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Maintenance and installation
Maintenance and installation
Lighting lines that are lighting and other electrical equipment and power supply control and control of the line. Power supply voltage, generally single-phase 220V two-wire system, the load is large, with 220 / 380V three-phase four-wire system.
1 lighting line installation
1.1 General technical requirements for lighting lines
Lighting lines of various wiring methods, should meet the use, safe, reasonable and reliable requirements.
1.1.1 indoor and outdoor wiring, should use the voltage of not less than 500V insulated wire. Single-phase or two-phase three-wire power supply, the zero line and the same phase cross-section; three-phase four-wire power supply zero line section should not be less than 1 /
1.1.2 In addition to lanterns and wall lamps and other lines, the general lighting of each branch of the maximum load current should not exceed 15A, the number of receptacles is generally not more than 20; electric wire for each branch of the maximum load current should not exceed 30A; The number of receptacles is generally no more than 6.
1.1.3 cabling process, should try to reduce the connection between the wires to reduce the point of failure. Where in the tube, the wood within the board of the wire, are not allowed to have joints of the branch. The wire connections and branches shall not be subjected to mechanical forces.
1.1.4 The line should be as far as possible to avoid heat and not on the surface of the fever laying.
1.1.5 wire and electrical connection to the compact compaction, and strive to reduce the contact resistance and prevent falling off.
1.1.6 The location of the various bright wiring, should be easy to check and repair. Line horizontal laying, the distance from the ground should not be less than 2.5m, vertical laying should not be less than 1.8m. If the laying of individual lines below 2.5m, the vertical laying of less than 1.8m, should wear pipe or take other protective measures.
1.1.7 each branch of the line between the wire and the insulation resistance should not be less than 0.5MΩ, less than 0.5MΩ, the AC 1000V pressure test should be done.
1.1.8 The following places should be used metal pipe wiring
1) important place of activity.
2) Locus where there is flammable, explosive danger.
3) important warehouse.
1.1.9 Corrosive site wiring, should be used plastic products, all joints should be sealed.
1.1.10 cold storage wiring, should adopt the jacket line with the use of the lighting voltage should not exceed 36V, all control equipment located outside the library.
1.1.11 The following places should be used for indoor and outdoor wiring
1) important place of activity.
2) important control circuit and secondary line.
3) Move the wire.
4) Particularly humid places and severely corrosive places.
5) lines associated with violent vibrating electrical equipment.
6) other places with special requirements.
1.2 should pay attention to the installation of lighting equipment matters
1.2.1 General lighting should be used not more than 250V to ground voltage.
1.2.2 plant lighting from the ground height of not less than 2.5m, below this height, should be protected. At the same time in addition to the safety voltage, shall not use the switch with the lamp port, and are not allowed to wire directly welded to the light bulb contacts, the use of screw head, copper mouth shall not be exposed.
1.2.3 The local lighting used in line lamps and machine tables shall not exceed 42 V in voltage and shall not exceed 12 V when working in particularly wet locations or in metal containers.
1.2.4 The lighting fixtures used in flammable, explosive, dusty, humid and corrosive atmospheres shall meet their specific requirements.
1.2.5 lighting should be used when the safety voltage, should be used to separate the secondary winding transformer, not allowed autotransformer.
1.2.6 line lights must be with an insulated handle and protective net cover, prohibit the use of general lights, handle the wire should be insulated casing protection.
1.2.7 a variety of lighting, according to the needs of the work should be a certain form of condenser equipment, not with paper, iron, etc. instead, not allowed to use wire at the mouth of the bundle.
1.2.8 When installing outdoor lighting, if the height is less than 3m, should be added protective equipment, and should try to prevent the wind caused by shaking.
1.3 lighting lines of the laying of the way
Commonly used circuit laying methods, useful porcelain plywood, porcelain beads, insulators, wood chute, steel pipe, plastic pipe and aluminum foil and other wiring.
