Taboo 1: lighting distribution box (board) has not been inspected when entering the site.
Consequences: lighting distribution box (board) has not been inspected when entering the site. Often after installation, it is found that the second-layer board does not have special grounding bolts, protects grounding wire with small cross-section, openable doors equipped with electrical appliances are not reliablely connected to the metal frame with bare copper soft wire, the wire connection between the wire and the appliance is not firmly connected, there is a reverse ring phenomenon, the screws and the master do not use galvanized parts, the wire diameter does not meet the requirements, there is no color mark, there is no card cabinet and electrical circuit diagram, the layout and interval of the appliance are unreasonable, and the N and PE terminal strips are not set, etc. After modification, delaying the construction period will also affect the quality.
measures: first, when processing and ordering, you should propose technical requirements to the manufacturer that meet the design and specification standards. Please ask the manufacturer to make samples and then produce them after passing the acceptance; and will be inspected and accepted strictly in accordance with the design and specification standards when entering the site of , and then install them after confirming that they are qualified.
Taboo 2: The lighting distribution box (board) uses wood material that is not flame retardant.
Consequences: If the lighting distribution box (board) is used in humid and dusty places, it is easy to mold and leak; in addition, the wooden box (board) is not fire-retardant, which is easy to cause fire, which is an unsafe hidden danger.
Measures: In order to ensure safe use, the lighting distribution box (board) is required not to be made of combustible materials. Even in a dry and dust-free place, the wooden distribution box (board) used should be flame retardant before use.
Taboo 3: The lighting distribution box (board) is not installed firmly, the elevation does not meet the requirements, and when concealed, the edges of the panel are not close to the wall.
Consequences: The installation elevation of the lighting distribution box (board) does not comply with the regulations, the installation is not firm, the box is not vertical, and when concealed, the edges of the panel are not close to the wall, which affects the use function and has a bad appearance.
Measures: The elevation should meet the design requirements. When there are no design regulations, the bottom edge of the lighting distribution box should be 1.5m from the ground. The bottom edge of the lighting distribution board should be 1.8m away from the ground. The lighting distribution box (board) should be installed firmly, and the allowable deviation of the installation verticality should not be greater than 3mm. When concealed, there should be no gaps around the distribution box, the edges of the panel should be close to the wall, and anticorrosion paint should be applied to the contact parts of the box and the building and structure.
Taboo 4: The lines inside the lighting distribution box (board) are messy and not tied into bundles.
Consequences: The lines inside the lighting distribution box (board) are messy, and the second-layer board in the box presses the pipe port, which affects the wire entering the box. If it is barely squeezed in, the wire insulation damage will be damaged over time, which can easily cause short circuits. It also makes maintenance inconvenient and affects the appearance.
Measures: When using metal boxes in lighting distribution boxes, anti-rust and corrosion treatment should be done. The outlet holes in the box should not be opened with electrical welding. Each pipe should be installed with holes. The protective sleeves should be installed before threading. The lines should be arranged neatly, and the position of the pipes entering the box should be reasonably laid out. Do not let the second-layer board press on the pipe. The wires in the box should be straight around the box and tied in neat bundles.
Taboo 5: N and PE busbars are not set in the lighting distribution box (board).
Consequence: No N and PE busbars are set in the lighting distribution box (board), so the safe operation of the line cannot be guaranteed.
Measures: In the lighting distribution box (board), neutral wire (N wire) and protective ground wire (PE wire) busbars should be set up separately. The neutral wire and protective ground wire should be connected on the busbar and should not be twisted and should be numbered.
Taboo 6: The wiring of the spiral fuse installed in the lighting distribution box (board) is incorrect.
Consequence: The spiral fuse installed in the lighting distribution box (board) is incorrectly connected to the power cord to the threaded terminal, which affects the replacement of the melt core, and is improperly operated and may easily cause electric shock accidents.
Measures: To ensure safety, the power cord of the spiral fuse installed in the lighting distribution box (board) should be connected to the terminal of the intermediate contact, and the load cord should be connected to the terminal of the thread.
Taboo 7: The lighting distribution box (board) protection line is not done properly and the wire diameter does not match.
Consequence: The protection wires of the lighting distribution box (board) are not arranged from the terminals, but are connected in series using the box frame, the wire diameter is not set as required, and devices with ultra-safe voltage in the distribution box door do not have protective ground wires, which can easily cause safety accidents.
