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14 installation taboo of lighting distribution boxes (Part two)

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Taboo 8:

 

The circuit name is not indicated on the brake

 

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

 

Measures: generally according to the requirements of specifications and standards, the door of lighting distribution box (board) should be pasted with circuit system diagram, and the circuit name should be marked on the brake, especially if there are AC, DC or different levels of power supply in the lighting distribution box (board), there should be obvious signs, which will bring convenience to the work of users and maintenance personnel.

 

Taboo 9:

 

The installation of electric appliances and instruments is not firm and flat, and the spacing does not meet the requirements

 

Consequences: the electrical appliances and instruments in the lighting distribution box (board) are not firmly and evenly installed, and the space is not enough, which will affect the use safety.

 

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

 

Taboo 10:

 

The conductor is not threaded according to the color code

 

Consequences: if the wires are not threaded according to the color code, it is difficult to balance the load when using single-phase circuit because it is not easy to identify the three-phase power supply, resulting in serious three-phase imbalance. When using three-phase equipment, because there is no color code, it is easy to mix the phase sequence when wiring, and it is difficult to grasp the direction of rotation when some equipment needs fixed steering.

 

Measures: in order to ensure safety and construction convenience, the main line of the lighting distribution box (board) through which the wire passes through the pipe according to the regulations can not be color separated, but the main line circuit from the pipe orifice to the main switch of the distribution box (board) and each power branch should be color separated according to the requirements of the color code, so that the load can be better balanced when the single-phase circuit is used, and the three-phase power supply should be connected according to the phase sequence, So as to ensure the normal operation of the equipment.

 

Taboo 11:

 

Removable metal plate, not connected to protective earth system

 

Consequences: the removable metal plate in the lighting distribution box is equipped with all kinds of electrical accessories, and the protective ground wire is not connected, which is easy to cause electric shock accidents.

 

Measures: the removable metal plate in the lighting distribution box should have reliable grounding protection, so it is required that the metal plate should be equipped with a special non removable grounding screw, and the protective ground wire should be effectively connected with it. The diameter of protective ground wire shall be matched according to the requirements of specifications and standards to ensure safe use.

 

Taboo 12:

 

Improper location in shaft

 

Consequences: the lighting distribution box is located in the shaft, because the shaft generally has strong and weak electricity, and the space is very narrow, not easy to operate, a little careless, easy to cause safety accidents.

 

Measures: after receiving the drawings, the drawings shall be carefully reviewed. If it is found that the layout of the electrical pipes and boxes in the shaft can not meet the requirements of the specifications, it shall be put forward in the design disclosure. It is generally required that there should be no less than 0.8m operation and maintenance distance in front of the lighting distribution box and terminal box in the electrical shaft. In order to prevent the interference of strong current to weak current, the strong current and weak current should be respectively arranged on both sides of the shaft or isolation measures should be taken.

 

Taboo 13:

 

The laying of wires and pipelines in floor type distribution box is too low

 

Consequence: the pipe orifice of the wire and pipeline laid in the floor type distribution box is too low, which is easy to cause water and debris to enter into the pipe and reduce the insulation strength of the wire.

 

Measures: for the wire protection pipe in the floor type distribution box, the pipe orifice should be 50 ~ 80mm higher than the foundation surface of the distribution box. The pipeline shall be arranged in order, and the nozzle shall be horn shaped.

 

Taboo 14:

 

Wiring and electrical installation, lighting engineering, all metal accessories

 

It's not galvanized and it's not anticorrosive

 

Consequence: metal accessories are not galvanized parts or not treated with anti-corrosion, which are easy to corrode and shorten service life.

 

Measures: in order to ensure the project quality and prolong the service life, it is required that the metal accessories used in the wiring and electrical installation lighting engineering, such as pipe clip, bracket, hook, pull ring, box (box) bolt, nut and other ferrous metal accessories, should be galvanized or coated with anti-corrosion paint.

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