What kind of device wiring should be used, depending on the use of the line, the environmental conditions of the wiring site, installation and maintenance conditions and safety requirements and other factors. Made safe and affordable, economical and easy to repair.
1.3.1 porcelain plywood wiring, for the smaller load of dry places, such as office, residential and so on.
1.3.2 Porcelain-Porcelain Welds for dry or humid places with large loads, such as public places, production workshops, kitchens and so on.
1.3.3 Insulator wiring, for the larger load, long lines of dry or wet places, such as production plants, bathrooms, laundry and so on.
1.3.4 wood slot board wiring, for the smaller load, requiring a clean and tidy clean place. In addition, it is also commonly used as a protective device for vertical laying along the wall as a porcelain plate.
1.3.5 Steel pipe wiring, for easy damage to the wire, fire or explosion hazard. Steel pipe used for the requirements of clean and beautiful place, the ground power equipment lines are often used in the pipeline laying under the ground.
1.3.6 plastic pipe wiring, for corrosive but no explosion and mechanical damage to the place, such as chemical plants and so on.
1.3.7 aluminum foil card wiring, for the smaller load of dry non-corrosive gas sites, commonly used as weak lines of wiring, when the line voltage of 220V and 380V, you must use the jacket with insulated wire.
1.4 lighting line laying requirements
1.4.1 porcelain plywood wiring requirements
(1) The conductor and the building shall be horizontal and vertical and shall not be in contact with the building. Line level laying, the conductor distance from the ground is generally not less than 2.5m; vertical laying of the line, such as from the ground height of less than 1.8m line, should be added protective device.
(2) in the line in the assembly of the switch, lampholders and hanging boxes and other electrical appliances on both sides of the 50mm or less, should be installed to clamp the fixed wire.
(3) porcelain plywood can not be screwed on a solid foundation, such as plastering, reed foil and so on.
(4) porcelain plywood, not in the ceiling and other shelter laying.
(5) Straight line porcelain plywood spacing and porcelain plywood specifications: 40mm long two-line and 64mm long three-wire porcelain plywood spacing, not more than 600mm; 51mm long two-wire and 76mm long three-wire porcelain plywood spacing, Not more than 800mm.
(6) wire through the wall must be used porcelain (or other insulation tube) to be protected, in the line branch, cross and corner, the wire should not be the role of mechanical force, and should be installed porcelain plywood, wire and wire should be Insulation tube isolation.
1.4.2 ceramic beads wiring requirements
(1) the wire should be horizontal and vertical, not in contact with the building. When the line is laid horizontally, the height of the conductor should not be less than 2.5m. Vertical laying of the line, at a distance of less than 1.8m from the line, should be added protective device.
(2) according to the size of the cross-section of the wire, with the corresponding ceramic beads and tie.
(3) wire must be wrapped with yarn package core line (not with bare lead wire) firmly tied to the porcelain beads. Force the porcelain beads with double tied method; plus porcelain beads with a single binding method; terminal beads to the wire tied back to the wire should be tied to the same side of the porcelain beads.
(4) line branch, cross and corner, between the wire and the wire should be fitted with porcelain casing or other insulation tube isolation.
(5) lines in the assembly of the switch, socket and lamps near the vicinity of about 100mm, should be installed porcelain beads to fix the wire.
(6) the location of twisted beads, if the brick or concrete foundation, should be reserved for wood bricks; if plastering ceiling, should add wood keel. Line in the wall to be better than the wall, under the casing or in the wall when the reserved casing.
(7) with ceramic beads dark wiring, the line should be easy to repair and replacement.
1.4.3 laying requirements for insulator cabling
(1) wire to be laid neatly, and not with the building contact (the inner conductor from the wall is generally 10mm ~ 15mm). Lines are generally horizontal laying, the distance from the ground should not be less than 3m.
(2) the distance from the wire to the grounding object shall not be less than 30mm.
(3) insulator laying insulated wire, copper core section shall not be less than 1.5mm2, aluminum core line shall not be less than 2.5mm2.
