(1) Installation process instructions for complete distribution cabinets: Electrical cabinets in the basement should be installed on steel brackets to prevent condensation on the wall from entering the box. Generally, 10# channel steel is placed vertically under the cabinet. The allowable deviation of the foundation steel is: the straightness and horizontality per meter are 1mm, the total length is 5mm, and the total length is not parallelism is 5mm. And galvanized hexagon bolts M10×25 need to be welded on the inside of the channel steel for grounding. If there are cables entering and exiting, a foundation pit must be reserved at the bottom of the cabinet to meet the bending radius requirements of the cable. (2) Instructions for the distribution box open installation process: When the plastering of the wall cylinder at the ground installation site is not completed, first use expansion bolts to fix the angle steel bracket after the box, and then use galvanized bolts to fix the box on the angle steel bracket. When several open-pack boxes are parallel, the installation height of the cabinet shall be determined according to the principle that the maximum top elevation of the box shall not exceed 2.3m and the top or bottom of all boxes shall be flat. The allowable deviation of the verticality of the installation of cabinets, screens, tables, boxes and disks is 1.5‰, the indirect joints should not be greater than 2mm, and the deviation of the plate surface in a row should not be greater than 5mm.
(3) Distribution box concealing process instructions: determine the opening position and open the holes; fix the four corners of the concealed box to ensure that the height of the concealed box meets the requirements and is flat with the wall; if only plastering can be plastered behind the box, the general contractor must hang a steel wire mesh behind the box and then plaster; if there are several conduits entering the box side by side, steel wire mesh should also be plastered at the pipe groove. When installing on a lightweight partition wall, determine the opening position and open the hole; after decorating the light steel keel , fix the concealed box body to the light steel keel with pulling rivets or self-tapping screws; the concealed electric box cover is close to the wall, and the box (disk) coating is complete. (4) Installation process instructions on hollow block walls and aerated concrete block walls: After the wall is wiped with dust, use a galvanized screw to fix the four corners of the box to the hollow core wall.
(5) Instructions for the boxing process: The box uses hole opener holes, one hole and one set, and the diameter of the pipe should match the knock-off hole of the box (box). If the knock-off hole is large and the pipe diameter is small, you can use iron washer to be tightly padded or mortar and gypsum to make up flush. The holes must not be exposed. Connect the pipe into the cabinet and lock the pipe end. When steel pipes enter the cabinet, a 4.2mm hole should be reserved near the steel pipe for grounding wire to enter the box. The circuit signs in the box must be correct, clear and complete. (6) Description of the bridge tray boxing process: The cable tray is used for connecting the foot outside the box. According to the location of the connected bridge tray and the arrangement of components in the cabinet, the size and spacing of the holes match the guard port, and 1 cable and 1 hole. When mineral cables or single-core plastic insulated cables enter the cabinet, each inlet hole between a set of cables is connected to each other with a 1-2mm slot. Lead the end of the cable tray to the cabinet floor with BVR-4.
(7) In-box wiring process description: The distribution box requires clear markings, PE rows, N rows, and each circuit sign is accurate, the cables and wires are arranged neatly and orderly, and the inlet holes are tightly sealed. 2. Electrical equipment test and trial operation (1) Low-voltage electrical equipment test content Process description: The test items of low-voltage electrical appliances should include the following contents: a. Measuring the insulation resistance of low-voltage electrical appliances together with the connected cables and secondary circuits: motor , electric heater and electric actuator should be greater than 0.5MΩ. b. Verification of the voltage coil action value: The suction voltage of coil should not be greater than 85% of the rated voltage, and the release voltage should not be less than 5% of the rated voltage; the closing coil that works for a short time should be within the range of 85% to 110% of the rated voltage, and the split-excitation coil should be reliable in the range of 75% to 110% of the rated voltage. c. Check the operation status of low-voltage electrical appliances; d. The tripping device used in low-voltage electrical appliances should be adjusted according to the usage requirements; measure the DC resistance of resistors and rheostat; e. AC voltage withstand test of low-voltage electrical appliances together with the connected cables and secondary circuits: When the insulation resistance value is greater than 10MΩ, use a 2500V megohmmeter to measure for 1 minute, and there should be no flash breakdown phenomenon; when the insulation resistance value is 1 to 10MΩ, perform a 1000V AC power frequency withstand voltage test, and the time is 1min, there should be no flash breakdown phenomenon.Electronic components in the circuits of cabinets, screens, tables, boxes, and disks should not participate in AC power frequency voltage withstand test; circuits