I, project introduction
1, low-voltage distribution box using 380/220V, three-phase wiring system TN-C-S system, distribution in addition to the three-phase four-pole and single-phase two-pole switches, other switches are controlled by the phase line, the PE line must not pass through the leakage The PE wire shall not pass through the zero sequence current transformer coil of the protector.
2, construction conditions: the construction site has reached the "three passes and one leveling" conditions, materials, machinery according to the image of civil construction progress and electrical installation project progress plan in batches into the field, the staff organized on time into the field.
3, the electrical installation part of the project includes: lighting, electricity, telephone, microcomputer, fire, lightning protection and grounding, total equipotential connection system, *** four projects.
Two, quality objectives
1, all the use of all the works within the scope of the contract function in line with the design or change the requirements of the drawings, the installation works to achieve excellent standards;
2, all hidden works must be accepted by the representative of the Party A and the supervisory department;
3, the electrical installation project warranty period of 2 years. Construction order and flow: generally should comply with the "first underground, after the ground; first civil engineering, after the equipment; first pipe laying, after the installation" order, with civil engineering interspersed construction. Flow division: concealed piping installation; switch and socket box positioning; pipe threading; switches, sockets, lamps and lanterns installation; system function test; power supply operation. Division of construction section: electrical piping, wiring, lighting fixtures and switches and sockets, divided by floor, buried and reserved with the progress of civil engineering division. Overall construction section division: φ1 ~ φ10 axis for the first construction section; φ11 ~ φ21 axis for the second construction section; organization of cross-flow operation, interspersed construction, to ensure construction progress;
Three, construction methods
(a) electrical piping works
This project has two kinds of electrical piping pipe: one is PVC pipe and the other one is electroplated pipe. PVC pipe is mainly used for some equipment piping in cast-in-place boards and walls.
1, PVC pipe construction process: positioning line; processing pipe bending; stabilize the box box; dark pipe laying; sweeping pipe threading.
1.1 pipe positioning according to the design drawings, combined with the project wallboard thickness, to determine the exact location of the pipeline, box and buried parts, rows and columns of boxes and boxes hanging crosses straight to determine the position.
1.2 pipe laying
1.2.1 cast-in-place concrete slab pipe laying: pipe laying between the two layers of reinforcing bars, every 1 meters from the box within 0.15 meters of the pipe and reinforcing bars within 0.15 meters of the tie wire tied firmly, while every 1.0 meters with the diameter of 8mm reinforcing bars bench will be fixed pipe bracket to ensure that the pipe is in the center of the plate, not due to changes in the pouring of concrete.
1.2.2 Block wall pipe laying: first cut the trench with a cutter, and then pick the groove, the width and depth of the groove than the pipe outer diameter should be larger than 5-10mm, laying the pipe at intervals of about 0.5 meters, the pipe will be fixed with steel nails, and finally fixed protection with the intensity level of not less than M10 cement mortar plaster, thickness of not less than 15mm.
1.2.3 Pipe laying requirements: Pipe connection using shaped external connection, counterparts placed in the center of the shaped external connection, adhesive bonding at the bonding place using adhesive bonding firm, the port with a waterproof tape wrapped around the seal, to prevent falling into the debris. When picking the groove to lay the pipe, do not allow to cut the steel bar.
1.3 box fixed:
1.3.1 brick wall box buried steadily: according to the box location hole, hole watering wet, with M10 cement mortar buried box. Pipe into the box using screw joints and pipe fixed firmly, screw joints and pipe using adhesive bonding.
1.3.2 cast-in-place concrete fixed box: according to the design position, in the box box to bury the position of the box or set of boxes reserved. Sets of boxes than the actual box, box slightly larger than 3-10CM. switch box, socket box in the installation of 150 × 100 × 50mm plastic foam board, and will be fixed in the box box on the rebar, and close to the template.
1.4 Sweeping pipe through the belt line: pipe laying is completed, sweep the pipe in a timely manner to remove the trash, debris and water in the pipe.
