Metal trough wiring installation
1 scope
The technology standard is applicable to building metal trough wiring installation project.
2 construction preparation
2.1 material requirements:
2.1.1 metal trough and its accessories: finalize the design product through galvanized processing should be adopted. Its model, specification should comply with the design requirements. Slot should be smooth level off, both inside and outside edges, should not be distorted, become warped edge, such as deformation phenomenon.
2.1.2 insulated wires, it must comply with the design requirements, specifications, and product certification.
2.1.3 screw connection button: suitable for aluminum conductor under 6 was crimping. When choose, should choose according to conductor cross section and wire number corresponding models of spiral wire reinforced insulation steel shell button.
2.1.4 LC secure line pressing cap for requirement, please see 2 -- 8, 2.1.5 related content.
2.1.5: casing pipe copper tube, aluminum and copper aluminum transition casing pipe three, when should be the same as the material of the wire, and specifications corresponding casing.
2.1.6 metal bolts: should choose according to the allowable tension and shear.
2.1.7 terminal (wiring nose) : when choose, should according to the number of conductor cross section and the corresponding specifications of the terminal.
2.1.8 galvanized material: steel, round steel, flat steel, Angle steel, bolt, nut, screw, washer, spring cushion when doing electrical components, metal materials should be treated with galvanization.
2.1.9 auxiliary materials: drilling, welding electrode, oxygen, acetylene gas, mixed paint, solder, flux, rubber insulating tape, plastic insulation tape and black tape, etc.
2.2 the main equipment:
2.2.1 pencil, tape measure, line drop, cord bag, tin pan, burner.
2.2.2 electrician tools, hand electric drill, impact drill, megohm meter, multimeter, tool bag, toolbox, high stool, etc.
2.3 operation conditions:
2.3.1 fit the structure of the civil construction, reserved holes, embedded iron and embedded derrick, hanger, etc is complete.
2.3.2 ceiling and metope of shotcrete, paint and wallpaper, after the completion of all before the slots to trough installation and wiring.
2.3.3 high-rise buildings in the shaft construction wet homework is complete.
2.3.4 ground trough should cooperate with civil engineering construction in a timely manner.
3 operation process
3.1 process:
3.2 play line positioning: according to the blueprints to determine into line, box, box, cabinet and other electrical appliance installation location, from beginning to end (after the first main feeder) looking for a good horizontal or vertical line, with a chalk line bag along the walls, ceiling, and the place such as the ground, in the line of the centerline of elastic line, according to the regulations of the design requirements and construction acceptance specifications, always span mark location and a pen.
3.3 reserved holes: according to the drawings with the axis of the site, the precast processed wood or iron frame, fixed in the position of mark, and straightening is find, for cast-in-situ concrete template is dismantled, remove the framework, and smoothing mouth hole (the hole), please.
3.4 support and hanger installation requirements and buries the derrick, hanger.
3.4.1 track support and hanger installation requirements:
3.4.1.1 support and hanger steel should be straight, no significant distortion. After blanking length deviation should be within the scope of the 5 mm, incision should be no edge, burr.
3.4.1.2 steel support and hanger should be welded firmly, no significant deformation and uniform weld formation and weld length should comply with the requirements, shall not appear crack, bite edge, porosity, cave, leakage welding, welding defects such as leakage.
3.4.1.3 support and hanger should be installed firmly, to guarantee the horizontal even vertical, mounting bracket on the slope of building and hanger should be the same as the building has a slope.
3.4.1.4 support and hanger of the specifications of the general should not be less than the flat iron 30 mm * 3 mm; Flat steel 25 mm * 25 mm * 3 mm.
3.4.1.5 it is forbidden to use welding cutting steel structure or any part of the light steel keel, all should do the anti-corrosion treatment after welding.
3.4.1.6 universal sling finalize the design product, should be adopted to lifting of slot, and should have a separate lifting fixture or support system.
3.4.1.7 fixed protection/anchors spacing generally should not be greater than l. 5 ~ 2 m. In turn in and out of the box, box, cabinet, corner, and both ends of deformation cracks and t-joint three-terminal fixed support point shall be set up within 500 mm.
3.4.1.8 support and hanger distance of the upper floor should not be less than 150 ~ 200 mm; Apart from the ground height should not be less than 100 ~ 150 mm;
3.4.1.9 it is forbidden to use the brackets and cradles for the wood block.
3.4.1.10 light steel keel laying trough should have their own separate assembly fixture or support system, derrick diameter should not less than 5 mm; Support should be fixed on the main keel, should not be fixed on the auxiliary keel.