below 48V may not undergo AC power frequency voltage withstand test. (2) Process description of low-voltage electrical equipment test and trial operation procedure: low-voltage electrical power equipment test and trial operation should be carried out according to the following procedures: a. The equipment can be connected to ground (PE) or zero (PEN) close to exposed conductor, and the test can only be carried out after inspection; b. The AC power frequency withstand voltage test and protection device of the power complete set of power distribution (control) cabinets, screens, tables, boxes, and disks can only be turned on if the power is passed; c. The control loop simulated action test is qualified, the wheel is car or manual operation, the electrical part and the rotation or movement of the mechanical part can only be coordinated and consistent after inspection and confirmation. d. The motor should be powered on to check whether there are abnormalities in steering and mechanical rotation; the motor that can be run for no-load trial is generally 2 hours, record the no-load current, and check the temperature rise of the fuselage and bearings. e. AC motor can start the number and interval time in the no-load state (no feeding) of the AC motor should meet the requirements of the product technical conditions; if there is no requirement, the time interval for starting twice continuously should not be less than 5 minutes, and the motor should be cooled to normal temperature after the motor is started again. When operating in the no-load state (no-feeding) state, current, voltage, temperature, operating time and other relevant data should be recorded, and should comply with the no-load state operation (no-feeding) requirements of construction equipment or process equipment. 3. Installation of busbar trough
(1) Busbar trough installation process description: Before connecting each section of the busbar group of the closed and plug-in busbar, use 1KV insulation shaking meter to measure the insulation resistance. The insulation resistance value is greater than 20MΩ before the group is installed. The height of the horizontal busbar shall not be less than 2.2m, the spacing between fixed points of the horizontal straight line segment shall not be greater than 3m, 0.5m at the bend, and 0.5m from the connection or end of the box (disk). When the enclosed busbar is laid with a length of more than 40m and spans the expansion joint or settlement joint of the building, it should be equipped with expansion joints. The busbar bracket and the enclosed and plug-in busbar shell grounding (PE) or zeroing (PEN) are connected, and the busbar insulation resistance test and AC power frequency withstand voltage test are qualified before the busbar can be powered on. (2) Description of vertical installation process of bus trough: When installing the bus trough horizontally, the holes left at the wall should be 50mm wider and taller than the bus trough, and each side of the holes passing through the floor slab is 100mm larger than the size of the bus trough. The busbar trough is used to construct a waterproof line with 50mm face tiles through the floor hole. The back is 20-30mm away from the bridge tray and bus trough. fireproof mud is embedded around the bridge tray and bus trough. When the floor height is within 4.5m, a vertically installed bus trough should be installed on each floor slab, and a bracket should be installed on the top of the plug-in box with a bracket of 300mm; if the floor height exceeds 4.5m, a bracket should be added, and the connector of the bus should not be located in the floor slab. 4. Bridge frame installation
(1) Bridge frame bracket installation process description: Fixing points should be set within 500mm of the tee of the inlet and exit junction box, box, cabinet, corner, corner, turn and deformation joint and T-connector. A bracket should be added to the center of the horizontal elbow of the bridge tray 800 or above. The distance between the bracket and the hanger should not be less than 150-200mm from the upper floor slab, and 15-20mm from the bottom of the beam; the height from the ground should not be less than 100-150mm. The brackets at all tees and horizontal elbows should be fixed bracket . When the aluminum alloy bridge is fixed with the steel bracket, add 3mm thick rubber pad between the bridge tray and the bracket, and apply a long grounding busbar bolt and the bridge connecting plate bolts and the bridge tray connection plate bolts are fixed and tightened without any omissions. The nut is located outside the bridge tray. (2) Bridge frame connection process description: The bridge frame joints should be tight and straight, and the gaps should be maintained within 1mm. The bridge branch should adopt the angle of the guide to ensure that the bending radius of the cable meets the specifications. The vertical bridge tray should be installed in the bridge tray for cable tying, and the binding distance should not be greater than 1000mm. The end of the cable tray should be equipped with a terminal seal. Protective measures should be taken when laying the bridge tray at the interface below the pipeline: a 100mm-long bridge cover is covered at the two interfaces of the bridge shell of this section, and the covered cover and the original cover are sealed with plastic steel soil to avoid water accumulation. If the bridge body is used as the grounding trunk, the ends of each layer of bridge should be connected in parallel with soft copper wires of no less than 16mm² and connected with the main grounding trunk.
