Power distribution box is a kind of distribution box. The power distribution box is divided into power distribution box and lighting distribution box, which are the final equipment of the distribution system. The switchgear, measuring instruments, protective appliances and auxiliary equipment are assembled in a closed or semi-closed metal cabinet or screen according to the electrical wiring requirements to form a low-voltage distribution device. The power distribution box is divided into power distribution box and lighting distribution box, which are the final equipment of the distribution system. The switchgear, measuring instruments, protective appliances and auxiliary equipment are assembled in a closed or semi-closed metal cabinet or screen according to the electrical wiring requirements to form a low-voltage distribution device. The circuit can be switched on or off by manual or automatic switch during normal operation.

In case of failure or abnormal operation, cut off the circuit or alarm with the help of protective appliances. The measuring instrument can display various parameters in operation, and can also adjust some electrical parameters to prompt or signal deviation from the normal working state. It is commonly used in power generation, distribution and substation.

First, lighting distribution box

Wall installation, terminal distribution, the main load is lighting appliances, ordinary sockets, small motor load, etc., the load is small, mostly for single-phase power supply, there are also three-phase power supply but less applications, the total current is generally less than 63A, single outlet circuit current is less than 15A. Generally allow non-professional personnel to operate.

Second, power distribution box

Floor installation, the main load is power or lighting and power used together, and a large capacity distribution box to provide power for the lighting load (beyond the 63A class, non-terminal distribution, such as the upper level of the lighting distribution box). Usually only professionals are allowed to operate.

Third, power distribution box classification

3.1 Classification according to the requirements of the power supply system:

(1) first-level power distribution equipment, collectively referred to as the power distribution center. They are centrally installed in an enterprise's substation and distribute power to lower-level distribution equipment in different locations. This level of equipment is close to the step-down transformer, so the electrical parameters are higher, and the output circuit capacity is larger.

(2) Secondary distribution equipment, is the power distribution cabinet and motor control center collectively. The power distribution cabinet is used in the occasions where the load is relatively dispersed and the circuit is less; The motor control center is used for load concentration and many circuits. They distribute the electrical energy of a circuit of the upper level distribution equipment to the nearest load. This level of equipment should provide protection, monitoring and control of the load.

(3) The final power distribution equipment is collectively known as the lighting power distribution box. They are far from the power supply center and are distributed small capacity distribution devices.

3.2 Classification by structural features and uses:

(1) Fixed surface type switchgear, often called switch board or distribution panel. It is an open-type switch cabinet with a panel shield, the front has a protective effect, the back and side can still touch the live part, the protection level is low, can only be used for industrial and mining enterprises with low requirements for power supply continuity and reliability, and can be used for centralized power supply in the substation room.

(2) Protective (that is, closed) switchgear refers to a low-voltage switchgear with all sides closed except the mounting surface. The switch, protection and monitoring control electrical components of this cabinet are installed in a closed enclosure made of steel or insulating materials, reliable wall or off-wall installation.

Each circuit in the cabinet can be isolated without isolation measures, or can be isolated by grounding metal plate or insulation board. Usually the door operates with a mechanical interlock with the main switch.

In addition, there is a protective table-type switch cabinet (that is, the console), which is equipped with control, measurement, signal and other electrical appliances on the panel. The protected switchgear is mainly used as a power distribution device in the process site.

(3) Drawer type switch cabinet. This kind of switch cabinet is made of steel plate closed shell, and the electrical components of the inlet and outlet circuit are installed in the drawer that can be drawn out to form a functional unit that can complete a certain type of power supply task. Between the functional unit and the bus bar or cable, separated by a grounded metal plate or a plastic functional board, forming three areas of the bus bar, functional unit and cable.

There are also isolation measures between each functional unit. Drawer type switchgear has high reliability, safety and interchangeability, is a more advanced switchgear, the production of switchgear, most of the drawer type switchgear. They are suitable for industrial and mining enterprises and high-rise buildings that require high reliability of power supply, as a centralized control distribution center.

(4) Power, lighting distribution control box. Mostly closed vertical installation. The protection level of the shell is also different due to the different use occasions. They are mainly used as power distribution devices in the production site of industrial and mining enterprises.

Qingdao Tianxing Cable Co., Ltd. focuses on the production of customized wire and cable manufacturers, main: fire wire and cable, power cable, control cable and other products, exported to more than 40 countries and regions around the world, the annual production capacity of 1 billion yuan. 6000 square meters of storage, standing hundreds of millions of inventory, order demand for rapid distribution and delivery, large prices more favorable. Hotline: 16678668098