What Do The First, Second And Third Level Distribution Boxes Mean?

What do the first, second and third level distribution boxes mean?

1. First level distribution box

The first level distribution box is the main distribution box in the power distribution system, which is responsible for accessing the main power and distributing the main power. As the core of the entire distribution system, the first level distribution box undertakes multiple functions such as switching, distribution and protection of the main power supply.

Application scenario

The first level distribution box is usually used in places such as substations, distribution rooms, large industrial plants or commercial buildings.

Function

The main function of the first level distribution box is to send power from the main power supply to each branch circuit, and includes functions such as main switch, total current protection, overload protection, short circuit protection, etc.

Technical requirements

The design requirements of the first level distribution box are relatively high, and it needs to have a strong load capacity, be able to withstand a large amount of current load, and have good electrical isolation, lightning protection, waterproof and other safety protection designs.

2. Second level distribution box

The second level distribution box is a distribution box in the distribution system, which is mainly responsible for further distributing the power distributed by the first level distribution box to the lower level electrical equipment and circuits.

Application scenarios

The secondary distribution box is usually used in medium and large buildings, industrial parks, office buildings and other places to distribute the power of the primary distribution box to various areas.

Function

The function of the secondary distribution box is mainly to distribute power from the primary distribution box to the secondary circuit, and provide independent switches and protection devices for each circuit.

Technical requirements

Compared with the primary distribution box, the load capacity of the secondary distribution box is relatively small, but it still requires sufficient current carrying capacity, and is required to have short-circuit protection, leakage protection and other functions.

3. Tertiary distribution box

The tertiary distribution box is the last distribution box in the distribution system, which is usually used to distribute power to a single device or user end.

Application scenarios

The tertiary distribution box is generally used in various units, workshops, computer rooms and other places in commercial buildings, responsible for providing power to terminal equipment and distributing power for the last mile.

Function

The main function of the tertiary distribution box is to provide independent power supply for each power load, and provide corresponding current protection, leakage protection and other functions.

Technical requirements

The technical requirements for the three-level distribution box are relatively low, but the safety and reliability of the equipment must still be guaranteed, and special attention must be paid to the precise control of current and overload protection.