(3) Process description of bridge compensation device: The length of the linear section steel cable tray exceeds 30m and the length of the aluminum alloy or fiberglass cable tray exceeds 15m is connected with a telescopic connection plate; when the bridge passes through the deformation joint (extending joint, settlement joint) of the building, the bridge itself should be disconnected, leaving a 50mm wide gap. A "extending joint plate" is installed on both sides of the bridge (the bolt fixing holes are long strips), and do not tighten with the connecting bolts on the side of the bridge to adapt to the longitudinal expansion and contraction of the pallet ladder; and a ground connection is made with a jumper with a cross-sectional area of no less than 16mm2. (4) Bridge frame fireproof sealing process description: A 20mm gap should be left when the bridge frame passes through the fireproof partition wall. The gap between the cables in the bridge tray and the uppermost cable and the bridge cover plate are filled with fireproof mud. The gap between the bridge body and the structure is first filled with mud, and then the outer surface is closed with fireproof board . The bridge frame passes through the longitudinal fireproof zone. When the structure leaves holes, the holes are required to be 100mm longer than the bridge frame and 50mm wider. If the building height is less than 100m, fire-proof separation is made on the floor slabs for every 3 floors; if the building height is ≥100m, fire-proof separation is made on the floor slabs for every floor. Install the vertical shaft bridge tray, and drill a φ12 hole on each side of the floor about 50mm from the bridge cover plate, and the hole is required to be 100mm lower than the ground of this floor; and civil engineering will also make a 50mm-100mm wide and 100mm high water barrier line at the floor slab of the bridge.
(5) Description of the connection process between the bridge tray and the conduit: The connection between the bridge tray and the conduit should be fixed by a locking mother; except for connecting equipment and lamps, metal or non-metal flexible conduits shall not be used. Special joints should be used when connecting metal hoses to the bridge tray. The conduit uses galvanized steel pipe or welded steel pipe . The grounding and jump between the conduit and the bridge frame according to the requirements of the conduit grounding. (6) Description of cable laying process in the bridge: Only when the insulation test is passed before the cable is laid; the cable should be laid one by one, sorted and tied one by one before laying; a fixed point should be placed every 2m of the cable laid inclined than 45°; a cable entering and exiting the cable trenches, vertical shafts, buildings, cabinets (panels), tables, and pipe outlets are sealed; a cable laid in a neatly arranged and horizontally laid cables, fixed points should be set at the ends of the head and tail, on both sides of the turn, and at every 5 to 10m. 5. Cable laying
(1) Cable laying process description: Before laying the cable, use an insulating shaking meter to measure the insulation resistance of each phase of the cable core. The cables of 1kv and below should not be less than 100MΩ, and cables of 6KV and above should not be less than 200MΩ. The cable trench should be clean and dry. When there is no requirement for the design, the distance between the uppermost layer of the bracket to the top of the shaft or the floor shall not be less than 150-200mm, the distance between the lowermost layer to the bottom of the groove or the ground shall not be less than 50-100mm, the minimum allowable distance between the bracket layers, the control cable is 120mm, and the power cable is 150-200mm. (2) Description of the cable laying process on the bracket: When laying the cable on the bracket, it should be arranged according to the voltage level, with the high voltage on the top, the low voltage on the bottom, and the control cable at the bottom. Cables laid vertically or inclined above 45° are fixed on each bracket; fixtures and brackets for fixing AC single-core cables or split-phase cables do not form a closed ferromagnetic circuit (cannot be fixed with iron parts, nylon cable ties can be used); cables are arranged neatly and rarely crossed; cables laid horizontally have fixed points at the ends of the head and tail, on both sides of the turn, and at every 5-10m. Signs should be set at the first section, end and branch of the cable.
(3) Mineral cable laying process instructions: Mineral cables are recommended to be laid separately. If they cannot be laid separately from other insulated cables, or if the temperature is inconsistent with other insulated cables, they should be laid separately or separated by partitions. After the mineral cable is discharged, the end of the cable must be wrapped with tape. When laying cables, there should be no less than twice the gap between each cable, and if there is no gap left, the current carrying capacity reduction coefficient should be considered. The following anti-edeem current measures should be taken when laying the AC system single-core cable : ① The cable should be divided into circuits and exited steel distribution boxes (cabinets) and bridges; ② The cable should not form a closed ferromagnetic circuit when fixed by metal parts or tied with metal wires; ③ When the cable passes through the reserved holes in steel pipes (steel casings) or reinforced concrete floor slabs and walls, the cable should be laid in circuits.(4) Pre-branched cable laying process description: Check the cable channel before the pre-branched cable construction to confirm whether the pre-branched cable can pass through the through holes. Then place the cable on the wire rack, usually place the cable downstairs, and lift the cable up during installation. During the lifting process, do not apply tension to the branch lines. Use cables with a cable weighing more than 4 times the strength of the cable. Elevate and check while keeping the cables from getting injured. When the cable mesh sleeve for lifting reaches the top, hang the mesh sleeve on the pre-embedded hook , and fix the middle part of the cable, with a fixed spacing of 1.5 to 2m. The single-core cable is fixed with a saddle clamp.