(4) The wire must be tied to the insulator with a yarn wrap. Wire horizontal laying in the insulator wall side of the neck tank; wire vertical laying in the top of the insulator above the top slot; line in the corner of the local wire should be tied to the opposite side of the tension; terminal insulator with "back to the banding method."
(5) Insulators should be securely mounted on brackets and buildings. Such as fixed in the wood structure, can be screwed directly into the straight foot; such as fixed on the metal structure, the first punch with iron pole straight insulator piercing fixed.
(6) wire from the insulator line lead to the power supply equipment, the general use of plastic pipe or steel pipe with clear, wire connection, should be carried out in the vicinity of the insulator.
1.4.4 laying requirements for wood trough wiring
(1) wood groove board to be made of dry wood, the tank should be painted insulating oil, and the building contact with the bottom to be coated with anti-corrosion oil, the outer surface of the tank should be painted with color paint.
(2) Insulated conductors with a withstand voltage of 500V shall be used and the cross-section shall not exceed 4 mm2.
(3) within each trunking, can only lay a wire. The wire in the tank is not allowed to have a connector, such as the need to connector, use the terminal box buckle in the slot board.
(4) wooden trough plate to be installed in a horizontal and vertical, neat and beautiful, fixed and reliable, according to the shape of the building bending and close.
(5) the wooden plate of the straight line connection, the end of the interface with the cover can not be together, to stagger 30mm, the joints made oblique, in the "d" and the angle of the connection at 45 ° angle joint, the terminal to seal The
(6) wood chute and switch, socket and lamps used to connect the wooden table, the use of hollow wood, the first side of the wooden side to dig a gap, and then buckle on the wooden board.
(7) Wooden slabs may be fixed to wooden structures or ceilings with wooden screws or nails. If they are fixed along a brick or concrete wall, the wooden wedge may be fixed to the wall and then the wooden groove shall be nailed to the wooden wedge The
Timber board requirements:
Base plate fixed distance: 30mm end; the middle of 600mm
Cover plate fixed distance: the end of 60mm; the middle 450mm
1.4.5 laying requirements of steel pipe wiring
(1) steel pipe and its accessories should be able to anti-corrosion, Ming Tu set when the brush anti-corrosion paint, dark laying with concrete protection.
(2) between the connection between the steel pipe and the junction box are required to be connected into a conductive overall welding ground wire, that is, with a diameter of 4mm galvanized iron wire welding or with two diameter 2mm galvanized iron wire in each pipe wrapped around 5 Circulation after soldering.
(3) the diameter of the steel pipe to be smooth, no clogging, no loopholes, the joints should be close.
(4) bending radius of the steel pipe bend shall not be less than 6 times the diameter of the pipe; buried in the dark set of 10 times; the angle of each bend can not be less than 90 °. When the pipeline through the building expansion joints, in order to prevent the base sinking uneven, damage to the pipe and wire, to be installed in the expansion joints compensation box.
(5) The total cross-sectional area of the wire (including the insulating layer of the conductor) shall not be greater than 40% of the cross-sectional area of the inner diameter of the pipe; the pipe wire is not allowed to be connected and twisted.
(6) When the steel pipe is embedded in the reinforced concrete slab, the diameter of the steel pipe shall not exceed 1/3 of the thickness of the concrete slab; the coking slag shall be buried in the steel pipe, and the cement mortar Protection, and then lay the coke slag layer; buried in the underground soil must use thick-walled steel pipe, pipe wall and welding ground at the need to brush asphalt corrosion.
(7) wire through the tube, the same circuit of the phase of the wire, regardless of the number of root, should penetrate a tube; different circuits and different voltage lines, not allowed to wear in a tube; AC and DC line Do not wear in the same tube, a phase wire is not allowed to penetrate the steel pipe alone.
(8) the steel pipe in the wall of the fixed, when the pipe diameter of 20mm below the pipe card and the distance between the card should not be greater than 1.5m; pipe diameter below 40mm, the tube card distance should not be greater than 2.5m; When the diameter exceeds 40mm, it can be increased to 3.5m.
