What is the difference between primary, secondary and tertiary distribution boxes?

1. The first-level distribution box is relative to a certain building or factory, which is the first-level distribution box of the cable directly drawn from the substation or municipal power distribution station. Mainly play the role of distribution and aggregation.

2. The secondary distribution box is the distribution box to which the cables drawn from the primary distribution box are connected.

3. The third-level distribution box is the distribution box to which the cables drawn from the second-level distribution box are connected.

Note: The three-level power distribution is mainly to ensure that each power-consuming device has electricity available; each power-consuming device can be used independently without affecting each other. And save wire.

The first-level distribution box is to introduce three-phase power supply, ground wire and neutral wire from the transformer.

First-class power distribution box: The construction power distribution cabinet is used for construction site construction. It is specially designed for the special situation of the project construction site and is designed to meet the relevant construction power specifications and standards of the construction department. A complete set of products can form a complete three-level protection system for construction electricity to achieve the purpose of one machine, one gate and one protection, which is very suitable for various projects that meet the standards. The first-level cabinet adopts bottom-in and bottom-out cables, and the front door is opened. The main busbar is connected by copper bar, which has good contact. There is a metering system inside, which is safe and beautiful. The top of the rainproof box is suitable for field work.

The second-level distribution box is from the power line of the first-level distribution box to the temporary electricity

Applicable to construction site construction electricity, it is specially designed for the special situation of the project construction site and meets the relevant construction electricity specifications and standards of the construction department. A complete set of products can form a complete three-level protection system for construction electricity to achieve the purpose of one machine, one gate and one protection. The secondary box is designed with inner and outer doors, and the appearance is sprayed with plastic. It is safe and beautiful, and the top of the rainproof box is suitable for field work.

The secondary distribution box should be placed 1.5M away from the ground

Main switch 60A——DZ47-63 100A

Lighting switch 16A——DZ47-63 16A two-phase leakage switch

Air conditioner 1.5P—20A—DZ47-63 20A two-phase leakage switch

Electric water heater 8000W + washing machine - DZ47-63 60A two-phase leakage switch (because there is no 40A switch, only 32A)

Socket switch 16A - DZ47-63 16A

The main electrical appliances are refrigerators, induction cookers, microwave ovens

The A/C switch needs to be replaced, as does the main switch.

The main switch does not need to carry leakage. The branch switch with leakage protection is the best. Because the human body is fatally dangerous through 30mA. The operating current of the leakage switch is 15-30mA

At present, the distribution lines in the city are generally 4 square meters, and some 6 square meters have been used. It is better to replace the 2.5 square.

The three-level distribution box is the control cabinet of the electrical equipment itself.

Three-level power distribution: that is, a distribution box is set under the main distribution box, a switch box is set under the distribution box, and electrical equipment is set under the switch box to form a three-level power distribution. "Two-level protection" mainly refers to the use of leakage protection measures. In addition to installing a leakage protector in the final switch box, a first-level leakage protector should also be installed in the upper-level distribution box or the main distribution box. , forming a two-level protection as a whole. The principle of "one machine, one gate, one leak, one box, one lock" means that it is strictly forbidden for the same switch to directly control two or more electrical equipment (including sockets).