(5) Cable puncture branch connection process description: The puncture clamp connection is only suitable for plastic insulated cables, and is not suitable for mineral insulated cables; the puncture connection cable should be laid along the wall, and be used with caution when punctured in the bridge frame. The outer insulation peeling length of the main cable connected to the puncture is 50 times the outer diameter of the main cable (and the different wire clamps of the same branch cable should be kept at a distance of 80-100mm), and the positions of each puncture clamp are distributed in this length; after the branch cable of one layer is connected, power should be sent in time for branch quality verification, after passing the verification, power will be cut off for the next layer of puncture construction, and the bridge cover plate of this layer or the electric well door of this layer is locked. (6) Cable fireproof sealing process description: When the building height exceeds 100m, the cable holes passing through each floor must be fire-proof sealed; when the building height is within 100m and less, the fire-proof sealing will be done once every 3 floors. Just use fireproof mud to seal the floor hole. Firewalls should be installed in cable trenches, and the thickness should not be less than 150mm. For places where cables in the trench cross and densely packed (such as the cable layer of the electronic computer room) you can use firewalls to build firewalls. All cable holes and holes passing through the floor slabs should be sealed with unorganized fire-proof blocking materials, fire-proof partitions or fire-retardant packs. The sealing thickness should not be less than 100mm and should be flush with the floor slab thickness. 6. Catheter laying
(1) Catheter positioning process description: Determine the position of each junction box based on the deepening design drawings and construction drawings. After the building template is installed, you can use a tape measure and powder pulling wire to determine the position of the junction box on the template, and use paint to mark the box position and conduit direction. (2) Instructions for fixing process of the conduit: The hidden electrical pipe should be tied and fixed with steel bars perpendicular to the direction of the conduit. The binding position requirements are: not more than 150mm from the edge of the wire box, the maximum distance between the wiring tube binding points shall not be more than 1m, and the maximum distance between the steel pipe binding points shall not be more than 1.5m. The minimum clear distance between the concealed parallel catheters shall not be less than 10mm; the catheters shall not be stacked more than 2 layers. The electrical wiring pipes must be made of the same material as the wire box and the pipeline sturdy parts; the spare "knocking holes" of the junction box should not be knocked out, and the intermediate junction box should be covered and closed. Compensation devices should be installed at the deformation joints of the building. When the pipe is concealed, the bending radius should not be less than 6 times the outer diameter of the pipe. When buried underground or in concrete, the bending radius should not be less than 10 times the outer diameter of the pipe, and the bending flatness at the bend of the conduit should not be more than 1%.
(3) Catheter protection process description: All catheter joints are wrapped with sealing tape at least three layers; the catheter direction paint mark should be made on the formwork of the catheter in the board in a timely manner; the catheter buried directly in the floor slab should be exposed to the ground or floor slab at about 100mm, and should not be exposed at the corners of the secondary masonry. To prevent the cement mortar from entering the pipe during watering, the individual upward pipe mouth is pressed against the top with bamboo joints or special protective mouths and fixed with sealing tape.
(4)Connecting process of conduit and equipment: No flexible conduit shall be used except where electrical conduits are connected to lamps and electrical equipment. The rigid conduit is connected to electrical equipment and appliances through a flexible conduit. The length of the flexible conduit is not greater than 0.8m in power engineering and not greater than 1.2m in lighting engineering. The connection between flexible metal pipes or other flexible conduits and rigid conduits or electrical equipment and appliances is made of special joints; the connections of composite flexible metal pipes or other flexible conduits are well sealed, and the liquid-proof cover layer is intact and is not damaged; electrical conduits that enter equipment outdoors or roofs must be equipped with waterproof bends.(5) Instructions for groove removal process: When laying grooves, the cutting depth is the diameter of the pipe + 1.5 cm, and the width is determined as the diameter of the pipe + 2.0 cm. If multiple pieces are laid side by side, the width is N (number of pieces) × (pipe diameter + 3.0 cm. The gap of the four sides of the wire box is determined to be the size of the box + 2 cm for easy sealing. The mouth of the box should be 1.0-1.5 cm higher than the matte wall, and the slope is protected by mortar powder around the box. Use cement mortar with a strength level of not less than M10, and the thickness should not be less than 15 mm. The evacuation lighting line uses fire-resistant wires and cables, and the pipe is applied openly or the rigid conduit is applied secretly in the non-combustion body. The thickness of the covert protective layer is not less than 30 mm. When the wall is cut into grooves and is equipped with multiple wire pipes, after the groove is repaired, a wire mesh is added to prevent hollowing and cracking on the wall.
(6) Welded steel pipe connection process description: Thick-walled black steel pipe (SC steel pipe) is welded with casing. The length of the sleeve should be 1.5 to 3 times the outer diameter of the pipe and cannot be welded with the opposite ends. There is no need to do jumper wire at both ends of the span sleeve. At both ends of the span junction box, round steel of Φ6 or Φ8 is still needed to use Ω type. Generally, it is bent into an Ω type. Pay attention to double-sided welding, and the length of the welding is 6 times the diameter of the round steel. The welded steel pipe is connected to the junction box by right-angle wire, and the inner and outer sides are fixed. The steel pipe is inserted into the box with hexagonal locking nanoparticles (nanoparticles) and fixed. The steel pipe is penetrated into the box with two wire distances except the hexagonal locking nanoparticles.