(9) steel pipe into one, should be grounded or connected to zero.
(10) When the laying of steel pipe exceeds the following length, the junction box or junction box shall be installed in the middle:
1) When the length of the tube exceeds 30 m and there is no bending;
2) When the length of the tube exceeds 20 m and there is a bend;
3) When the length of the tube is more than 12 m and there are two bends;
4) When the length of the tube is more than 8 m and there are three bends.
1.4.6 plastic pipe wiring requirements
(1) plastic pipe wiring and pipe wiring is basically the same. The use of the annex should also be plastic products, but also because the plastic pipe mechanical strength is low, buried in the wall when the application of cement mortar protection, under the ground, the application of concrete protection.
(2) the connection of plastic pipe can be inserted with the method, insert the first method is a plastic pipe with the end of the furnace baking heating softening (be careful not to leave the fire too close to avoid burning pipe), and then put Another plastic tube can be inserted into about 30mm.
(3) plastic pipe bending, can be baked in the fire heating, soften slowly after bending, if the larger diameter can be filled in the first tube of heated sand, and then heated plastic pipe bending, bending radius of not less than 6 times the diameter of the pipe at the bend should not be bent, so as not to affect through the wire.
(4) When the plastic pipe along the wall laying, the fixed point between the diameter of 20mm or less, the tube spacing should not be greater than 1m; diameter of 40mm or less, not more than 1.5m, diameter 50mm and Above, can be increased to 2m.
1.4.7 aluminum foil card laying requirements
(1) The wire is horizontal and vertical, and is flat with the building.
(2) the supply voltage of 220V or 380V line, the horizontal laying time is generally not less than 2.5m; vertical laying not less than 1.8m, less than 1.8m of the line, should be added protective equipment (such as plastic pipe ).
(3) when the circuit through the wall, should be installed casing protection.
(4) 220V and 380V line connector, should be carried out in the aluminum junction box.
(5) the distance between the aluminum card is generally not more than 300mm. Switches, sockets, lamps or junction boxes, etc., should be nailed an aluminum card. At the same time, switches, sockets, lamps and junction boxes, etc., should be left out of the thread in order to connect.
2 lighting line operation and maintenance
Before the operation of the lighting line should be carried out, should be carefully checked and accepted, and the establishment of equipment technology management files, indicating the specification and load name, after the operation and maintenance fill in the relevant inspection items, such as load conditions, insulation, defects, Master the operation of the line. On the roof of the lighting line should be inspected once a year inspection and maintenance time; line power outage time more than a month before re-transmission, should be patrol inspection, and insulation resistance. Lighting line inspection inspection of the contents are:
2.1 Check whether the wires and buildings are rubbing and rubbing, whether the insulation is damaged, whether the insulation support is off or not.
2.2 workshop bare wire phase and the distance between the line is the same distance, bare wire protection network (board) and bare wire distance is required, if necessary, adjust the distance between the wire and the wire and the ground.
2.3 Where is the laying of the wire and the trough, etc. whether there is cracking, injury, the steel pipe is good. Check the insulator, porcelain beads, wire crossbar, metal plate support state, if necessary, to be repaired.
2.4 Steel pipe and plastic pipe waterproof elbow with or without the phenomenon of wire rubbing the nozzle.
Plastic pipes laid under the ground above 2.5 without heavy backlog or collision.
2.6 whether the conductor has a long-term overload phenomenon, the wire connection point is good, there is no overheating.
2.7 should always check the zero line circuit of the connection point of contact is good, there is no corrosion or disengagement.
2.8 if the line is connected with the unqualified or other electrical equipment not allowed, there is a temporary line.
2.9 measure insulation resistance, in the wet workshop, corrosive gas, steam house, measure every year more than two times, the insulation value shall not be less than 500 ohms per volt working voltage; drying workshop, measure every year once per volt voltage insulation resistance value shall not be less than 1000.