3.4.2 embedded derrick, hanger:
Adopts the round steel not less than 5 mm in diameter, after cutting, straightening, simmer bending, welding steps into a boom, hanger, etc. Department of port shall be tapping for adjustment. In cooperate with civil structure, should be as on steel reinforcement at the same time, the derrick or pylon anchorage marked in a fixed position. In concrete pouring, with care to prevent the boom or displacement of the frame. Shuttering shall not be damaged when the boom end of thread.
3.5 embedded iron home-made processing should not be less than 120 mm x 60 mm x 6 mm; The anchoring round steel should not be less than 5 mm in diameter. Will closely cooperate with civil engineering structure construction, embedded iron flat steel mesh piece below, close to the template, binding or welding method can be used to anchor bar in the reinforced online. Template is dismantled, embedded iron plane should be bare, or eat into depth is in commonly 10 ~ 20 mm, then made of plates or Angle bracket, hanger welding fixed on it.
3.6 steel structure: stents or hanger can be directly welded on the steel structure of fixed location. Also can use a universal sling for installation.
3.7 metal expansion bolt installation
3.7.1 metal expansion bolt installation requirements
3.7.1.1 suitable for C5 above concrete member and solid brick wall, does not apply to the hollow brick wall.
3.7.1.2 hole diameter of the error must not exceed + 0.5 ~ 0.5 mm; Depth error must not exceed + 3 mm; After drilling, hole residual debris removal shall be clean.
3.7.1.3 bolt, after their head deflection value should not be greater than 2 mm.
3.7.1.4 bolt and the quality of the casing shall be in accordance with the technical conditions of the product.
3.7.2 metal expansion bolt installation method
3.7.2.1 first along the walls and roof according to the design of elastic line positioning, mark the location of the fixed point.
3.7.2.2 according to scaffolding hanger under load, select the corresponding metal expansion bolt and drill bit, the selected bit length should be greater than the length of the casing.
3.7.2.3 perforating depth should be buried all casing wall or roof, it is advisable to performance level.
3.7.2.4 should be cleared to play a good hole in the debris, and then use wooden hammer or after mat wood, the expansion bolt with the hammer to knock into the hole, should guarantee the casing surface is flush with the architecture, the bolt end are exposed, shall not damage the bolt thread tapping.
3.7.2.5 buried after good bolt, nut available with corresponding gasket will support or hanger directly fixed on the metal bolts.
3.8 trough installation:
3.8.1 trough installation requirements:
3.8.1.1 trough should level off, without distortion, no burr inside, complete all kinds of accessories.
3.8.1.2 trough interface should level off, juncture place should be tight straight. Slot cover mount should level off, without a newborn, outlet position accurately.
3.8.1.3 laying in the ceiling, if the ceiling can't person manhole shall be maintained.
3.8.1.4 through the walls of the trough are not allowed to be together with the holes on the wall with death.
3.8.1.5 trough all non conductive part of the iron shall be connected and jumper, make it become a conductor in a row, and completes the whole earth.
3.8.1.6 when the trough bottom of distance is less than 2.4 m, slot itself and the trough plate must be equipped with ground protection. 2.4 m above the ground slot cover plate without protection.
3.8.1.7 trough after the structure of the deformation cracks, expansion joints and settlement joints, slot itself should be disconnected, groove with overlapped connection plate, don't need to be fixed. Protect the earth wire and wire groove are compensation allowance shall be maintained.
3.8.1.8 equipped in the shaft, the place such as condole top, channel, mezzanine and equipment layer of trough should comply with the (code for fire protection design of tall buildings fire protection requirements (GB50045-95).
3.8.2 trough installation to install
3.8.2.1 trough straight segment connection should use connecting plate, washer, spring washer, nut fastening, summer-planting place should be closely flush.
3.8.2.2 trough the intersection, turn, t-shaped connection, should use single-pass, two-way, tee, four-way or plane two-way, such as graphic tee for flexible connection, wire junction terminal block should be set up or wire connector is placed within the electrical appliances.
3.8.2.3 trough and the summer-planting such as box, box, cabinet, BaoJiao should be adopted into the line and the place such as outlet connections, and screw fastening, terminal shall be equipped with seal.
3.8.2.4 building surface, such as slope, slot should change with the slope. After being all wiring duct laying out, should be adjusted to check before wiring. After confirm qualified, and then to slot wiring.
Lifting wire slot 3.9:
Universal sling commonly used in steel structure, such as i-beam, Angle steel, light steel keel structure, can advance will sling, fixture, derrick, hoisting device assembled into a whole, in place of mounting position for lifting, one by one to lifting fixture on the steel structure, pressure will be top wire turns into prison.