1.5 quality requirements: the oxygen index of all pipes ≥ 32. Pipes are fixed firmly, the box is buried accurately, the pipeline into the box must be fixed using screw joints, the bending radius of the dark pipeline ≥ 6D, the curvature of the bend at the bend ≤ 0.1D (D for the outside diameter of the PVC pipe). After the pipe laying is completed, it must be reported to the construction unit, supervision unit, construction unit acceptance before concealment, and timely handling of concealment acceptance procedures.
2.1 Concealed pipe laying requirements:
2.1.1 Pipe protection layer ≥ 15mm, the fire part of ≥ 30mm.
2.1.2 into the distribution box of the wire piping should be neatly arranged, the mouth of the pipe above the box surface of not less than 50mm.
2.2 Prefabrication processing: according to the design drawings, processing of all kinds of box, box, pipe bending, pipe diameter 20mm or less using hand-operated simmering bender simmering. Pipe diameter 25mm or more using hydraulic simmering bender. Pipe diameter of 25mm or more can also be used to fill the pipe sand hot simmering method.
2.3 pipe cutting: small pipe diameter can be used to cut the pipe or hacksaw section of the pipe, large pipe diameter with a grinding wheel to cut the pipe. Requirements for smooth and flat fracture.
2.4 tube lasso: tube into the box box, with the root of the mother and tube lasso connected firmly, can use the lasso machine or manual strand board lasso.
2.5 Determination of box location: according to the design requirements, to determine the location of the box, to the civil engineering pop-up horizontal line as a reference, leveling, line drop to find the right, marking out the actual size of the box location.
2.6 Stabilization of the box: stabilization of the box requires full mortar, flat and firm, the coordinates are correct. When the thickness of the bottom of the box box from the wall surface is less than 3cm, it is necessary to add a steel wire mesh to fix it, and then plaster to prevent air cracks.
2.7 pipeline connection:
2.7.1 using casing connection, casing length of 1.5-3 times the outer diameter of the connecting pipe. Counterparts are placed in the center of the casing.
2.7.2 Bevel welding: steel pipes with a diameter of 80mm or more are bevel welded.
2.7.3 tube into the box box connection: box box hole neatly, and tube diameter coincides with a tube hole, tube into the box box using lock nut fixing, expose the lock nut snap for 2-4 buckles. Switch box, outlet box, the grounding protection line connected to the box box protection ground terminal.
2.8 concealed pipe laying: pipe laying method with the PVC pipe, need to pay attention to the following points: in order to control the box box elevation and leveling, the first tube will be about 200mm high, and then the box box stabilized, and then connected to the short pipe. Short pipes such as boxes, boxes can not be casing, with a cross grounding wire across the solid. When the pipe is led up to the ceiling, the upper end of the pipe is simmered into a 90-degree bend straight into the ceiling. Concrete wall piping, box box with reserved sets of boxes, boxes of practices, using 150 × 100 × 50mm plastic foam board, pipe into the box box simmering into a light fork bend, every 1 meter or so with zigzag wire will be tied to the pipe and reinforcing steel.
2.9 ground welding: pipe to do the whole ground connection, pipe and box box connection are required to do across the ground line welding, across the ground line at both ends of the welding surface is not less than 6 times the cross section of the ground line. Welding uniformity and firmness, welding at the flux skin cleaned up, the internal pipeline anti-corrosion treatment using anti-corrosion paint. Snap: galvanized steel pipe or flexible metal hose, with a special grounding wire snap.
2.10 quality standards:
2.10.1 Insulation resistance between wires and wires to ground must be greater than 0.5MΩ; thin-walled steel pipe is strictly prohibited fusion welding connection.
2.10.2 Connection is tight and firm, smooth mouth, complete mouth protection, pipe protection layer is greater than 15mm;
2.10.3 Box box location is correct, fixed and reliable, pipe into the box box straight. Fixed with a lock nut pipe mouth pipe exposed to the threads of the lock nut 2-4 buckles.
2.10.4 dark piping pipe minimum bending radius is greater than or equal to 6D, bending at the bend flatness is less than or equal to 0.1D.