Measures: According to the specifications, a busbar of protective ground wire should be installed in the lighting distribution box (board), and the busbar should be connected on the busbar. The cross-sectional area of the protective ground wire should not be less than the cross-sectional area from the power supply to the maximum lead wire of the electrical appliance; and it should also be selected in accordance with relevant regulations. The grounding on the distribution box (board) should be firm and good, and there must be anti-loosening devices. For openable doors equipped with more than 50V electrical equipment, the movable panel should be reliably connected to a well-grounded metal frame with bare copper soft wire. The cross-sectional area of bare copper soft wire should also be selected according to regulations. The metal box and box body with a wall thickness of less than 2.5mm should not be used as crimping points for the span grounding wire of the pipeline and the protective grounding wire of electrical appliances.
Taboo 8: The circuit name is not indicated in the gate in the lighting distribution box (board).
Consequences: The gate in the lighting distribution box (board) does not have the circuit name, which causes inconvenience to use and maintenance. If the gate that should not be closed by mistake is easily caused by safety accidents.
Measures: generally follows the specifications and standards. A circuit system diagram should be posted in the door of the lighting distribution box (board), and the circuit name should be marked on the gate. Especially if there are AC, DC or different levels of power supply in the lighting distribution box (board), it should have a clear mark. It brings convenience and safety to the work of users and maintenance personnel.
Taboo 9: The lighting distribution box, the electrical appliances and instruments in (board) are not installed firmly or flatly, and the spacing does not meet the requirements.
Consequences: The electrical appliances and instruments in the lighting distribution box (board) are not installed firmly, flatly, and insufficiently spaced, which affects the safety of use.
measures: The power supply and instruments on the lighting distribution box (board) should be installed firmly, flatly and neatly, the spacing should be uniform, the copper terminals are not loose, flexible opening and closing, and complete parts.
Taboo 10: The wires in the lighting distribution box (board) are not threaded according to the color mark.
Consequences: If does not thread the color mark, when using a single-phase circuit, it is difficult to balance the load because it is not easy to identify the three-phase power supply, resulting in serious three-phase imbalance. When using three-phase equipment, due to the lack of color mark, it is easy to mix the phase sequence during wiring. When some equipment needs to be fixed steering, it is difficult to grasp the direction of its rotation.
Measures: In order to ensure safety and facilitate construction, the conductors in the lighting distribution box (plate) can pass into the main line in the pipe according to regulations, but the trunk circuit from the pipe port to the main switch of the distribution box (plate) and each power branch should be separated according to the color specification requirements. In this way, when using a single-phase loop, its load can be better balanced, and when using a three-phase power supply, wiring is carried out in phase sequence to ensure the normal operation of the equipment.
Taboo 11: The removable metal plate in the lighting distribution box (board) is not connected to the protective ground system.
Consequences: The detachable metal plate in the lighting distribution box is equipped with various electrical accessories, and does not connect to protective ground wire, which can easily 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 non-removable special grounding screws, and the protective ground wire should be effectively connected to it. The wire diameter of the protective ground wire should be matched according to the specifications and standards to ensure safe use.
Taboo 12: The lighting distribution box is inappropriately located in the shaft.
Consequences: The lighting distribution box is located in the vertical shaft. Since there are generally strong and weak electricity in the vertical shaft, and the space is very small, which is inconvenient for operation. If you are not careful, it is easy to cause safety accidents.
Measures: After receives the drawing, it should carefully review the drawing. If it is found that the layout of the electrical pipelines and boxes in the shaft cannot meet the requirements of the specifications, it should be proposed during the design briefing. Generally, it is required that no less than O be left in front of the lighting distribution box and terminal box in the electrical shaft. 8m operating and maintenance distance. In order to prevent the interference of strong electricity to weak electricity, strong electricity and weak electricity are arranged on both sides of the shaft or isolation measures are taken.
Taboo 13: The wiring and pipelines in the floor-standing distribution box are laid too low.
Consequence: The wire pipe openings laid in the floor-standing distribution box are too low, which can easily cause accumulated water and debris to enter the pipe, reducing the insulation strength of the wire.
Measures: The wire protection pipe in the floor-standing distribution box should be 50 to 80mm higher than the foundation surface of the distribution box. The pipelines should be arranged neatly and the pipe openings should be horn-shaped.
Taboo 14: All metal accessories in wiring and electrical installation lighting projects are not galvanized and not corrosion-proof.
Consequences: metal accessories are not galvanized parts or are not anti-corrosion treatment, they are extremely easy to corrode and have shortened service life.
Measures: In order to ensure the quality of the project and extend the service life, it is required that the metal accessories used in wiring and electrical device lighting projects such as ferrous metal accessories such as tube card , bracket, hook , pull ring and box (box) bolts, nuts, etc. should be galvanized or anticorrosive painted.
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