2.10 check all kinds of signs and warning signs are complete, check whether the fuse is appropriate and complete.
1 lighting line installation
1.1 General technical requirements for lighting lines
Lighting lines of various wiring methods, should meet the use, safe, reasonable and reliable requirements.
1.1.1 indoor and outdoor wiring, should use the voltage of not less than 500V insulated wire. Single-phase or two-phase three-wire power supply, the zero line and the same phase cross-section; three-phase four-wire power supply zero line section should not be less than 1 /
1.1.2 In addition to lanterns and wall lamps and other lines, the general lighting of each branch of the maximum load current should not exceed 15A, the number of receptacles is generally not more than 20; electric wire for each branch of the maximum load current should not exceed 30A; The number of receptacles is generally no more than 6.
1.1.3 cabling process, should try to reduce the connection between the wires to reduce the point of failure. Where in the tube, the wood within the board of the wire, are not allowed to have joints of the branch. The wire connections and branches shall not be subjected to mechanical forces.
1.1.4 The line should be as far as possible to avoid heat and not on the surface of the fever laying.
1.1.5 wire and electrical connection to the compact compaction, and strive to reduce the contact resistance and prevent falling off.
1.1.6 The location of the various bright wiring, should be easy to check and repair. Line horizontal laying, the distance from the ground should not be less than 2.5m, vertical laying should not be less than 1.8m. If the laying of individual lines below 2.5m, the vertical laying of less than 1.8m, should wear pipe or take other protective measures.
1.1.7 each branch of the line between the wire and the insulation resistance should not be less than 0.5MΩ, less than 0.5MΩ, the AC 1000V pressure test should be done.
1.1.8 The following places should be used metal pipe wiring
1) important place of activity.
2) Locus where there is flammable, explosive danger.
3) important warehouse.
1.1.9 Corrosive site wiring, should be used plastic products, all joints should be sealed.
1.1.10 cold storage wiring, should adopt the jacket line with the use of the lighting voltage should not exceed 36V, all control equipment located outside the library.
1.1.11 The following places should be used for indoor and outdoor wiring
1) important place of activity.
2) important control circuit and secondary line.
3) Move the wire.
4) Particularly humid places and severely corrosive places.
5) lines associated with violent vibrating electrical equipment.
6) other places with special requirements.
1.2 should pay attention to the installation of lighting equipment matters
1.2.1 General lighting should be used not more than 250V to ground voltage.
1.2.2 plant lighting from the ground height of not less than 2.5m, below this height, should be protected. At the same time in addition to the safety voltage, shall not use the switch with the lamp port, and are not allowed to wire directly welded to the light bulb contacts, the use of screw head, copper mouth shall not be exposed.
1.2.3 The local lighting used in line lamps and machine tables shall not exceed 42 V in voltage and shall not exceed 12 V when working in particularly wet locations or in metal containers.
1.2.4 The lighting fixtures used in flammable, explosive, dusty, humid and corrosive atmospheres shall meet their specific requirements.
1.2.5 lighting should be used when the safety voltage, should be used to separate the secondary winding transformer, not allowed autotransformer.
1.2.6 line lights must be with an insulated handle and protective net cover, prohibit the use of general lights, handle the wire should be insulated casing protection.
1.2.7 a variety of lighting, according to the needs of the work should be a certain form of condenser equipment, not with paper, iron, etc. instead, not allowed to use wire at the mouth of the bundle.
1.2.8 When installing outdoor lighting, if the height is less than 3m, should be added protective equipment, and should try to prevent the wind caused by shaking.
1.3 lighting lines of the laying of the way
Commonly used circuit laying methods, useful porcelain plywood, porcelain beads, insulators, wood chute, steel pipe, plastic pipe and aluminum foil and other wiring.
What kind of device wiring should be used, depending on the use of the line, the environmental conditions of the wiring site, installation and maintenance conditions and safety requirements and other factors. Made safe and affordable, economical and easy to repair.