(B) electrical wiring project
The project used wire specifications BV-2.5mm2, BV-4mm2 and other specifications, mainly used for indoor lighting, sockets and other circuits, circuits should be set up for grounding protection line.
1, process: selection of wire; sweeping tube; wearing tape line; release and disconnect; tube mouth with mouth guard; wire connection; line insulation shaking test.
2, select wire: according to the design drawings, drawing review, design changes and other information to select the appropriate wire diameter. Phase line can be yellow, green, red three colors; zero line with light blue, grounding protection line with two-color line.
3, pipe cleaning: pull back and forth with a cloth to clean up the debris in the pipe cavity.
4, wear tape line: the use of steel wire as a tape line, check whether the pipeline is smooth, to determine the direction of the pipeline and the location of the box box.
5, put the line and break the line.
5.1 Release the line: before releasing the line according to the construction drawings, the specifications of the wire, the type of check.
5.2 disconnection: junction box, socket box, switch box and light box wire in the reserved length of 15cm; distribution box wire reserved length of 1/2 of the perimeter of the distribution box; out of the house wire reserved length of 1.5 meters.
6, conductor and tape line tie.
6.1 When the number of wires is small, the core will be inserted directly into the coil with the line folded back to compact, tie firmly.
6.2 When the number of wires is large and the cross-section is large, the cores are arranged diagonally staggered on the tape line.
7, pipe threading.
7.1 threading check whether the mouth guard is complete, the omission of timely replacement.
7.2 pipeline longer, more turns, can be blown into the cavity of the appropriate amount of talcum powder.
7.3 different circuits, different voltages and AC and DC wires, shall not be threaded into the same tube. 8, wire connection: wire connection joints can not increase the resistance value, can not reduce the insulation strength, the stressed wire can not reduce the original mechanical strength.
8.1 single-core wire using winding method of joints.
8.2 junction box wire connection, crimp cap crimping, according to the design of the wire diameter of different selection of different crimp cap.
8.3 wire diameter of 10mm2 or more when connecting the casing crimping.
8.4 multi-stranded copper wire brushed with tin, crimped using terminals.
8.5 single-core wire and equipment, switches, sockets connection, the use of pinhole type terminal block connection.
8.6 Diameter 10mm2 or more wire connection using the terminal nose crimping.
9, wire welding: tin soldering.
10, line insulation resistance test: lighting line insulation resistance shaking test using 500V, range 0-500MΩ megohmmeter. Shaking speed at 120r/min, can take a minute reading. Mainly measure the insulation resistance between the wire and wire and ground.
11, wire wrapping: crimp cap crimping.
12, quality requirements.
12.1 wire specifications, models, etc. in line with the design requirements and national standards; lighting line insulation resistance is greater than 0.5MΩ, power line lighting insulation resistance value is greater than 1.0MΩ.
12.2 box box is clean and free of debris, the mouth guard, wire casing is complete. Wire in the tube without joints, wires are neatly arranged, and leave an appropriate margin; wire connection is firm, tightly wrapped, good insulation, does not hurt the core.
(C) distribution box installation
1, distribution box installation requirements.
1.1 Distribution box bottom 1.5 meters from the ground, allowable deviation 5mm.
1.2 Distribution box good anticorrosion, grounding protection line position is correct, complete.
1.3 distribution box wiring neatly, and tied into bundles.
1.4 distribution box labeled circuit name and purpose.
1.5 Into the distribution box main line, A, B, C are marked with yellow, green, red, neutral line with light blue, ground protection line with two colors;
1.6 distribution box board installation is firm, flat, vertical deviation does not exceed 3mm, perimeter and the wall without gap.
2, line positioning: according to the design requirements to find out the location of the distribution box, according to the dimensions of its appearance line positioning, with the construction of civil engineering structure to install a good set of boxes and reserved holes.
3, distribution box customization: distribution box customization, according to the construction unit to determine the manufacturer, and installation companies, fire installation companies on the distribution box components of special requirements, combined with the design drawings, and in a timely manner to the manufacturer to provide detailed drawings of the distribution box system, and mark the box for the installation of open or concealed.
