What should be paid attention to when installing distribution box and distribution cabinet?

source：jinzhong transmission and distribution   time：2020-11-24   Number of hits：840of hits

What should be paid attention to when installing distribution box and distribution cabinet?

There are many taboos and bad points in the installation of the distribution box. We should pay attention to some places in the installation, because some improper operation may have serious consequences. For the aspects that do not pay attention to, I also issue some corrective measures to make up for the previous mistakes. Let's follow Guizhou Power distribution equipment to have a look at the distribution box Distribution cabinet and other electrical installation in the manufacturer of some taboos!

1. Taboo: the lighting distribution box (board) is not inspected when entering the site.

Results: the lighting distribution box (board) was not inspected when entering the site, and it was often found after installation that there was no special grounding bolt for the second floor board, the cross section of the protective ground wire was small, the openable door with electrical appliances was not reliably connected with the metal frame with bare copper flexible wire, the connection between the conductor and the appliance was not firm and there was reverse circle phenomenon, the screw nut did not need galvanized parts, the wire diameter did not meet the requirements and did not comply with the color code There is no card cabinet and electrical circuit diagram, the layout and spacing of appliances are unreasonable, and N and PE terminal blocks are not set. The delay of construction period will also affect the quality.

2. Taboo: the protection line of lighting distribution box (board) is not in place, and the wire diameter does not meet the requirements

Consequence: the protection line of lighting distribution box (board) is not arranged from the terminal, but connected in series with the box frame, the wire diameter is not set according to the requirements, and the protective ground wire is not set for devices with super safe voltage at the door of distribution box, which is easy to cause safety accidents.

Measures: according to the specification requirements, the protective ground wire busbar shall be set in the lighting distribution box (board), and the protective ground wire shall be connected on the bus bar.

The sectional area of protective ground wire should not be less than the cross-sectional area of the largest lead from the power supply to the corresponding electrical appliance, and should also be selected according to relevant regulations. The grounding of distribution box (board) should be firm and good, and there must be anti loosing device.

For openable doors with more than 50V electrical equipment, the movable panel shall be reliably connected with a well grounded metal frame with bare copper cord. The cross-sectional area of bare copper flexible wire shall also be selected according to regulations. The metal box and box body with wall thickness less than 2.5mm should not be used as the span of pipeline. Crimping point of grounding wire and protective ground wire of electric appliance.

3. Taboo: the circuit name is not marked on the gate in the lighting distribution box (board).

Consequence: the circuit name is not marked on the gate in the lighting distribution box (board), which brings inconvenience to the use and maintenance. If the gate that should not be closed is mistakenly closed, it is easy to cause safety accidents.

Measures: generally, according to the requirements of specifications and standards, the circuit system diagram shall be pasted in the door of lighting distribution box (board), and the circuit name shall be marked on the gate, especially if there are AC, DC or different levels of power supply in the lighting distribution box (board), there shall be obvious signs. It brings convenience and safety to users and maintenance personnel.

4. Taboo: the electrical appliances and instruments in the lighting distribution box (board) are not firmly and unevenly installed, and the spacing does not meet the requirements.

Consequence: the electric appliances and instruments in the lighting distribution box (board) are not firmly installed, flat, and the spacing is not enough, which affects the safety of use.

Measures: the electric tools and instruments on the lighting distribution box (board) should be installed firmly, flat and tidy, the spacing should be uniform, the copper terminal should not be loose, the opening and closing should be flexible, and the parts should be complete.