1.3.1 porcelain plywood wiring, for the smaller load of dry places, such as office, residential and so on.
1.3.2 Porcelain-Porcelain Welds for dry or humid places with large loads, such as public places, production workshops, kitchens and so on.
1.3.3 Insulator wiring, for the larger load, long lines of dry or wet places, such as production plants, bathrooms, laundry and so on.
1.3.4 wood slot board wiring, for the smaller load, requiring a clean and tidy clean place. In addition, it is also commonly used as a protective device for vertical laying along the wall as a porcelain plate.
1.3.5 Steel pipe wiring, for easy damage to the wire, fire or explosion hazard. Steel pipe used for the requirements of clean and beautiful place, the ground power equipment lines are often used in the pipeline laying under the ground.
1.3.6 plastic pipe wiring, for corrosive but no explosion and mechanical damage to the place, such as chemical plants and so on.
1.3.7 aluminum foil card wiring, for the smaller load of dry non-corrosive gas sites, commonly used as weak lines of wiring, when the line voltage of 220V and 380V, you must use the jacket with insulated wire.
1.4 lighting line laying requirements
1.4.1 porcelain plywood wiring requirements
(1) The conductor and the building shall be horizontal and vertical and shall not be in contact with the building. Line level laying, the conductor distance from the ground is generally not less than 2.5m; vertical laying of the line, such as from the ground height of less than 1.8m line, should be added protective device.
(2) in the line in the assembly of the switch, lampholders and hanging boxes and other electrical appliances on both sides of the 50mm or less, should be installed to clamp the fixed wire.
(3) porcelain plywood can not be screwed on a solid foundation, such as plastering, reed foil and so on.
(4) porcelain plywood, not in the ceiling and other shelter laying.
(5) Straight line porcelain plywood spacing and porcelain plywood specifications: 40mm long two-line and 64mm long three-wire porcelain plywood spacing, not more than 600mm; 51mm long two-wire and 76mm long three-wire porcelain plywood spacing, Not more than 800mm.
(6) wire through the wall must be used porcelain (or other insulation tube) to be protected, in the line branch, cross and corner, the wire should not be the role of mechanical force, and should be installed porcelain plywood, wire and wire should be Insulation tube isolation.
1.4.2 ceramic beads wiring requirements
(1) the wire should be horizontal and vertical, not in contact with the building. When the line is laid horizontally, the height of the conductor should not be less than 2.5m. Vertical laying of the line, at a distance of less than 1.8m from the line, should be added protective device.
(2) according to the size of the cross-section of the wire, with the corresponding ceramic beads and tie.
(3) wire must be wrapped with yarn package core line (not with bare lead wire) firmly tied to the porcelain beads. Force the porcelain beads with double tied method; plus porcelain beads with a single binding method; terminal beads to the wire tied back to the wire should be tied to the same side of the porcelain beads.
(4) line branch, cross and corner, between the wire and the wire should be fitted with porcelain casing or other insulation tube isolation.
(5) lines in the assembly of the switch, socket and lamps near the vicinity of about 100mm, should be installed porcelain beads to fix the wire.
(6) the location of twisted beads, if the brick or concrete foundation, should be reserved for wood bricks; if plastering ceiling, should add wood keel. Line in the wall to be better than the wall, under the casing or in the wall when the reserved casing.
(7) with ceramic beads dark wiring, the line should be easy to repair and replacement.
1.4.3 laying requirements for insulator cabling
(1) wire to be laid neatly, and not with the building contact (the inner conductor from the wall is generally 10mm ~ 15mm). Lines are generally horizontal laying, the distance from the ground should not be less than 3m.
(2) the distance from the wire to the grounding object shall not be less than 30mm.
(3) insulator laying insulated wire, copper core section shall not be less than 1.5mm2, aluminum core line shall not be less than 2.5mm2.