(7) Thick galvanized steel pipe connection process description: Thick wall galvanized steel pipe is connected by thread, and the two ends of the connection are special grounding wire card jumping grounding wire. Thin-walled steel pipe is prohibited for outdoor electrical piping. (8) Connection process description: When the pipe diameter DN ≤25 of the socket type thin-walled steel pipe is not less than 2 at each end, and when the pipe diameter DN ≥32, the crissing point of each end should not be less than 3 at each end. The depth of the connection crissing point should not be less than 1.0mm. The concave and convex points formed by the crissing of the pipe wall should not have burrs. (9) Connection process description of the casing tight fixed steel pipe (JDG pipe ): When the diameter DN ≥32 of the JDG pipe, the html at each end of the connecting casing should not be less than 1.0mm. The concave and convex points formed by the crissing of the pipe wall should not have burrs. (9) Connection process description of the casing tightening steel pipe (JDG pipe ): When the diameter DN ≥32 of the JDG pipe, the html at each end of the connecting casing should not be less than 1.0mm. The concave and convex points formed by the crissing of the pipe wall should not have burrs. (9) Connection process description of the casing tightening steel pipe (JDG pipe ) 3. The should not be less than 2. When the JDG pipe is bent and connected, the pipe ports at both ends of the bent pipe are inserted into the grooves of the casing joints. After positioning with the tightening screws, tighten to the nut and fall off. When the JDG pipe is connected with the straight pipe pipe, the two pipe ports are inserted into the middle of the straight pipe joints, close to both ends of the grooves. After positioning with the tightening screws, tighten until the nut falls off. When the pipe is connected with the pipe, the pipe and the box (box) meet the requirements of the specification, there is no jumper grounding wire at the connection. The pipeline shell should be reliable grounding.
(10)PVC conduit connection process instructions: Apply glue the processed pipe end and directly insert it into the direct head or lock section of the wire pipe. The individual upward pipe mouth is snapped against the top with bamboo joints and fixed with sealing tape. Also use a matching pipe plug to seal the upward pipe opening. Do not fire or burn electricity near the concealed PVC pipe or gas welding . According to the wall thickness of the PVC threading pipe, there are three types: A-type thickened type, B-type general type, and C-type thin-walled type. There are also divisions based on ultra-light Z1 (105), light Z1 (205), medium Z1 (305), and heavy Z1 (405), and cannot be mixed.
(11) Direct burial process instructions for electrical pipelines: 1. The electromechanical installation pipeline must be adjusted to the center; 2. The masonry of 100-thick walls requires cutting bricks or customization of specific U-shaped bricks; 3. Single-sided lintels are set at strong and weak boxes; 4. All mechanical and electrical installation pipelines and wire boxes are installed in place in advance according to the drawings and design changes, and only after acceptance is passed can masonry construction be carried out; 5. Civil construction masonry project is interspersed and cooperated with the electromechanical installation unit. 6. During the masonry construction, mechanical and electrical installation personnel are required to cooperate on site and provide in-place instructions to avoid excessive reserved holes due to deviations in the installation of wire boxes; 7. During the masonry construction, strictly follow the specifications, especially for more than 300 holes caused by direct burial process, lintels should be installed (a single-sided lintels can be solved). 7. In-tube threading (1) In-tube threading process description: Three-phase or single-phase AC single-core cables shall not be penetrated into the steel conduit alone. The total cross-sectional area (including the outer cover) of the protective tube threaded in the pipe should not exceed 40% of the cross-sectional area in the pipe. When using cable protection tube , the inner diameter of the pipe through the tube should not be less than 1.5 times the outer diameter of the cable. The wire should not have joints in the pipe, and the joints should be carried out in the junction box.When multi-phase power supply is used, the color selection of wire insulation layers of the same building and structure should be consistent, that is, the protective ground wire (PE line) should be yellow-green interphase color, and the neutral line should be light blue; phase line uses: phase A-yellow, phase B-green, phase C-red.
(2) Wire reservation process description: The reserved length of the wires in the junction box, switch box, socket box and lamp head box should be 120mm; the reserved length of the wires in the distribution box should be 1/2 of the circumference of the distribution box; the reserved length of the wires out of the home should be 1.5m. When passing through the socket circuit, do not cut the wire at the middle line box. After leaving it as required by the reserved length, pass it directly to the next line box.
