What is the difference between the primary, secondary and tertiary distribution boxes?
Temporary use of electricity is the use of electricity in a certain place, temporary construction of electrical equipment for substations. Then, the distribution boxes at all levels are branched to the respective power stations.
The distribution box is divided into three types of first-class distribution boxes, two-level distribution boxes, and three-level distribution boxes.
The first-level distribution box is to introduce three-phase power, ground and neutral from the transformer.
The first-level distribution box: the construction electricity distribution cabinet is used for construction site construction electricity. It is specially designed for the construction site to meet the construction industry's relevant construction electricity standard. The complete set of products can form a complete three-level protection system for construction and electricity, and achieve the purpose of protection of one machine, one gate and one gate, which is very suitable for various types of compliance projects. The first-class cabinet adopts the lower and lower exit lines, the front door is opened, the main busbar is connected by copper bars, the contact is good, the inner measuring system is safe and beautiful, and the rainproof box top is suitable for field work.
The secondary distribution box is from the power distribution line of the primary distribution box to the temporary power supply.
Applicable to the construction site construction electricity, is specifically designed for the construction site, the design is in line with the construction department's relevant construction electricity standard. The complete set of products can form a complete three-level protection system for construction and electricity, and achieve the purpose of one machine, one gate and one protection. The secondary box is designed with internal and external doors, and the exterior 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 off the ground to put the 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 for the refrigerator, induction cooker, microwave oven air conditioning switch need to be replaced, the main switch also needs to be replaced.
The main switch does not have leakage. The branch switch has the best leakage protection. Because the human body is deadly dangerous through 30mA. The operating current of the leakage switch is 15-30mA
At present, the power distribution lines in the city are generally 4 square meters, and a bit has already used 6 square meters. It is best to replace 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 electric box is set under the main distribution box, a switch box is arranged under the distribution electric box, and electric equipment is arranged 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-stage switch box, it is also necessary to install a first-level leakage protector in the upper-level distribution electric box or the main distribution box. In general, two levels of protection are formed. The principle of “one machine, one brake, one leak, one box, one lock†is that it is strictly forbidden to directly control two or more electrical equipment (including sockets) by the same switchgear.
The difference between the first, second and third levels of the distribution box:
1. First-class distribution box: It is the introduction of three-phase power, ground and neutral from the transformer.
2. Secondary distribution box: It is from the power line of the primary distribution box to the vicinity of the power consumption point.
3. Three-level distribution box: It is the control cabinet of the electrical equipment itself.
In a large power distribution system, in order to facilitate electrical safety and maintenance, the power transmission potential is graded. For example: a residential building. There are 5 units, then the total distribution box that sends power to this building is the first-level distribution box, and then, through the first-level distribution box, then divide 5 branches to give 5 units, in each unit. The distribution box is the secondary distribution box. Then, through the unit distribution box, the branch is distributed to the household. The distribution box in the household is the three-pole distribution box.
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