Construction of electrical installation problems a

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Construction of electrical installation problems and preventive measures

The location and insufficient to make up 10 sub-prime pouring concrete layer. Third, box, box installation problems and control (a) phenomenon, boxes installed elevation inconsistent; box, box opening irregularly; tin deformation; box,[link widoczny dla zalogowanych], box missing plaster positive angle of mouth; situ concrete wall box box shifting; install electrical back box, box dirt not removed. (B) Analysis 1. Stable install wood, metal box, the box when not pre-release with reference to the unity of civil decoration height of horizontal control, especially in situ concrete wall, column tube wiring, no horizontal line can find the template. 2. Metal box, box of electricity, gas welding cutting holes,[link widoczny dla zalogowanych], resulting in box, box deformation, pore size is not the rule. Wooden box, box with a hacksaw sawn rectangular mouth opening, and even knock down a box to help. 3. Civil construction of the template deformation or movement, leaving the box, shift boxes, recessed wall. 4, when the civil construction dust wipe bottoms, box mouth without wiping neat, did not clear the remaining electrical installation in the box, the box of dirt and gray sand. (C) Prevention 1. Stable packing, box to find the elevation, you can refer to a unified civil decoration of the horizontal line preamplifier, usually completed by the horizontal line is the following 50cm horizon. In the concrete wall, column stability, boxes, in addition to the elevation of the light bar on the outside, and civil construction should contact position, with the determination of total elevation theodolite to determine the interior points horizon. A 112-2. Stable place in the concrete wall mounted within the box, box, can in the box, the box behind the addition of small 6am1 steel cap to stabilize the box, box location. 3. Cases, boxes open eyelets, wood products must be of wood drill, iron products, such as no big drill hole when the draw knife can be made with a drill hole to ensure the box, box eyelets uniform 04. Threading, should be clear boxes, ash box, painted two anti-rust paint. Put wire, cover the box with the wiring temporary cover, the cover is less than log or socket surrounding plates, switch plates, but it should be larger than box. Shotcrete to be civil decoration is completed, then remove the lid, installed appliances, lamps, this would ensure the box clean. (D) Engineering Practice 1. Highly inconsistent, boxes, installation of access panels after adjustment exceed the allowable limit, chisel tick boxes, boxes, will be highly tuned. 2. On the box, box missing plaster lip, and with high-grade cement mortar repair and tidy. Fourth, pipe threading problems and control (a) the phenomenon of 1. After threading the first to wear mouth protection, or not wearing mouth protection. Back button or Sikou wire, insulation damage. 2. Phase is not into the switch, and not connected to the screw on the cap of the reed. 3. Threading process, the soil has been painted, and whitewashed walls and roof good. (B) Analysis 1. Put line before threading, pulling out the entire disk line, causing the spiral ring focus, there back button; lead any drag on the ground was stained; operator hands dirty, when you thread rub touch walls, Ceiling, wearing End of line after the box,[link widoczny dla zalogowanych], the box near the dirty. 2. Phase line and neutral wires from the use of the same color,[link widoczny dla zalogowanych], not easy to distinguish, but also in the break, leaving the first mark made when there is no strict, so that the phase and neutral confusion,[link widoczny dla zalogowanych], the results are not into the phase switch, also not connected to the reed screws on the lamp. (C) Preventive measures should be strictly before threading wear mouth protection, no threaded nozzle of plastic that can be worn inside the mouth care; applied when the pay-off pay-off car, put online the entire disk drive cable and spool made mark, let the natural rotation of spool wire, the zero line in black and green uniform, or in the pay-off to make marks on the car spools, to ensure that the phase and make a strict distinction between the zero line. (D) Engineering Practice 1. Multi-strand wire connection, the application galvanized copper crimp connector, try not to do \2. Terminals in the terminal and wire connection should be taken only one, then two for the middle need to add flat washers; allowed three or more connections. 3. Schedule to smooth vertical and horizontal wires, stripping the thread length of the head should be kept in the same wire into the terminal after the conductor should not be exposed; copper connectors and wire and wire connections use the same color insulation tape dressing. 4. Purchase of materials required by field staff need to meet a variety of colors with the wire. 5. Clearly distinguish the phase line construction workers, the zero line (N line), ground fault protection line (PE line) distinction between the role of subject matter and color, that team a yellow phase, B phase of a green, C phase a red; single phase is preferred when the general red; zero line (N line) applications light blue or blue; ground protection line (Pc class) must be of yellow and green wires.