(4) The wire must be tied to the insulator with a yarn wrap. Wire horizontal laying in the insulator wall side of the neck tank; wire vertical laying in the top of the insulator above the top slot; line in the corner of the local wire should be tied to the opposite side of the tension; terminal insulator with "back to the banding method."
(5) Insulators should be securely mounted on brackets and buildings. Such as fixed in the wood structure, can be screwed directly into the straight foot; such as fixed on the metal structure, the first punch with iron pole straight insulator piercing fixed.
(6) wire from the insulator line lead to the power supply equipment, the general use of plastic pipe or steel pipe with clear, wire connection, should be carried out in the vicinity of the insulator.
1.4.4 laying requirements for wood trough wiring
(1) wood groove board to be made of dry wood, the tank should be painted insulating oil, and the building contact with the bottom to be coated with anti-corrosion oil, the outer surface of the tank should be painted with color paint.
(2) Insulated conductors with a withstand voltage of 500V shall be used and the cross-section shall not exceed 4 mm2.
(3) within each trunking, can only lay a wire. The wire in the tank is not allowed to have a connector, such as the need to connector, use the terminal box buckle in the slot board.
(4) wooden trough plate to be installed in a horizontal and vertical, neat and beautiful, fixed and reliable, according to the shape of the building bending and close.
(5) the wooden plate of the straight line connection, the end of the interface with the cover can not be together, to stagger 30mm, the joints made oblique, in the "d" and the angle of the connection at 45 ° angle joint, the terminal to seal The
(6) wood chute and switch, socket and lamps used to connect the wooden table, the use of hollow wood, the first side of the wooden side to dig a gap, and then buckle on the wooden board.
(7) Wooden slabs may be fixed to wooden structures or ceilings with wooden screws or nails. If they are fixed along a brick or concrete wall, the wooden wedge may be fixed to the wall and then the wooden groove shall be nailed to the wooden wedge The
Timber board requirements:
Base plate fixed distance: 30mm end; the middle of 600mm
Cover plate fixed distance: the end of 60mm; the middle 450mm
1.4.5 laying requirements of steel pipe wiring
(1) steel pipe and its accessories should be able to anti-corrosion, Ming Tu set when the brush anti-corrosion paint, dark laying with concrete protection.
(2) between the connection between the steel pipe and the junction box are required to be connected into a conductive overall welding ground wire, that is, with a diameter of 4mm galvanized iron wire welding or with two diameter 2mm galvanized iron wire in each pipe wrapped around 5 Circulation after soldering.
(3) the diameter of the steel pipe to be smooth, no clogging, no loopholes, the joints should be close.
(4) bending radius of the steel pipe bend shall not be less than 6 times the diameter of the pipe; buried in the dark set of 10 times; the angle of each bend can not be less than 90 °. When the pipeline through the building expansion joints, in order to prevent the base sinking uneven, damage to the pipe and wire, to be installed in the expansion joints compensation box.
(5) The total cross-sectional area of the wire (including the insulating layer of the conductor) shall not be greater than 40% of the cross-sectional area of the inner diameter of the pipe; the pipe wire is not allowed to be connected and twisted.
(6) When the steel pipe is embedded in the reinforced concrete slab, the diameter of the steel pipe shall not exceed 1/3 of the thickness of the concrete slab; the coking slag shall be buried in the steel pipe, and the cement mortar Protection, and then lay the coke slag layer; buried in the underground soil must use thick-walled steel pipe, pipe wall and welding ground at the need to brush asphalt corrosion.
(7) wire through the tube, the same circuit of the phase of the wire, regardless of the number of root, should penetrate a tube; different circuits and different voltage lines, not allowed to wear in a tube; AC and DC line Do not wear in the same tube, a phase wire is not allowed to penetrate the steel pipe alone.
(8) the steel pipe in the wall of the fixed, when the pipe diameter of 20mm below the pipe card and the distance between the card should not be greater than 1.5m; pipe diameter below 40mm, the tube card distance should not be greater than 2.5m; When the diameter exceeds 40mm, it can be increased to 3.5m.
