Electrical introduction: Type and structure of low-voltage distribution box

At present, the commonly used distribution box has two kinds of wooden and metal, because the protection level of the metal distribution box is higher, and the metal material is used more at this stage.

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, switchgear mostly refers to 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.

structure

Distribution box structure is divided into two types

1, welding structure: simple sheet metal cutting, bending, opening holes and then welding.

2, assembly structure: the sheet metal parts are processed separately, each part is assembled after processing, with screws and tee reinforcement locking, beautiful appearance, simple operation, can save a lot of transportation costs.

Distribution box and distribution cabinet, distribution panel, distribution touch screen, electrical cabinet, etc., are complete sets of devices for centralized installation of switches, meters and other equipment.