3.9.1 trough line segment assembly, main should do first, then do branch line, the hoisting apparatus and the trough place card together with butterfly, according to this method, the trough is presented.the assembly forming.
3.9.2 trough to trough can be used in the connection head or outside connection, with flat pads and trampoline with nut fastening.
3.9.3 trough cross, t-shaped cross, two-way, tee, four-way, have to be adopted to connect, wire connection should be set up joint cassette in electrical appliances, wire slot is absolutely not allowed to have a wire connector.
3.9.4 turning parts should be made on the elbow and her elbow, appropriate to installation Angle.
3.9.5, outlet place should use the outlet box are connected, the end part to mount seal, in the outlet and inlet line of box, box, cabinet BaoJiao connection should be adopted.
3.10 the ground trough installation:
Slot on the ground, when installation should cooperate with civil ground engineering construction in a timely manner. The flatness pattern is different, first sight, and then determine the position fixed point, will good lie bolt and clamp slot placed on the bed, then the slot connection. Such as trough and pipe connection; The slot connected to the junction box; Junction box connected to the pipe; The slot outlet connection; Slot end processing, etc., should be installed, screw fastening. All good ground trough and accessories, and then conduct a system adjustment, mainly according to the thickness of the ground, adjust the slot lines carefully, branch lines, cable box joint, turning, the place such as corner, export, flush with the ground level height requirement, various lifted the lid cover into sealed, in order to prevent the cement mortar, until the end of the civil engineering construction on the ground.
3.11 trough in protecting ground installation:
3.11.1 protect earth wire should be laying online groove side according to design requirements, meet is located in the screw diameter should not less than 6 mm; And the need to add flat washer and spring washer, and nut firm pressure.
3.11.2 the width of the metal trough within 100 mm (100 mm), two trough using connection plate joint (i.e., when doing ground connection plate), each end screw fixed point of not less than 4; Width is more than 200 mm (200 mm) with two ends groove to protect each end of ground screw fastening point of the connection plate connection not less than 6.
3.11.3 trough plate protective earthing requirements see article 10.4.7.
3.12 line slot wiring
3.12.1 trough inside wiring requirements
3.12.1.1 line slot before wiring should eliminate trough of water and dirt.
3.12.1.2 within the same trough (including insulation) cross-sectional area of the combined should not exceed 40% of the internal area.
3.12.1.3 trough bottom downward wiring, branch wire shall be binding with nylon tie belt of bundles, respectively, and the fixed online slot under the floor, in case the wire down.
3.12.1.4 different voltage, different circuit, different frequency of the wire slot should add partition on the same line. The following circumstances, can be directly put inside with a trough: voltage 65 v and below: the same equipment or the same assembly line of the drive and control circuit; All circuits of lighting lanterns; Lighting circuit of three phase four wire system.
3.12.1.5 conductor is large, besides using wire sheath color to distinguish the phase sequence, can also use the wire end and turning on the method of marking to distinguish.
3.12.1.6 when crossing the deformation cracks of the building, wire compensation allowance shall be maintained.
3.12.1.7 terminal box wiring reserve should not be more than 15 cm in length; Plate, the length of conductor is reserved in the cabinet shall be 1/2 of its circumference.
3.12.1.8 from introducing outdoor, indoor wires through the wall of a rubber insulated wire should be adopted, not allowed to use plastic insulated wire. The outer edge of the wall protection tube should be waterproof measures.
3.12.2 trough inside wiring methods:
3.12.2.1 cleaning trough:
When cleaning the Ming fu trough, usable dishcloth net residual impurities and swelling in the slot, the slot inside and outside clean; Apply cleaning the shadow on the ground in the trough, can will take first line through to the outlet, and then take cloth tied to the line end, on the other side to pull cloth, repeatedly can clean up the debris and water within the slot. Also can use air compressor to blow out impurities and water in the trough.
3.12.2.2 pay-off pay-off should first check before: (a) junction between tube and the slot to protect the mouth is complete; The choice of wires and protecting the earth is in line with the design requirements; Root tube into the box inside and outside the mother whether lock, pay-off again after confirmed. (b) the feeding method: first will straighten wires, sequence, into the circle or on the pay-off stand (car), from the beginning to the end (regional) after trunk line, first put while finishing, should not appear extrusion back clasp, kink, the phenomenon such as damage wire. Each branch should tie beam, nylon banding tape should be used when binding, are not allowed to use metal wire binding. (c) the ground trough pay-off: use belt line from the outlet end to the other end, will lead release, straighten, sequence, stripped end insulation layer, and tags, then bring conductor bundle in online, and then can be drawn from the other end. Pay-off should be piecewise.