(9) steel pipe into one, should be grounded or connected to zero.
(10) When the laying of steel pipe exceeds the following length, the junction box or junction box shall be installed in the middle:
1) When the length of the tube exceeds 30 m and there is no bending;
2) When the length of the tube exceeds 20 m and there is a bend;
3) When the length of the tube is more than 12 m and there are two bends;
4) When the length of the tube is more than 8 m and there are three bends.
1.4.6 plastic pipe wiring requirements
(1) plastic pipe wiring and pipe wiring is basically the same. The use of the annex should also be plastic products, but also because the plastic pipe mechanical strength is low, buried in the wall when the application of cement mortar protection, under the ground, the application of concrete protection.
(2) the connection of plastic pipe can be inserted with the method, insert the first method is a plastic pipe with the end of the furnace baking heating softening (be careful not to leave the fire too close to avoid burning pipe), and then put Another plastic tube can be inserted into about 30mm.
(3) plastic pipe bending, can be baked in the fire heating, soften slowly after bending, if the larger diameter can be filled in the first tube of heated sand, and then heated plastic pipe bending, bending radius of not less than 6 times the diameter of the pipe at the bend should not be bent, so as not to affect through the wire.
(4) When the plastic pipe along the wall laying, the fixed point between the diameter of 20mm or less, the tube spacing should not be greater than 1m; diameter of 40mm or less, not more than 1.5m, diameter 50mm and Above, can be increased to 2m.
1.4.7 aluminum foil card laying requirements
(1) The wire is horizontal and vertical, and is flat with the building.
(2) the supply voltage of 220V or 380V line, the horizontal laying time is generally not less than 2.5m; vertical laying not less than 1.8m, less than 1.8m of the line, should be added protective equipment (such as plastic pipe ).
(3) when the circuit through the wall, should be installed casing protection.
(4) 220V and 380V line connector, should be carried out in the aluminum junction box.
(5) the distance between the aluminum card is generally not more than 300mm. Switches, sockets, lamps or junction boxes, etc., should be nailed an aluminum card. At the same time, switches, sockets, lamps and junction boxes, etc., should be left out of the thread in order to connect.
2 lighting line operation and maintenance
Before the operation of the lighting line should be carried out, should be carefully checked and accepted, and the establishment of equipment technology management files, indicating the specification and load name, after the operation and maintenance fill in the relevant inspection items, such as load conditions, insulation, defects, Master the operation of the line. On the roof of the lighting line should be inspected once a year inspection and maintenance time; line power outage time more than a month before re-transmission, should be patrol inspection, and insulation resistance. Lighting line inspection inspection of the contents are:
2.1 Check whether the wires and buildings are rubbing and rubbing, whether the insulation is damaged, whether the insulation support is off or not.
2.2 workshop bare wire phase and the distance between the line is the same distance, bare wire protection network (board) and bare wire distance is required, if necessary, adjust the distance between the wire and the wire and the ground.
2.3 Where is the laying of the wire and the trough, etc. whether there is cracking, injury, the steel pipe is good. Check the insulator, porcelain beads, wire crossbar, metal plate support state, if necessary, to be repaired.
2.4 Steel pipe and plastic pipe waterproof elbow with or without the phenomenon of wire rubbing the nozzle.
Plastic pipes laid under the ground above 2.5 without heavy backlog or collision.
2.6 whether the conductor has a long-term overload phenomenon, the wire connection point is good, there is no overheating.
2.7 should always check the zero line circuit of the connection point of contact is good, there is no corrosion or disengagement.
2.8 if the line is connected with the unqualified or other electrical equipment not allowed, there is a temporary line.
2.9 measure insulation resistance, in the wet workshop, corrosive gas, steam house, measure every year more than two times, the insulation value shall not be less than 500 ohms per volt working voltage; drying workshop, measure every year once per volt voltage insulation resistance value shall not be less than 1000.
2.10 check all kinds of signs and warning signs are complete, check whether the fuse is appropriate and complete.