4, distribution box plate fixed:
4.1 Expansion bolts are used to fix the brightly installed box; concealed distribution box, the first box to find a good elevation and size, the box will be fixed, fill the periphery with cement mortar, and wipe neat and smooth;
4.2 distribution box all electrical installation is completed, the line with a 500V megohmmeter insulation shaking test, the main measurement of the inter-phase, Relative to the neutral line, relative to the protection line and the neutral line on the protection line between the insulation resistance. The test is completed to make a good record, technical data archives.
5, quality requirements:
5.1 Low-voltage distribution box protective grounding measures must comply with the construction acceptance specification.
5.2 box, disk installation location is correct, the opening is appropriate, neatly cut, complete sinks, protective grounding line is obvious, set up in accordance with the provisions of the construction specification.
5.3 wire and appliance connection is firm and tight, not hurt the core, pressure plate connection is not loose.
5.4 protective grounding wire connection is tight, section selection is correct, reasonable direction, accurate color coding.
5.5 Distribution box wiring should be neatly arranged, tied into bundles, in the active parts should be fixed at both ends, the disk leading and the introduction of the line should be left with an appropriate margin for maintenance.
5.6 Vertical installation of the gate and fuse and other electrical appliances on the upper end of the power supply, the lower end of the load.
5.7 Zero system in the zero line, should be made in the box to repeat the grounding.
5.8 distribution panel apparatus, instrumentation should be fixed firmly, flat, evenly spaced, no loose copper terminals, open and close flexible, complete parts.
(D) lamps and lanterns installation
1, process: check the lamps and lanterns; assembly lamps and lanterns; installation lamps and lanterns; power test run
2, check the lamps and lanterns:
2.1 check the lamps and lanterns with the installation of the place is consistent.
2.2 check whether the lamp wiring in accordance with the provisions of the construction specification, multi-stranded flexible wire whether to brush the tin, screw lamp port phase line is pressed on the wick post; 2.3 check whether the special lamps and lanterns in line with the design requirements.
3, lamps and lanterns assembly: some lamps and lanterns for easy transportation, need to be reassembled, should refer to the detailed instructions or design drawings in a timely manner to assemble the lamps and lanterns;
4, lamps and lanterns installation:
4.1 Ceiling lamps installation: according to the ceiling lamps lamp base fixing position, drilling holes in the top plate, into the plastic tube, and then will be the lamp wire from the lamp base outlet, with self-tapping wire will be fixed in the plastic tube, the base will be fixed in the plastic tube, with the self-tapping wire will be fixed in the base. Use self-tapping wire to fix the base on the plastic expansion tube, and then connect the wire to the terminal inside the lamp.
4.2 Fluorescent lamp installation: according to the design drawings to determine the location of the fluorescent lamp, advance positioning line, in order to prepare for the decoration of the holes reserved. The hole size should be 10㎜ larger than the size of the lamps and lanterns, and when installing, use self-tapping wire to fix it on the reinforcement keel around, after the light box is fixed, press the power cord into the terminal board inside the light box, fix the reflector of the lamps and lanterns on the light box, and adjust the light box to be straight, and then finally install the lamps and electrify the lamps and lanterns for the test. The light box should be level with the surrounding finish, no gap.
5, energized test run: lamps and lanterns, distribution box installation is completed, the branch circuit insulation resistance test is qualified, energized test run. Energized inspection tour to see whether the lamps and lanterns control is flexible and reliable. Switch and lamps control order is relative to each other.
6, quality requirements:
6.1 lamps and lanterns specifications, models must comply with the design requirements and construction specifications, lamps and lanterns grounding protection line complete.
6.2 lamps and lanterns are installed firmly and correctly, the position is correct, rows of lamps and lanterns are neatly arranged.
6.3 wire into the lamps and lanterns do not hurt the core, in the same crimp terminal wire not more than two.
6.4 rows of lamps and lanterns are allowed to deviate from 5mm.
6.5 24 hours of operation, every 8 hours to check, the voltage should be normal, the power equipment, lamps and lanterns operate normally, the line, the fuse is not overheating phenomenon, the automatic switch is not incorrectly activated phenomenon.