3.13 wire connection:
3.13.1 wire connection requirements:
The goal was to make the connection of the wire connection of the minimum contact resistance, mechanical strength and dielectric strength are reduced. Connection should distinguish between phase line and neutral line, protect the earth. To distinguish the method is: use the skin color of insulated wires, using the instrument testing and marking to the number, confirmed rear can be connected.
3.13.2 wire connection method:
Please see section 3, 8, 3.8 the relevant content.
3.13.3 line inspection and insulating shake please see 3 to 8, the related content of section 3.11.
4 quality standards
4.1 ensure projects:
4.4.1 of the specifications of the wire and metal trough must comply with the design requirements and relevant rules.
Between 4.1.2 wires and wire to ground insulation resistance value must be greater than 0.5 M Ω.
Inspection method: to observe the inspection, measuring inspection.
4.2 the basic items:
2 trough installation:
Slot should be close to the surface buildings, fixation, horizontal flat vertical, reasonable layout, cover board without the newborn, neat interface closely, turn the corner, corner, t-shaped connection, connection correct sealed, trough and pollution-free.
Inspection method: to observe the examination.
4.2.2 support and hanger installation:
Available expansion bolted or welded metal stents and hanger, also can use the universal fixture fixed trough, support and hanger should be reasonable arrangement, fixed firmly, flat and level.
Inspection method: to observe the examination.
Holdings line protection:
Line across the beam, wall, floor, such as slot should not be put to death on the buildings; Across the trough bottom building deformation joints should be disconnected, lead and protect the earth shall leave compensation allowance; Trough closely connect with electrical appliances, the conductor is no leakage phenomenon.
Inspection method: to observe the examination.
4.2.4 wire connection:
Connection is firm, bandage tightly, insulation good, does not hurt wire core, joint should be set up within the appliances or junction box, no joint in the slot.
Inspection method: to observe the examination.
4.3 allowable deviation projects:
Trough horizontal or vertical laying straight line part of the flat degree and the verticality deviation should not be allowed more than 5 mm.
Test method: the amount of messenger wire, wire, feet.
5 finished product protection
5.1 installation of metal trough and slot wiring, should pay attention to keep the walls clean.
After completion of 5.2, welding, package, junction box cover, complete trough plate should be plain, not very miss, wires are not allowed to bare online slot, and prevent the damage and pollution trough.
5.3 wiring is complete, may not be oil spray and brush. In order to prevent the pollution of wiring and electrical appliances.
5.4 using high stools, be careful not to touch the bad building walls and doors and Windows, etc.
6 should pay attention to the quality problem
6.1 support and hanger fixed not firm, the main reason is that the metal expansion bolt nut is not tight, or open welding welding parts, should be timely. Tighten nut on the bolt, will open the welding place to weld. Metal expansion bolt not firm, or to eat too much so deep into the wall or the wall, borehole deviation caused by loose, should be timely repair.
Spot welding with 6.2 scaffolding hanger do anticorrosive processing, should be timely fill brush missing antirust paint.
6.3 protection of ground wire diameter and the diameter of the screw pressure does not conform to the requirements, shall all be performed according to the requirements of specification.
6.4 trough when through the deformation cracks of the building did not processing, deformation cracks slot should be disconnected backplane, and fixed it in the ends of the deformed joints, protection of ground wire and cable with compensation allowance.
6.5 trough summer-planting not level, the slot cover has broken, trough and the pipe joint burning mouth broken omissions, dark apply trough did not have the access manhole. Should be adjusted to be perfect.
6.6 wire connection, the wire core is damaged, winding turns and multiples do not conform to the requirements of the regulations, rinse tin is not full, insulation bandaging is not tight, should be in accordance with the requirements of the wire connection to wire connection.
Conductor is placed within the 6.7 trough desultorily, wire should be smooth straight, and tie them into beam.
6.8 shaft wiring did not fall prevention measures, should be fill do as requested.
6.9 lines of different voltage grade, laying on the same line groove, should be separated.
6.10 cutting steel structure or light steel keel, should take remedial measures in time, carries on the repair welding reinforcement.
7 quality records
7.1 metal trough and insulated wire products factory certificate.
7.2 metal trough wiring installation engineering, self-inspection, mutual inspection records.
7.3 design changes regarding the record, record drawings.
7.4 metal trough subentry engineering quality inspection records. (times trough board wiring table)
7.5 the electrical insulation resistance.
