Common Types of Distribution Box System Diagrams:
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### Classification by Power Supply Mode - **Single-phase Distribution Box System Diagram**: It is applicable to places with fewer single-phase electrical equipment, such as households and small offices. It mainly consists of one live wire and one neutral wire. In the system diagram, the live wire and neutral wire are usually represented by L and N respectively. The loads are generally lighting fixtures, small electrical appliances, etc., and the power is relatively low.
- **Three-phase Distribution Box System Diagram**: It is used in places with more three-phase electrical equipment, such as factories, large shopping malls, and high-rise buildings. It is composed of three live wires L1, L2, L3 and one neutral wire N. Sometimes there is also a protective earth wire PE. It can provide relatively large power to meet the power requirements of large equipment. In the system diagram, electrical components and parameters such as loads, circuit breakers, and contactors on each live wire will be marked in detail.
### Classification by the Function of the Distribution Box
- **Power Distribution Box System Diagram**: It is mainly used to introduce the mains power and distribute it to various branch circuits, providing power for the entire electrical system. In the system diagram, the focus is on showing the power incoming line, the main circuit breaker, the busbar, the branch circuit breakers, as well as information such as the numbers, capacities, and wire specifications of each branch circuit.
- **Lighting Distribution Box System Diagram**: It is used for power distribution and control of lighting equipment. It contains multiple lighting circuits. Each circuit is marked with the number of lighting fixtures, power, wire type, laying method, etc. There will also be corresponding control elements such as circuit breakers and switches to achieve individual control and protection of lighting in different areas.
- **Power Distribution Box System Diagram for Motors**: It provides power and control for various power equipment such as motors and electric welding machines. In the system diagram, parameters such as the power, rated current, and starting mode of the power equipment will be indicated, as well as corresponding control and protection elements such as circuit breakers, contactors, and thermal relays to ensure the safe and reliable operation of the power equipment.
- **Emergency Distribution Box System Diagram**: It provides backup power for important loads such as emergency lighting and fire-fighting equipment in emergency situations. In addition to conventional components such as incoming lines and circuit breakers, there will also be emergency power supply devices such as EPS and UPS in the system diagram, as well as corresponding switching devices and control circuits to ensure that it can quickly switch to the emergency power supply when the mains power fails and supply power to emergency equipment.
### Classification by the Structural Form of the Distribution Box - **Fixed Panel Distribution Box System Diagram**: The front of this kind of distribution box has a panel for shielding, but the live parts can still be touched from the back and sides. It has a relatively low protection level and is often used in places where the requirements for power supply continuity and reliability are not high. The system diagram is relatively simple and mainly shows the connection relationships of components such as switches, instruments, and fuses installed on the panel.
- **Drawer-type Distribution Box System Diagram**: It adopts a closed shell made of steel plates. The electrical components of the incoming and outgoing line circuits are installed in drawers that can be pulled out. Each drawer is a functional unit. In the system diagram, the number, position, included electrical components, and connection methods of the drawers will be represented in detail. It has relatively high reliability, safety, and interchangeability and is suitable for places with higher requirements for power supply reliability.
Classification by Application Scenarios
- **Distribution Box System Diagram for Civil Buildings**: It is commonly seen in civil buildings such as residences, apartments, and office buildings. According to different power consumption needs, it is divided into lighting distribution boxes, socket distribution boxes, air-conditioning distribution boxes, etc. The design of the system diagram will fully consider the power consumption habits and safety requirements of residents or office workers, focusing on comfort and convenience.
- **Distribution Box System Diagram for Industrial Use**: It is used in industrial places such as factories and workshops to provide power support for various production equipment. Its system diagram will be customized according to different technological processes and equipment requirements, emphasizing reliability, stability, and overload protection ability to meet the requirements for the continuity and high efficiency of industrial production.
- **Temporary Distribution Box System Diagram**: It is used in places that need temporary power consumption, such as construction sites and temporary activity venues. Examples include single-phase series temporary distribution box system diagrams, three-phase parallel temporary distribution box system diagrams, stage distribution box system diagrams, and automobile temporary distribution box system diagrams. It has the characteristics of simple structure, convenient installation, and high flexibility and can be quickly set up and removed according to actual needs.