(E) switch, socket installation
1, process: cleanup; wiring; installation
1.1 cleanup: with a burin will be removed from the box debris, and then use a wet cloth to wipe the box of dust;
1.2 wiring: switch cut off the phase line, cut off the location of the same; socket slot plug type, facing the socket, the left side to connect to the center, the right side to connect to the phase line, and the upper side to connect to the ground protection line;
1.2 wiring: switch cut off phase line, cut off position is consistent; outlet slot plug type, facing the outlet, left to connect to the center, right to connect to phase line, and the upper side to connect to the ground protection line. Grounding protection wire;
1.3 Installation of switches and sockets:
1.3.1 First, the box will be thrown out of the wire to leave the length of the repair, the wire will be coiled in a clockwise direction in the switch, socket box.
1.3.2 Switches and sockets are concealed. The switch is 1.3 meters from the ground, the socket is 0.3 meters from the ground, the switch is 150-200mm from the doorway, the deviation of the installation in the same place shall not be more than 5mm, and the height difference of the installation of rows of lamps and lanterns shall not be more than 2mm.
1.3.3 According to the requirements of the wiring, the wires thrown out of the box are connected with the panels of switches and sockets, and the switches and sockets are pushed into the box to the box eyes.
2, quality requirements:
2.1 switches and sockets wired correctly, in accordance with the provisions of the construction acceptance specification.
2.2 switch, socket location is correct, the box is clean and free of debris, the cover plate is tight to the surface of the building. Switch cut off the phase line, socket grounding protection line is laid separately.
(F) lightning protection and grounding device construction
The project design requirements from the first floor, every three floors using structural ring beams within the horizontal reinforcement and columns in the lead wire welded into an equalized pressure ring. Roof lightning net made of φ10 galvanized round steel, bracket made of 20 × 3 galvanized flat steel, horizontal bracket spacing of 1-1.5 m, and the division is uniform, corner bracket and corner spacing is not more than 0.5 m, bracket height of 100-150 mm. needle (net) must be lap welding, double-sided lap welding length of 6d.
1, process: grounding body; grounding Trunking; lead wire concealed; equalizing ring; lightning net; lightning rod.
2, grounding body installation: according to design requirements, along the foundation around the foundation beam laying 40 × 4 galvanized flat steel. Galvanized flat steel welding brush asphalt paint anticorrosion, plated core flat steel and out of the building is connected to the metal pipe.
3, grounding trunk: in the strong well to set up a protective grounding trunk, using 40 × 4 galvanized flat steel laying each layer of wiring holes are set up, and connected to the equalizing ring with the lead flat steel. Pipe wells are laid with the equalizing ring. Pipe well metal pipe and plated core flat steel grounding body welding.
4, lightning lead concealed: the project lightning lead using structural columns within the main bar. The use of two bars at each place, the specific layout details see attached. As the project steel connection using straight ribbed connection, in the ribbed joints with 400mm long diameter 14 steel bar and the main bar across the welding, welding is completed, and promptly reported to the construction unit, the supervision unit acceptance, qualified before concealment.
5, lightning net installation: the project roof lightning net using Φ8 galvanized steel pipe production, bracket using 20 × 3 galvanized flat steel production, horizontal bracket spacing of 1-1.5 m, and the division of uniform, corner bracket and corner spacing is not more than 0.5 m, bracket height of 100-150 mm. 5.1 Bracket installation:
5.1.1 Bracket adopts flat steel bracket, buried depth is not less than 80mm, bracket installation should be firm, full of mortar, horizontal and vertical.
5.1.2 with a hammer and brazier for picking holes, hole size inside and outside the same, the holes are wet with water and then use mortar embedded bracket, bracket installation should be a straight line.
5.2 lightning net installation:
5.2.1 Requirements: lightning line straight, firm, every 2 meters of straightness is 3 ‰, lightning net bends not less than 130 degrees.