1 scope
The technology standard is applicable to building metal trough wiring installation project.
2 construction preparation
2.1 material requirements:
2.1.1 metal trough and its accessories: finalize the design product through galvanized processing should be adopted. Its model, specification should comply with the design requirements. Slot should be smooth level off, both inside and outside edges, should not be distorted, become warped edge, such as deformation phenomenon.
2.1.2 insulated wires, it must comply with the design requirements, specifications, and product certification.
2.1.3 screw connection button: suitable for aluminum conductor under 6 was crimping. When choose, should choose according to conductor cross section and wire number corresponding models of spiral wire reinforced insulation steel shell button.
2.1.4 LC secure line pressing cap for requirement, please see 2 -- 8, 2.1.5 related content.
2.1.5: casing pipe copper tube, aluminum and copper aluminum transition casing pipe three, when should be the same as the material of the wire, and specifications corresponding casing.
2.1.6 metal bolts: should choose according to the allowable tension and shear.
2.1.7 terminal (wiring nose) : when choose, should according to the number of conductor cross section and the corresponding specifications of the terminal.
2.1.8 galvanized material: steel, round steel, flat steel, Angle steel, bolt, nut, screw, washer, spring cushion when doing electrical components, metal materials should be treated with galvanization.
2.1.9 auxiliary materials: drilling, welding electrode, oxygen, acetylene gas, mixed paint, solder, flux, rubber insulating tape, plastic insulation tape and black tape, etc.
2.2 the main equipment:
2.2.1 pencil, tape measure, line drop, cord bag, tin pan, burner.
2.2.2 electrician tools, hand electric drill, impact drill, megohm meter, multimeter, tool bag, toolbox, high stool, etc.
2.3 operation conditions:
2.3.1 fit the structure of the civil construction, reserved holes, embedded iron and embedded derrick, hanger, etc is complete.
2.3.2 ceiling and metope of shotcrete, paint and wallpaper, after the completion of all before the slots to trough installation and wiring.
2.3.3 high-rise buildings in the shaft construction wet homework is complete.
2.3.4 ground trough should cooperate with civil engineering construction in a timely manner.
3 operation process
3.1 process:
3.2 play line positioning: according to the blueprints to determine into line, box, box, cabinet and other electrical appliance installation location, from beginning to end (after the first main feeder) looking for a good horizontal or vertical line, with a chalk line bag along the walls, ceiling, and the place such as the ground, in the line of the centerline of elastic line, according to the regulations of the design requirements and construction acceptance specifications, always span mark location and a pen.
3.3 reserved holes: according to the drawings with the axis of the site, the precast processed wood or iron frame, fixed in the position of mark, and straightening is find, for cast-in-situ concrete template is dismantled, remove the framework, and smoothing mouth hole (the hole), please.
3.4 support and hanger installation requirements and buries the derrick, hanger.
3.4.1 track support and hanger installation requirements:
3.4.1.1 support and hanger steel should be straight, no significant distortion. After blanking length deviation should be within the scope of the 5 mm, incision should be no edge, burr.
3.4.1.2 steel support and hanger should be welded firmly, no significant deformation and uniform weld formation and weld length should comply with the requirements, shall not appear crack, bite edge, porosity, cave, leakage welding, welding defects such as leakage.
3.4.1.3 support and hanger should be installed firmly, to guarantee the horizontal even vertical, mounting bracket on the slope of building and hanger should be the same as the building has a slope.
3.4.1.4 support and hanger of the specifications of the general should not be less than the flat iron 30 mm * 3 mm; Flat steel 25 mm * 25 mm * 3 mm.
3.4.1.5 it is forbidden to use welding cutting steel structure or any part of the light steel keel, all should do the anti-corrosion treatment after welding.
3.4.1.6 universal sling finalize the design product, should be adopted to lifting of slot, and should have a separate lifting fixture or support system.
3.4.1.7 fixed protection/anchors spacing generally should not be greater than l. 5 ~ 2 m. In turn in and out of the box, box, cabinet, corner, and both ends of deformation cracks and t-joint three-terminal fixed support point shall be set up within 500 mm.
3.4.1.8 support and hanger distance of the upper floor should not be less than 150 ~ 200 mm; Apart from the ground height should not be less than 100 ~ 150 mm;
3.4.1.9 it is forbidden to use the brackets and cradles for the wood block.
3.4.1.10 light steel keel laying trough should have their own separate assembly fixture or support system, derrick diameter should not less than 5 mm; Support should be fixed on the main keel, should not be fixed on the auxiliary keel.