(3) Wire connection process description: BV-6 and below use flame retardant safety crimp cap connection, multi-strand copper core wire is tin-encrusted or crimped. The linear connection of single-core copper conductors can be done by articulation or winding. The twisting method is suitable for single-core wire connections of 4mm2 and below. The winding method is suitable for direct connection of single core wires of 6mm2 and above. The connection between core wire and electrical equipment shall comply with the following provisions: 1. Single-strand copper core wire with a cross-sectional area of 10mm2 and below and single-strand aluminum core wire is directly connected to the terminals of the equipment and appliances; 2. Multi-strand copper core wire with a cross-sectional area of 2.5mm2 and below is tightened with tin or connected terminals and connected to the terminals of the equipment and appliances; 3. Multi-strand copper core wire with a cross-sectional area of more than 2.5mm2, except for the plug-in terminals of the equipment, the connection terminals are connected to the terminals of the equipment or appliances; before connecting the multi-strand copper core wire is connected to the plug-in terminals, the ends are tightened; 4. Multi-strand aluminum core wire is connected to the terminals of the equipment and appliances after connecting the terminals; 5. There are no more than 2 wires of terminal wires for each device and appliance. 8. Cable head production (1) Description of the process of making dry-pack cable head: The core wire connecting the cable (connecting pipes and terminals) should be adapted to the specifications of the core wire, and open terminals shall not be used. The cable sheath layer should not peel off outside the screen cabinet, and the starting point of the peeling must be made into a claw-shaped sleeve insulated and sealed.
(2) Heat-shrink cable head production process description: The heating temperature should be controlled to 110℃-130℃. When heating, follow the initial shrinkage position and direction recommended in in . Shrinking from bottom to top is conducive to eliminating gas and enhancing seals. Before inserting each layer of pipe fitting, the coated area and the bonded sealing section should be preheated and then cleaned with cleaning paper. The shrinking pipe fittings should be smooth and wrinkle-free, and the original structural outline can be clearly seen. A small amount of sealant is extruded to indicate a perfect seal. (3) Description of the production process of mineral cable intermediate head: The intermediate connection of the cable should be connected by press-mounted, crimped, and screw-connected intermediate connection terminals; cable terminals above 35mm2 cross-section must be press-mounted terminal wiring terminal . Except for laying in the horizontal bridge, the cable connection accessories in the middle of the cable and the cables within 300mm on both sides should be reliably fixed, and a color mark should be made. The cables laid horizontally in the bridge tray should be straight, and the intermediate connection accessories must not bear external forces.
(4) Description of the production process of mineral cable terminals: Single-core mineral cables can be made of heat shrinkable terminals or tank sealing terminals; multi-core mineral cables can only be made of tank sealing terminals. The insulation test of multi-core cables also includes insulation tests between wire cores. The cable end seal should be installed in time with the cable laying. Before installing the end seal, the cable should be tested for insulation resistance, and its insulation resistance value should not be less than 100MΩ. 9. Instructions for installation technology of ordinary lamps: When the weight of the lamp is greater than 3kg, it is fixed to a bolt or a pre-embedded hook; and an overload test is performed at twice the weight of the lamp; when the weight of the lamp is 0.5kg or less, it is used to hoist itself; when the lamp is greater than 0.5kg, it is used to hoist the lamp itself; lamps with hoisting chains and the soft wires are braided in the hoisting chain, so that the wires are not subjected to stress; the lamps are fixed firmly and reliably, and no wooden wedges are used. Each lamp shall be fixed with no less than 2 screws or bolts; when the diameter of the insulating table is 75mm or less, one screw or bolt shall be used to fix it; the lamps in the distribution room of and generator room shall not be installed directly above the electrical cabinet and busbar trough; the center deviation of the lamps in line shall not be greater than 5mm.
(2) Decorative chandelier installation process instructions: lamp hook round steel diameter should not be smaller than the diameter of the lamp pin, and should not be less than 6mm. The fixing and suspension devices of large lanterns should be overloaded tests at twice the weight of the lamp. (3) Safety exit light installation process instructions: Evacuation lighting consists of safety exit sign light and evacuation sign light. The height of the safety exit sign light is not less than 2m away from the ground and is installed above the evacuation exit and the inner side of the stairs;
(4) Evacuation indicator light installation process description: The evacuation sign light is installed on the top of the safety exit, and the stairwell, evacuation walkway and its corners should be installed on a wall below 1m. Parts that are not easy to install can be installed on the upper part. The spacing between the sign lights on the evacuation passage shall not exceed 20m (civil defense project shall not exceed 10m); 11. Switch socket installation (1) Socket installation process description: When there is a power supply for household appliances with hazardous electric shock, a switch socket with a power supply that can disconnect the power supply, and the switch will be disconnected; a protective socket with sealed and protective ground contact is adopted in humid places, and the installation height shall not be less than 1.5m. When safety sockets are not used, the installation height of children's activity places such as nurseries, kindergartens and primary schools shall not be less than 1.8m; the installation height of sockets in workshops and test (actual) laboratories shall not be less than 0.3m from the ground; the concealed sockets in special places shall not be less than 0.15m; the installation height of sockets in the same indoor sockets shall be the same; the concealed socket panels shall be close to the wall, with no gaps around, firm installation, smooth and tidy surfaces shall not be broken or scratched, and the decorative caps shall be complete. The floor socket panel is flush with or close to the ground, the cover plate is firmly fixed and well sealed. Note: The socket height of the same room is the same.
