According to the requirements of the specification, the fire resistance of the plastic panel of lighting distribution box can only reach IEC60695-2- 1 standard, but this standard does not require that the plastic panel of lighting distribution box must use flame retardant materials, as long as it meets the heat resistance of this standard.
Distribution box is a massive parameter in data, which generally constitutes a low-voltage forest according to electrical wiring. It is required to assemble switchgear, measuring instruments, protective appliances and auxiliary equipment in a closed or semi-closed metal cabinet or screen to form a low-voltage distribution box. During normal operation, the circuit can be turned on or off by manual or automatic switch.
Purpose of distribution box: to distribute electric energy reasonably and facilitate the opening and closing operation of the circuit. It has a high level of safety protection and can directly display the on-off state of the circuit.
Commonly used distribution boxes are made of wood and metal. Metal distribution boxes are used more because of their higher protection level.
(1) Fixed panel switchgear, usually called switchboard or switchboard. It is an open switch cabinet with a panel cover, which has a protective effect on the front, and the live parts can still be touched on the back and side, so the protection level is low. It can only be used in industrial and mining enterprises with low requirements for continuity and reliability of power supply, and can be used for centralized power supply in distribution rooms.
(2) Protective (i.e. enclosed) switchgear refers to low-voltage switchgear with all sides closed except the installation surface. The electrical components such as switch, protection, monitoring and control of this cabinet are all installed in a closed shell made of steel or insulating materials, which can be reliably installed on or off the wall. Each loop in the cabinet can be isolated without isolation measures, or it can be isolated with grounding metal plate or insulating plate. Usually, the door is mechanically interlocked with the main switch operation. In addition, there is a protective desktop switch cabinet (console) with control, measurement, signal and other electrical appliances installed on the panel. Protective switchgear is mainly used as power distribution device in process site.
(3) Drawer switch cabinet. This kind of switchgear adopts a closed shell made of steel plate, and all the electrical components of incoming and outgoing circuits are installed in drawable drawers, forming a functional unit that can complete a certain type of power supply task. The functional unit is separated from the bus or cable by grounding metal plate or functional plate made of plastic to form three areas: bus, functional unit and cable. There are also isolation measures between functional units. Drawer switch cabinet has high reliability, safety and interchangeability, and is a relatively advanced switch cabinet. Most switch cabinets refer to drawer-type switch cabinets. It is suitable for industrial and mining enterprises and high-rise buildings as centralized control distribution centers, which requires high reliability of power supply.
(4) Power and lighting distribution control box. Mostly closed vertical installation. Due to different use occasions, the protection level of the shell is also different. It is mainly used as a power distribution device in the production places of industrial and mining enterprises. Shanghai Shilin Electric Appliance Co., Ltd. is a high-tech enterprise specializing in the production of safety distribution boxes, surge protectors and safety low-voltage appliances in China. Shanghai Shilin Company relies on years of accumulated experience in the production of safety appliances, excellent product quality and good after-sales service. Over the years, we have been pursuing to be the safest electrical products and bring happiness to every family. The products have passed CCC certification in China, which is a product conformity assessment system implemented by governments of various countries in accordance with laws and regulations to protect consumers' personal safety and national security and strengthen product quality management. In addition, it has passed the IS0900 1 international quality management system certification, and the company has also been listed as a member enterprise of the Terminal Electricity Sub-committee of the National Electrical Standards Committee. Following the enterprise tenet of "technology-based, quality-guaranteed and service-oriented", it has continuously improved the construction of software and hardware facilities of the enterprise to ensure the safety and industry-leading terminal appliances produced by Shanghai Shilin. Some of the products produced were listed in the "Spark Plan" products in Shanghai, recommended by the Sichuan Provincial Construction Committee, and recommended by the Ministry of Construction, and won the gold medal in the Ten-year Achievement Expo of Patent Technology. With the mentality of being a world brand, we will ensure the quality of every finished electrical appliance. While vigorously promoting the reconstruction project of the national two networks, the company adheres to the concept of "safe appliances, happiness at home", and independently develops the rural power network product-intelligent comprehensive leakage protector, which has been included in the architectural standard design 02 D40 1 atlas of Sichuan Province. 2 1 century is the era of knowledge economy. It has created excellent safety product quality, devoted itself to the prosperity of the electrical industry, implemented customer satisfaction projects, and achieved market scale, thus becoming the first supplier of safety distribution electrical appliances in China.
Distribution box is a low-voltage distribution box that assembles switchgear, measuring instruments, protective appliances and auxiliary equipment in a closed or semi-closed metal cabinet or screen according to the requirements of electrical wiring. During normal operation, the circuit can be turned on or off by manual or automatic switch. When there is a fault or abnormal operation, cut off the circuit or give an alarm with the help of the protection device. Through measuring instruments, various parameters in operation can be displayed, and some electrical parameters can be adjusted to prompt or signal deviations from normal working conditions.
Your problem may be the ambient temperature or the poor quality of the distribution box itself.
The low-voltage appliances in the distribution box are composed of fuses, AC contactors, residual current action protectors, capacitors and meters. The upper limit of ambient air temperature does not exceed 40℃; 24-hour average ambient temperature shall not exceed 35℃; The lower limit of ambient air temperature is not lower than -5℃ or -25℃.
The distribution box reconstructed by rural power grid runs outdoors, which not only generates high temperature in direct sunlight, but also generates heat during operation. Therefore, in the hot summer, the temperature in the box will reach above 60℃, which greatly exceeds the environmental temperature stipulated by these appliances.
In the rural power grid transformation, due to the large number of distribution boxes and short construction period, the distribution box factory needs the supply time and quantity of low-voltage electrical appliances, which leads to the phenomenon of lax product quality requirements, resulting in some products failing soon after they are put into production. For example, some models of AC contactors can't run because the closing coil of the contactor burned out shortly after the distribution box was put into operation.
Due to improper selection of AC contactor capacity during manufacturing, AC contactors with the same capacity were installed in different outlet circuits, and the imbalance of three-phase load was not taken into account, resulting in that the current grade of some outlet contactors could not be improved by one current grade on the basis of normal selection.
The power of the distribution box in the community, or what you said, depends on the location of the community and the construction area of a single set. If it is an ordinary community, consider lighting and general electricity consumption, such as air conditioners and water heaters. Generally, it is considered that the value below 100 square meter is about 8 to 10KW, but it is not absolute. The higher the position, the larger the area of a single set and the greater the power consumption.