3.4.2 embedded derrick, hanger:
Adopts the round steel not less than 5 mm in diameter, after cutting, straightening, simmer bending, welding steps into a boom, hanger, etc. Department of port shall be tapping for adjustment. In cooperate with civil structure, should be as on steel reinforcement at the same time, the derrick or pylon anchorage marked in a fixed position. In concrete pouring, with care to prevent the boom or displacement of the frame. Shuttering shall not be damaged when the boom end of thread.
3.5 embedded iron home-made processing should not be less than 120 mm x 60 mm x 6 mm; The anchoring round steel should not be less than 5 mm in diameter. Will closely cooperate with civil engineering structure construction, embedded iron flat steel mesh piece below, close to the template, binding or welding method can be used to anchor bar in the reinforced online. Template is dismantled, embedded iron plane should be bare, or eat into depth is in commonly 10 ~ 20 mm, then made of plates or Angle bracket, hanger welding fixed on it.
3.6 steel structure: stents or hanger can be directly welded on the steel structure of fixed location. Also can use a universal sling for installation.
3.7 metal expansion bolt installation
3.7.1 metal expansion bolt installation requirements
3.7.1.1 suitable for C5 above concrete member and solid brick wall, does not apply to the hollow brick wall.
3.7.1.2 hole diameter of the error must not exceed + 0.5 ~ 0.5 mm; Depth error must not exceed + 3 mm; After drilling, hole residual debris removal shall be clean.
3.7.1.3 bolt, after their head deflection value should not be greater than 2 mm.
3.7.1.4 bolt and the quality of the casing shall be in accordance with the technical conditions of the product.
3.7.2 metal expansion bolt installation method
3.7.2.1 first along the walls and roof according to the design of elastic line positioning, mark the location of the fixed point.
3.7.2.2 according to scaffolding hanger under load, select the corresponding metal expansion bolt and drill bit, the selected bit length should be greater than the length of the casing.
3.7.2.3 perforating depth should be buried all casing wall or roof, it is advisable to performance level.
3.7.2.4 should be cleared to play a good hole in the debris, and then use wooden hammer or after mat wood, the expansion bolt with the hammer to knock into the hole, should guarantee the casing surface is flush with the architecture, the bolt end are exposed, shall not damage the bolt thread tapping.
3.7.2.5 buried after good bolt, nut available with corresponding gasket will support or hanger directly fixed on the metal bolts.
3.8 trough installation:
3.8.1 trough installation requirements:
3.8.1.1 trough should level off, without distortion, no burr inside, complete all kinds of accessories.
3.8.1.2 trough interface should level off, juncture place should be tight straight. Slot cover mount should level off, without a newborn, outlet position accurately.
3.8.1.3 laying in the ceiling, if the ceiling can't person manhole shall be maintained.
3.8.1.4 through the walls of the trough are not allowed to be together with the holes on the wall with death.
3.8.1.5 trough all non conductive part of the iron shall be connected and jumper, make it become a conductor in a row, and completes the whole earth.
3.8.1.6 when the trough bottom of distance is less than 2.4 m, slot itself and the trough plate must be equipped with ground protection. 2.4 m above the ground slot cover plate without protection.
3.8.1.7 trough after the structure of the deformation cracks, expansion joints and settlement joints, slot itself should be disconnected, groove with overlapped connection plate, don't need to be fixed. Protect the earth wire and wire groove are compensation allowance shall be maintained.
3.8.1.8 equipped in the shaft, the place such as condole top, channel, mezzanine and equipment layer of trough should comply with the (code for fire protection design of tall buildings fire protection requirements (GB50045-95).
3.8.2 trough installation to install
3.8.2.1 trough straight segment connection should use connecting plate, washer, spring washer, nut fastening, summer-planting place should be closely flush.
3.8.2.2 trough the intersection, turn, t-shaped connection, should use single-pass, two-way, tee, four-way or plane two-way, such as graphic tee for flexible connection, wire junction terminal block should be set up or wire connector is placed within the electrical appliances.
3.8.2.3 trough and the summer-planting such as box, box, cabinet, BaoJiao should be adopted into the line and the place such as outlet connections, and screw fastening, terminal shall be equipped with seal.
3.8.2.4 building surface, such as slope, slot should change with the slope. After being all wiring duct laying out, should be adjusted to check before wiring. After confirm qualified, and then to slot wiring.
Lifting wire slot 3.9:
Universal sling commonly used in steel structure, such as i-beam, Angle steel, light steel keel structure, can advance will sling, fixture, derrick, hoisting device assembled into a whole, in place of mounting position for lifting, one by one to lifting fixture on the steel structure, pressure will be top wire turns into prison.