(2) Switch installation process description: The switch installation position is easy to operate, the distance between the switch edge and the edge of the door frame is 0.15~0.2m, and the height between the switch and the ground is 1.3m~1.4m. The concealed switch panel should be close to the wall, have no gaps around it, be firmly installed, have smooth and neat surface, no cracks or scratches, and have complete decorative caps. Note: The switches in the same room are the same height.
(3) row of switches and socket installation process instructions: the same model parallel installation and the same indoor switch installation are consistent, and the control is in order and good position. The adjacent spacing between pull-wire switches installed in parallel shall not be less than 20mm. The switches installed in rows should be straight, firm, and uniformly spaced, and the spacing should not be greater than 2mm. 12. Power-on trial operation of building lighting (1) Process description of the steps and procedures of lighting power-on trial operation: 1. Check before power-on trial operation: 1. Check whether the wiring of the main power switch to the incoming line of each lighting circuit is correct; 2. The lighting distribution box and circuit signs should be correct and consistent; 3. Check whether the wiring of the leakage protector is correct, strictly distinguish between the working neutral wire (N) and the ground wire (PE). The ground wire (PE) is strictly prohibited from connecting to the leakage switch; 4. Check whether the connection of each terminal in the switch box is correct and reliable; 5. Disconnect the power switch of each circuit, close the main incoming line switch, and check whether the leakage test button is sensitive and effective. 2. Power-on power-on in the circuit: 1. When all the switches of the circuit lamps and other electrical equipment are placed in the disconnected position; 2. Close the power switches of each circuit one after another; 3. Close the control switches of the lamps and other control switches of the circuit one after another, check whether the switches and lamp control sequence correspond to each other, the steering of the fan and the speed control switch are normal; 4. Use the test pen to check whether the phase sequence connection of each socket is correct, and whether the switches with switches and sockets can correctly turn off the phase line. 3. Fault inspection and rectification: 1. Problems should be eliminated in time when they are found, and no live operation of must be done; 2. Problems found during the inspection should be isolated and eliminated by loops to solve them; 3. The phenomenon of tripping when the switch is powered by power supply and leakage protection is focused on checking whether the working neutral wire and the protection neutral wire are mixed and whether the wire is insulated poorly; 4. The system is powered on and trial operation continuously. 4. Power-on trial operation record, record once every 2 hours. (2) Process description of the lighting power-on trial operation requirements: when the lighting system is powered on, the lamp circuit control should be consistent with the identification of the lighting distribution box and circuit; the switches and lamp control sequence correspond to the lamp control sequence. The continuous trial operation time of the public building lighting system should be 24 hours, and the continuous trial operation time of the civil residential lighting system should be 8 hours. All lighting fixtures should be turned on, and the operating status should be recorded once every 2 hours, and there will be no faults during the continuous trial operation time.13. Lightning protection grounding installation (1) lightning protection lead-down process description: The welding of grounding device should be lap welding, and the lap length should comply with the following regulations: flat steel overlaps with flat steel are twice the width of flat steel, no less than three-sided welding; round steel and round steel are 6 times the diameter of round steel, and double-sided welding; round steel and flat steel are 6 times the diameter of round steel, and double-sided welding; flat steel and steel pipes, flat steel and angle steel are welded, close to both sides of the outer side of the angle steel, or close to the surface of the 3/4 steel pipe, and weld on both sides of the upper and lower sides; except for welding joints buried in concrete, there are anti-corrosion measures.
(2)Drawing line Drawing process description: Use the main ribs of the building column as the grounding line to apply yellow paint to paint the lowering line 0.3m from the ground, and the paint length is 10cm.
(3) Roof Lightning Belt Process Description: The lightning protection line should be laid horizontally or vertically, and can also be laid parallel to the inclined structure of the building; the lightning protection line should be straight and firm, and should not have high and low undulations or bending phenomena, and should be 100mm away from the surface of the building. The distance between the support parts should be 0.5 to 1.5m in the horizontal straight part; the vertical part should be 1.5 to 3m; and the turning part should be 0.3 to 0.5m. When welding hot-dip galvanized steel, hot-dip galvanized anti-corrosion will be damaged, and anti-corrosion should be done within 100mm of the welding mark. The lightning protection lead-up should be made of a permanent mark with a metal nameplate. Lightning protection system must use hot-dip galvanized materials and finished parts. (4) Ground resistance test point process description: Manual grounding device or grounding device using building foundation steel bars must set test points above the ground according to the design requirements. The test point should form a disconnection card, and galvanized bolts should be used to tighten the connection for easy inspection and testing. Terminal boxes are generally used at the test points. If the junction box is cancelled, the fixing parts of the hole cover should be buried on the hole wall and the inner wall should be wiped with cement mortar. The production of test points should be combined with the exterior decoration of the building to be practical and beautiful.
