ??"safe appliances, happy home" and independently develops and develops a rural network product - intelligent leakage comprehensive protector, which is included in the Sichuan Province Building Standard Design Sichuan 02 D401 Atlas The 21st century is an era of knowledge economy. We must create excellent safety product quality, be committed to the prosperity of the electrical industry, implement user satisfaction projects, scale up market operations, and become the number one supplier of domestic safety distribution appliances.
The distribution box is a low-voltage distribution box that assembles switching equipment, measuring instruments, protective appliances and auxiliary equipment in a closed or semi-closed metal cabinet or on a screen according to electrical wiring requirements. During normal operation, the circuit can be connected or disconnected with the help of a manual or automatic switch.
When there is a fault or abnormal operation, the circuit is cut off or the alarm is generated by using protective equipment. Measuring instruments can display various parameters during operation, adjust certain electrical parameters, and provide prompts or signals for deviations from normal working conditions.
Your problem may lie in the ambient temperature or the poor quality of the distribution box itself.
The low-voltage electrical appliances in the distribution box are composed of fuses, AC contactors, residual current action protectors, capacitors and meters. The upper limit of the ambient air temperature does not exceed 40°C; the 24-hour average of the ambient air temperature does not exceed 35°C; the lower limit of the ambient air temperature is not lower than -5°C or -25°C.
The distribution box transformed by the rural power grid operates outdoors. It is not only exposed to direct sunlight and generates high temperatures, but also generates heat during operation. Therefore, in the high temperature season of midsummer, the temperature inside the box will reach Above 60℃, the temperature at this time greatly exceeds the ambient temperature specified by these electrical appliances.
During the transformation of rural power grids, due to the large number of distribution boxes required and the short construction period, the distribution box factory needed to supply low-voltage electrical appliances in a short time and in large quantities, which resulted in concerns about product quality. The phenomenon of loose requirements has caused some products to malfunction soon after they were put into operation. For example, some types of AC contactors cannot operate due to the burnt out contactor closing coil shortly after the distribution box is put into operation.
Due to improper selection of AC contactor capacity during manufacturing, AC contactors of the same capacity were installed on different outgoing circuits, and the unbalanced situation of the three-phase load was not taken into account. The current level of the outlet contactor is based on the normal selected model, and is increased by one current level selection.
I hope I can help you clear up your doubts.