3.9.1 trough line segment assembly, main should do first, then do branch line, the hoisting apparatus and the trough place card together with butterfly, according to this method, the trough is presented.the assembly forming.
3.9.2 trough to trough can be used in the connection head or outside connection, with flat pads and trampoline with nut fastening.
3.9.3 trough cross, t-shaped cross, two-way, tee, four-way, have to be adopted to connect, wire connection should be set up joint cassette in electrical appliances, wire slot is absolutely not allowed to have a wire connector.
3.9.4 turning parts should be made on the elbow and her elbow, appropriate to installation Angle.
3.9.5, outlet place should use the outlet box are connected, the end part to mount seal, in the outlet and inlet line of box, box, cabinet BaoJiao connection should be adopted.
3.10 the ground trough installation:
Slot on the ground, when installation should cooperate with civil ground engineering construction in a timely manner. The flatness pattern is different, first sight, and then determine the position fixed point, will good lie bolt and clamp slot placed on the bed, then the slot connection. Such as trough and pipe connection; The slot connected to the junction box; Junction box connected to the pipe; The slot outlet connection; Slot end processing, etc., should be installed, screw fastening. All good ground trough and accessories, and then conduct a system adjustment, mainly according to the thickness of the ground, adjust the slot lines carefully, branch lines, cable box joint, turning, the place such as corner, export, flush with the ground level height requirement, various lifted the lid cover into sealed, in order to prevent the cement mortar, until the end of the civil engineering construction on the ground.
3.11 trough in protecting ground installation:
3.11.1 protect earth wire should be laying online groove side according to design requirements, meet is located in the screw diameter should not less than 6 mm; And the need to add flat washer and spring washer, and nut firm pressure.
3.11.2 the width of the metal trough within 100 mm (100 mm), two trough using connection plate joint (i.e., when doing ground connection plate), each end screw fixed point of not less than 4; Width is more than 200 mm (200 mm) with two ends groove to protect each end of ground screw fastening point of the connection plate connection not less than 6.
3.11.3 trough plate protective earthing requirements see article 10.4.7.
3.12 line slot wiring
3.12.1 trough inside wiring requirements
3.12.1.1 line slot before wiring should eliminate trough of water and dirt.
3.12.1.2 within the same trough (including insulation) cross-sectional area of the combined should not exceed 40% of the internal area.
3.12.1.3 trough bottom downward wiring, branch wire shall be binding with nylon tie belt of bundles, respectively, and the fixed online slot under the floor, in case the wire down.
3.12.1.4 different voltage, different circuit, different frequency of the wire slot should add partition on the same line. The following circumstances, can be directly put inside with a trough: voltage 65 v and below: the same equipment or the same assembly line of the drive and control circuit; All circuits of lighting lanterns; Lighting circuit of three phase four wire system.
3.12.1.5 conductor is large, besides using wire sheath color to distinguish the phase sequence, can also use the wire end and turning on the method of marking to distinguish.
3.12.1.6 when crossing the deformation cracks of the building, wire compensation allowance shall be maintained.
3.12.1.7 terminal box wiring reserve should not be more than 15 cm in length; Plate, the length of conductor is reserved in the cabinet shall be 1/2 of its circumference.
3.12.1.8 from introducing outdoor, indoor wires through the wall of a rubber insulated wire should be adopted, not allowed to use plastic insulated wire. The outer edge of the wall protection tube should be waterproof measures.
3.12.2 trough inside wiring methods:
3.12.2.1 cleaning trough:
When cleaning the Ming fu trough, usable dishcloth net residual impurities and swelling in the slot, the slot inside and outside clean; Apply cleaning the shadow on the ground in the trough, can will take first line through to the outlet, and then take cloth tied to the line end, on the other side to pull cloth, repeatedly can clean up the debris and water within the slot. Also can use air compressor to blow out impurities and water in the trough.
3.12.2.2 pay-off pay-off should first check before: (a) junction between tube and the slot to protect the mouth is complete; The choice of wires and protecting the earth is in line with the design requirements; Root tube into the box inside and outside the mother whether lock, pay-off again after confirmed. (b) the feeding method: first will straighten wires, sequence, into the circle or on the pay-off stand (car), from the beginning to the end (regional) after trunk line, first put while finishing, should not appear extrusion back clasp, kink, the phenomenon such as damage wire. Each branch should tie beam, nylon banding tape should be used when binding, are not allowed to use metal wire binding. (c) the ground trough pay-off: use belt line from the outlet end to the other end, will lead release, straighten, sequence, stripped end insulation layer, and tags, then bring conductor bundle in online, and then can be drawn from the other end. Pay-off should be piecewise.