(5) Roof metal pipe grounding process description: Roof metal pipes must be grounded reliably and must not be welded directly. They must use grounding snap rings and are connected to grounding flat steel using copper core soft wires, and have complete anti-loosening parts. (6) Grounding process description of roof metal components: Other metal components exposed on the roof must be connected to the lightning protection belt to form an integral electrical path. Each component must not be connected in series and must be connected separately to the grounding main line.
(7) Indoor metal doors and windows grounding process description: When the height of the second-class lightning protection building exceeds 45m, larger metal objects such as railings, doors and windows on the exterior walls of 45m or above should be directly connected to the lightning protection device or through embedded parts. Class III lightning protection buildings When the height of the building exceeds 60m, larger metal objects such as railings, doors and windows on the exterior walls of 60m or above should be connected directly or through embedded parts to the lightning protection device. When the metal doors and windows are grounded, the connecting conductors should be covered secretly, and should be carried out after the window frame is positioned and before the wall decoration layer or plaster layer is constructed.
(8) Grounding process instructions for metal shell of lamp: When the height of the lamp is less than 2.4m from the ground, the exposed conductor of the lamp must be grounded (PE) or zeroed (PEN) reliable, and should have special grounding bolts. (9) Description of the process of jumping between distribution box and metal conduit: The metal frame and base steel of the cabinet, screen, table, box and disk must be grounded (PE) or zeroed (PEN) reliable; openable doors equipped with electrical appliances, and bare braided copper wire is connected between the grounding terminals of the door and the frame, and are marked. The connection between the metal conduit and the distribution box must be grounded and jumped, and each pipeline must be connected separately to the busbar or grounding main line and must not be connected in series.
(10) Distribution room door (frame) grounding process description: The transformer distribution room door and door frame must be grounded and connected to the indoor grounding trunk line to form a good electrical path. Braided copper wire should be used for grounding connections between the fence doors of the distribution room isolation and static compensation devices and the metal door hinges of the transformer distribution room. The lightning arrester in the substation room uses the shortest grounding wire to connect to the grounding main wire. (11) Electrical equipment grounding process description: The grounding of each electrical device should be connected with the ground busbar or grounding main line by a separate grounding wire. It is strictly forbidden to connect several electrical devices that need grounding in one wire. Important equipment and equipment structures should have two grounding leads connected to different locations from the main grounding network.In addition, each grounding lead should meet the requirements of thermal stability and mechanical strength, and the connecting lead should be convenient for regular inspection and testing.
(12) Description of the jumping process of metal pipes: There is generally no need to add jumping wires to the connections of metal pipes. However, the water meter of the water supply system and the small section of the plastic pipe in the metal pipes need to be connected to ensure the effective equipotential connection and grounding of the metal pipes.
(13) Distribution room grounding trunk process description: Installation requirements for explicitly laid grounding trunk in the transformer distribution room: The grounding device is easy to check, and the laying position does not hinder the disassembly and maintenance of the equipment; when laid horizontally along the building wall, the height is 250-300mm from the ground; the gap with the building wall is 10-15mm; when the grounding wire spans the deformation joint of the building, a compensation device is installed; the surface of the grounding wire is 15-100mm in length, and each section is painted with yellow and green stripes respectively; no less than 2 wiring posts or ground bolts for temporary grounding should be installed on the grounding trunk of the transformer room and high-voltage distribution room. A mouse block must be installed at the door of the transformer distribution room, and the height of the mouse block is not less than 600mm. (14) Description of the total equipotential connection process: The equipotential connection trunk line of a building should be drawn out from the grounding trunk line or total equipotential box directly connected to the grounding device. The equipotential connection trunk line or the connection line between the local equipotential box forms a ring network. The ring network should be connected nearby to the equipotential connection trunk line or the local equipotential box. The branch lines should not be connected in series.
(15) Local equipotential coupling process description: The equipotential coupling terminal board should be bolted for disassembly and periodically tested. Conductivity test should be carried out after the installation of the equipotential coupling. The power supply for the test can use DC or AC power supply with no-load voltage of 4~24V, and the test current should not be less than 0.2A. When the resistance between the equipotential coupling terminal plate and the ends of metal bodies such as metal pipes within the equipotential coupling range is measured to be no more than 3Ω, it can be considered that the equipotential coupling is effective. If a pipe connection with poor conduction is found, a jumper should be used, and conductivity tests should be performed regularly after it is put into use.
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