5.2.2 will be galvanized steel pipe according to the structure of geometric dimensions of the material, bending, transported to the roof laying, card fixed, welded into one, with the lead wire connected to the firm. Welding to do anti-corrosion treatment, and finally the lightning net brush silver powder paint 2 degrees.
6, quality requirements:
6.1 material quality in accordance with the design requirements, grounding device grounding resistance must meet the design requirements, grounding wire is strictly prohibited series connection;
6.2 grounding body installation: the location of the correct, firmly connected, the grounding body buried depth of not less than 0.6 meters;
6.2.1 Requirements: lightning line straight, firm, every 2 meters straight Degree of 3 ‰, lightning net bend not less than 130 degrees.
6.2.2 will be galvanized steel pipe according to the structure of geometric dimensions of the material, bending, transported to the roof laying, card fixed, welded into one, with the lead wire connected to the firm. Welding to do anti-corrosion treatment, and finally the lightning net brush silver powder paint 2 degrees.
7, quality requirements:
7.1 material quality in accordance with the design requirements, grounding device grounding resistance must meet the design requirements, grounding wire is strictly prohibited series connection;
7.2 grounding body installation: the location of the correct, firmly connected, the grounding body buried depth of not less than 0.6 meters;
7.3 lightning net straight, straight. Quality and Safety Technical Measures
I. Quality Assurance Measures
1. The following standards are strictly enforced in the construction of all professional trades of this project:
A, current construction and acceptance norms of installation works (national standards), professional construction drawings and standard drawings;
B, operation procedures of installation works construction;
C, quality of building installation works Evaluation standards.
2, the construction personnel must be carefully familiar with the construction drawings (including drawings, review and change) and civil engineering structure, between the various professions and with the civil construction, a variety of pipelines across the cross-over, elevation, relative position and spacing should be considered comprehensively, so as to do in advance to have a clear idea of what is found in a timely manner to solve the problem of negotiation.
3, the establishment of equipment procurement, transportation, handover and acceptance system, the quality of the gate, for poor quality and unqualified products are not allowed to acceptance into the warehouse.
4, to improve the quality of self-inspection, mutual inspection, hold the quality gate, the establishment of regular and irregular inspection system, for hidden works in the hidden before the project must be carefully inspected and approved by the supervisor, the A party quality inspection personnel, and make records.
5, the construction process should be filled out in a timely manner and properly preserved a variety of archival information, and firmly put an end to the completion of the project to engage in the practice of recall.
6, each professional reserved holes and buried pipes, should be reserved with the civil engineering, buried and there should be a person to check the records marked on the construction drawings to prevent omissions and errors.
7, for the installation of finished products such as lamps and lanterns, lighting equipment, cables, switches, sockets and other equipment, according to the specific circumstances to strengthen the protection of finished products, for the important inconvenience of adopting protective measures, to take special duty guards, to prevent touching the loss of bad, missing pieces and catastrophic losses.
8, all the lamps and lanterns should be pre-assembled and installed through the test light, lamps and lanterns in the assembly of the test light after the second handling, there should be anti-vibration protection.
9, copper joints using resistance welding, not allowed to take the mechanical connection, resistance welding welders should be trained before welding.
10, into the brick wall of the wire pipe should be closely with the civil construction, in the brick wall masonry is completed, to be after its solidification period, the need to play the slot laying wire pipe, in the slotting wall, according to the position of the equipment pop-up line, be sure to straighten, allow deviation of 25 ㎜, the depth of the pipe laying should be recessed into the brick surface of the 15mm, in order to ensure that the construction of the stucco layer of the firm.
11, with the cast-in-place concrete beams, columns, floor slabs and slabs within the wall of the wire pipe, be sure to lay the pipe in the bottom tendon or side tendon above, not directly laid on the template, pay special attention to the floor into the beams of the curved, be sure to ensure that the bending radius of the pipe is not less than 10 times the outside diameter of the pipe, will be used to cushion up the pipe with the horse stool to ensure that no leakage of the pipe phenomenon after the demolding.