3.13 wire connection:
3.13.1 wire connection requirements:
The goal was to make the connection of the wire connection of the minimum contact resistance, mechanical strength and dielectric strength are reduced. Connection should distinguish between phase line and neutral line, protect the earth. To distinguish the method is: use the skin color of insulated wires, using the instrument testing and marking to the number, confirmed rear can be connected.
3.13.2 wire connection method:
Please see section 3, 8, 3.8 the relevant content.
3.13.3 line inspection and insulating shake please see 3 to 8, the related content of section 3.11.
4 quality standards
4.1 ensure projects:
4.4.1 of the specifications of the wire and metal trough must comply with the design requirements and relevant rules.
Between 4.1.2 wires and wire to ground insulation resistance value must be greater than 0.5 M Ω.
Inspection method: to observe the inspection, measuring inspection.
4.2 the basic items:
2 trough installation:
Slot should be close to the surface buildings, fixation, horizontal flat vertical, reasonable layout, cover board without the newborn, neat interface closely, turn the corner, corner, t-shaped connection, connection correct sealed, trough and pollution-free.
Inspection method: to observe the examination.
4.2.2 support and hanger installation:
Available expansion bolted or welded metal stents and hanger, also can use the universal fixture fixed trough, support and hanger should be reasonable arrangement, fixed firmly, flat and level.
Inspection method: to observe the examination.
Holdings line protection:
Line across the beam, wall, floor, such as slot should not be put to death on the buildings; Across the trough bottom building deformation joints should be disconnected, lead and protect the earth shall leave compensation allowance; Trough closely connect with electrical appliances, the conductor is no leakage phenomenon.
Inspection method: to observe the examination.
4.2.4 wire connection:
Connection is firm, bandage tightly, insulation good, does not hurt wire core, joint should be set up within the appliances or junction box, no joint in the slot.
Inspection method: to observe the examination.
4.3 allowable deviation projects:
Trough horizontal or vertical laying straight line part of the flat degree and the verticality deviation should not be allowed more than 5 mm.
Test method: the amount of messenger wire, wire, feet.
5 finished product protection
5.1 installation of metal trough and slot wiring, should pay attention to keep the walls clean.
After completion of 5.2, welding, package, junction box cover, complete trough plate should be plain, not very miss, wires are not allowed to bare online slot, and prevent the damage and pollution trough.
5.3 wiring is complete, may not be oil spray and brush. In order to prevent the pollution of wiring and electrical appliances.
5.4 using high stools, be careful not to touch the bad building walls and doors and Windows, etc.
6 should pay attention to the quality problem
6.1 support and hanger fixed not firm, the main reason is that the metal expansion bolt nut is not tight, or open welding welding parts, should be timely. Tighten nut on the bolt, will open the welding place to weld. Metal expansion bolt not firm, or to eat too much so deep into the wall or the wall, borehole deviation caused by loose, should be timely repair.
Spot welding with 6.2 scaffolding hanger do anticorrosive processing, should be timely fill brush missing antirust paint.
6.3 protection of ground wire diameter and the diameter of the screw pressure does not conform to the requirements, shall all be performed according to the requirements of specification.
6.4 trough when through the deformation cracks of the building did not processing, deformation cracks slot should be disconnected backplane, and fixed it in the ends of the deformed joints, protection of ground wire and cable with compensation allowance.
6.5 trough summer-planting not level, the slot cover has broken, trough and the pipe joint burning mouth broken omissions, dark apply trough did not have the access manhole. Should be adjusted to be perfect.
6.6 wire connection, the wire core is damaged, winding turns and multiples do not conform to the requirements of the regulations, rinse tin is not full, insulation bandaging is not tight, should be in accordance with the requirements of the wire connection to wire connection.
Conductor is placed within the 6.7 trough desultorily, wire should be smooth straight, and tie them into beam.
6.8 shaft wiring did not fall prevention measures, should be fill do as requested.
6.9 lines of different voltage grade, laying on the same line groove, should be separated.
6.10 cutting steel structure or light steel keel, should take remedial measures in time, carries on the repair welding reinforcement.
7 quality records
7.1 metal trough and insulated wire products factory certificate.
7.2 metal trough wiring installation engineering, self-inspection, mutual inspection records.
7.3 design changes regarding the record, record drawings.
7.4 metal trough subentry engineering quality inspection records. (times trough board wiring table)
7.5 the electrical insulation resistance.
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