Distribution Cabinet Installation Of The Taboo

Distribution box distribution cabinet installation "ten taboos" Taboo 1: lighting distribution box, (board) inside the electrical equipment, instrument installation is not firm, not smooth, spacing does not meet the requirements Consequences: the installation of electrical appliances and instruments in the lighting distribution box (board) is not firm, smooth, and the spacing is not enough, which affects the safety of use. Measures: lighting distribution box (board) on electrical equipment, instruments should be installed firmly, level off, neat, spacing should be even, copper terminal no loose, open and close flexible, complete parts. Tabu 2: the wiring and pipeline in the floor type distribution cabinet are laid too low Consequence: the pipe orifice of the electric wire and pipeline laid in the floor type distribution cabinet is too low, which is easy to let water and debris into the pipe, reducing the insulation strength of the wire. Measures: for the wire protection pipe in the floor type distribution box, the pipe mouth should be 50 ~ 80mm higher than the base surface of the distribution box. The pipes should be arranged neatly, and the pipe mouth should be flared. Contraindication 3: N and PE bus are not set in lighting distribution box (board) Consequence: N and PE bus are not set in the lighting distribution box (board), so the safe operation of the line cannot be guaranteed. Measures: in the lighting distribution box (board), the zero line (N line) and the protection ground line (PE line) bus shall be set up respectively. The zero line and the protection ground line shall be connected on the bus, and shall not be splined, and shall be numbered. Tabu 4: lighting distribution box (board) using non-flame retardant wood materials Consequences: lighting distribution box (board) if the use of wood in wet dusty places easy to mildew and leakage; In addition, wooden boxes (boards) without flame retardant treatment, easy to cause fire, is an unsafe hidden danger. Measures: in order to ensure safe use, lighting distribution box (board) shall not be made of combustible materials. Even in the dry and dust-free place, the wooden distribution box (board) should also be used after flame retardant treatment. No. 5: the inner gate of the lighting distribution box (board) is not marked with the name of the circuit Consequence: the floodgates in the lighting distribution box (board) are not marked with the name of the circuit, which brings inconvenience to the use and maintenance. Measures: according to the standard requirements, lighting distribution box (board) door should be affixed with the circuit system diagram, and the name of the circuit should be marked on the brake, especially lighting distribution box (board) if there are ac, dc or different levels of power supply, should have a clear sign. Bring convenience and safety to the work of users and maintenance personnel. No. 6: detachable metal plate in lighting distribution box (board), not connected with protective ground wire system. Consequence: the detachable metal plate in the lighting distribution cabinet is equipped with various electrical accessories, which do not connect the protective ground wire, easily causing electric shock accident. Measures: the detachable metal plate in the lighting distribution cabinet shall have reliable grounding protection. Therefore, the detachable special grounding screw shall be set on the metal plate, and the protective ground wire shall be effectively connected with it. The wire diameter of the protective ground wire shall be matched according to the specification standard to ensure safe use. Tabu 7: lighting distribution box (board) inside the line cross messy, not tied into bundles Consequence: the wiring in the lighting distribution box (board) is messy, and the two-layer board in the box presses the tube mouth tightly, which affects the conductor entering the box. And make maintenance inconvenience, affect the perception. Measure: when lighting distribution box USES metal box, want to do antirust anticorrosive treatment. The outlet hole in the box should not be opened by electric welding. One hole should be used for each tube. The hole in the metal box should be well protected before threading. The lines should be arranged in order, and the position of the tubes into the box should be arranged in a reasonable way. Do not let the second board press the tube tightly. The wires in the box should be arranged in a straight line around the box and tied into bundles neatly. No. 8: lighting distribution box (board) has not been inspected Consequences: lighting distribution box (board) approach did not check, often found only after installation: second layer board without special grounding bolt, the protection of ground wire cross section is small, equipped with electrical appliances can open the door to use naked soft copper wire connected to the metal frame is reliable, the wire connected to the instrument is not strong, has anti circle phenomenon, nut not galvanized parts, wire line diameter does not conform to the requirements, not according to the color code identification, no card ark and electrical wiring diagrams, equipment layout, the interval is unreasonable, not set N and PE terminals, etc. Further modification of the delayed schedule also affects the quality. Tabu 9: lighting distribution box (board) installation is not firm, elevation does not meet the requirements, dark when installed, its face plate around the edge is not close to the wall. Consequence: the elevation of lighting distribution box (board) installation does not comply with the provisions, the installation is not firm, the box body is not vertical, dark installation, the edge around the panel is not close to the wall, affecting the use of functions, bad perception. Measures: the elevation shall meet the design requirements. If the design is not specified, the height from the bottom edge of the lighting distribution box to the ground shall be 1.5m. The height from the bottom edge of the lighting distribution board to the ground shall be 1.8m. Installation of lighting distribution box (board) shall be firm, the allowable deviation of installation verticalness shall not be greater than 3mm, when installed in darkness, there shall be no gap around the distribution box, the edge around the panel shall be close to the wall, and the box body shall be coated with anti-corrosion paint where it is in contact with buildings and structures. Tabu 10: lighting distribution box (board) protection line do not get the bit, line diameter does not meet Consequence: the protection wire of the lighting distribution box (board) is not arranged from the terminals, but connected in series by the box frame, the wire diameter is not set according to the requirements, and the protective ground wire is not set for the devices with ultra-safe voltage in the distribution box door, which is easy to cause safety accidents. Measures: according to the requirements of the specification, the lighting distribution box (board) shall be equipped with protection ground wire bus, and the protection ground wire shall be connected on the bus bar. The cross-sectional area of the protective ground wire shall not be less than the cross-sectional area of the maximum lead from the power supply to the electrical appliance to which it belongs. And still should press relevant regulation to choose. The earthing on the distribution box (board) should be firm and good, and must have anti-loose device. Openable doors equipped with electrical equipment exceeding 50V, movable panels shall be reliably connected by bare copper cord to a well-grounded metal frame. The section area of bare copper flexible wire should 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 the pipeline. Protective ground wire contacts between ground wire and electrical appliance.