12, piping box (box) should meet the following requirements, buried in the shear wall, columns on the switch, socket, wire box should ensure that its coordinates, the accuracy of the elevation, the need to support the mold before the first pre-buried 150 × 100 × 50 ㎜ plastic foam board, to be dismantled after the removal of the mold will be the plastic foam board, and clean up the pipeline, to be the civil construction of the interior wall after the completion of the plastering, the design of the design elevation, the coordinates of buried switch box, the switch box buried first with the design elevation, the coordinates, the switch box buried first with the mold, and the design of the design of the switch box, the design of the switch box buried with the mold. When burying the switch box, first use a ruler to measure the elevation of the coordinates of the point, not less than two points per wall, pop-up vertical and horizontal control lines, according to the line buried switch, socket box, to ensure the accuracy of its coordinates, elevation and flatness.
13, box (box) buried its coordinates should be consistent with the design requirements and construction specifications, the dark switch from the door frame 150-200 ㎜, the coordinates in the same building should be consistent. The mutual elevation difference in the same place is not more than 5mm.
14. The box should not be on the cement or tile line of the building so as not to affect the beauty.
15, rows of socket coordinates centerline, the deviation should not be more than 5mm.
16, box box holes should be used on the original holes, such as the need to open the hole, should be mechanically opened, prohibited the use of welding holes.
17, tube and box fixing method, should meet the following requirements:
A, tube into the front box should be straight, the length of the box is less than 5mm.
B, the wire pipe should be fixed with lock nut whether it is open or concealed.
C, ceiling piping should be set up separately, the suspension card shall not be directly laid in the civil construction for the ceiling of light steel keel, also shall not be directly located in other pipelines, piping from the top height should be greater than 200mm.
18, in order to ensure that during the construction of the main body, cast-in-place slabs on the reserved masonry filler piping will not be damaged, in the casting of the slab casting, i.e., with the diameter of 10mm reinforcing bars before Stirrups will be left PVC pipe tied fixed, steel stirrups and cast-in-place plate reinforcing steel tied fixed, stirrups 100mm high, 150mm wide.
19, the use of 500V megohmmeter, circuit by circuit measurement of its conductor and conductor to ground between the insulation resistance value must be greater than 0.5 megohm.
20, according to each distribution box to record the insulation resistance measurement between the wire and wire to ground.
21, the area of the conductor in the tube (including the outer layer) should not exceed the tube cross-sectional area of 40.
22, the inner wall of the wire tube should be clean and free of debris and water, the wire should not be joints in the tube.
23, where not into the box box of vertical pipe mouth, wire threaded pipe mouth should be sealed to prevent debris and water and harmful gases into the tube.
24, in the wire to make electrical connections, must first cut off the insulation, and then connect, and then add welding, wrapping should be in line with the design requirements and specifications, after checking the insulation shake test.
25, all wires and boxes and boxes and distribution box shell should be connected to ground (zero). Measure its grounding resistance is not greater than 4 ohms, and make a good test record. Lighting circuit insulation resistance greater than 0.5 megohm.
Two, to ensure safety measures
1, in strict accordance with the "safety regulations for construction and installation works" construction.
2, the construction organization into the field of production safety education, the team set up a full-time safety officer, the establishment of a safety duty system, adhere to the pre-shift meeting, in the layout of the day's production tasks at the same time, put forward safety precautions.
3, into the site wear a good helmet, work at height must be chained to the safety belt, ladder should be non-slip measures.
4, the construction of electricity using single-phase three-wire system and three-phase five-wire power supply, electrified work should wear insulated boots, electric lines should be set up for daily inspection and maintenance, and found that the hidden trouble in a timely manner.
5, strengthen the site fire prevention: non-work shall not use open flame and the use of electric stoves, welding, should be checked in a timely manner, shall not leave hidden dangers.
6, it is strictly prohibited in the pipeline wells throw bricks, corners and garbage debris. Well construction should be set up on all levels of protective railings, hanging "manhole operation, littering is strictly prohibited," the warning signs, construction surface, the upper part of the measures taken to isolate.
7, it is strictly prohibited to work after drinking, are not allowed to wear slippers, high heels, barefoot into the scene.
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