Search result: GB 50256-2014 (GB 50256-1996 Older version)
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Code for construction and acceptance of electric device of crane electrical equipment installation engineering
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GB 50256-2014
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| GB 50256-1996 | English | RFQ |
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Code for construction and acceptance of electric device of crane electrical equipment installation engineering
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GB 50256-1996
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| Standard ID | GB 50256-2014 (GB50256-2014) | | Description (Translated English) | Code for construction and acceptance of electric device of crane electrical equipment installation engineering | | Sector / Industry | National Standard | | Classification of Chinese Standard | P91 | | Word Count Estimation | 41,414 | | Date of Issue | 12/2/2014 | | Date of Implementation | 8/1/2015 | | Older Standard (superseded by this standard) | GB 50256-1996 | | Quoted Standard | GB 50150; GB 50171; GB/T 50300; GB 4205 | | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Ministry of Housing and Urban-Rural Development of the People's Republic of China | | Summary | This Standard applies to construction projects rated voltage 10kV and below all kinds of cranes, construction and inspection of electrical installations and electric hoist trolley line installation project. |
GB 50256-2014 English name.Code for construction and acceptance of electric device of crane electrical equipment installation engineering
1 General
1.0.1 In order to ensure the construction and installation quality of crane electrical installations, promote the progress of construction and installation technology, and ensure the safe operation of equipment, this specification is formulated.
1.0.2 This specification is applicable to the construction and acceptance of electrical installations and trolley wire installations of various cranes and electric hoists with a rated voltage of 10kV and below in construction projects.
1.0.3 The construction and acceptance of crane electrical installations shall not only comply with this specification, but also comply with the current relevant national standards.
2 terms
2.0.1 trolley line and slip connector
A feeder used to supply power to mobile equipment consists of two parts. trolley line-sliding line guide rail and slider-collector.
2.0.2 signal cable signal cable
Cables for devices with a rated voltage of AC 500V or DC 1000V and below for transmitting digital signals, analog signals, audio signals or automatic signals.
2.0.3 raceway
A grooved channel specially designed for laying and fixing wires or cables.
2.0.4 resistor resistor
An electrical appliance made of resistive material, with a certain structural form, capable of limiting the passage of current in a circuit or converting electrical energy into heat, etc., consists of three parts. a resistor body, a skeleton and a lead-out terminal.
2.0.5 brake device brake
A device that has the functions of decelerating, stopping or keeping a moving part (or moving machinery) in a stopped state.
2.0.6 travel limit switch limit switch
The control electrical appliances that use the collision of the moving parts of the production machinery to make the contacts move to connect or break the control circuit to achieve a certain control purpose.
2.0.7 rail clamp
A safety device that locks the rail-mounted crane on the track for wind, slide, and overturning.
2.0.8 Controller controller
In the electrical transmission device, a device that opens and closes the contacts according to a certain logical relationship to achieve the purpose of issuing commands or interlocking and switching with other control circuits, also known as the master switch.
2.0.9 variable-frequency drive
A power converter in a motion control system is a control device that uses the on-off function of a power semiconductor device to convert a commercial frequency power supply into another frequency electric energy.
2.0.10 Programmable logic controller (PLC) programmable logic controller
An electronic device specially designed for digital operations in industrial environments. It uses a memory that can be programmed to store instructions for performing operations such as logic operations, sequential operations, timing, counting, and arithmetic operations, and can control various types of devices through digital or analog inputs and outputs. machinery or production process.
2.0.11 touch screen touch panel
An inductive liquid crystal display device capable of receiving input signals such as touch and having a human-computer interaction function. When the graphic buttons on the display are touched, the tactile feedback system on the display can drive various linking devices according to the pre-programmed program, which can replace the mechanical button panel.
3 Basic Regulations
3.0.1 The installation of crane electrical installations should be carried out according to the approved design and product technical documents.
3.0.2 The transportation and storage of the electrical equipment of the crane shall meet the requirements of the product technical documents.
3.0.3 The equipment and equipment used should have qualified certificates. The equipment should have a nameplate mark. After the equipment and equipment arrive at the site, the following acceptance checks should be done.
1 The packaging should be complete, and the seal should be well sealed;
2 Open the box for inspection and inventory. The model and specification should meet the design requirements, and the accessories and spare parts should be complete;
3 The technical documents of the product should be complete;
4 Visual inspection should be free of damage, deformation and rust.
3.0.4 Safety technical measures should be formulated for installation and construction.
3.0.5 The construction of construction projects related to the installation of crane electrical installations shall comply with the following regulations.
1 The construction engineering quality of buildings (structures) related to the installation of crane electrical installations shall comply with the relevant provisions of the current national standard "Unified Standards for Construction Quality Acceptance of Construction Engineering" GB/T 50300.When there are special requirements for equipment and design, special requirements should still be met.
2 Before the equipment is installed, the construction project shall meet the following conditions.
1) The roof waterproofing of the upper part of the crane should be qualified for acceptance;
2) The mounting holes for trolley line brackets reserved on the concrete beams and the embedded parts and reserved holes for the tensioning device of the suspension type flexible cable terminal shall be located correctly, the holes shall not be blocked, and the embedded parts shall be firm;
3) Before the sliding contact line is installed, the interior decoration work of related buildings (structures) should be completed.
3.0.6 The non-live metal parts such as the framework of the crane electrical installation, steel pipes, trolley wire brackets, etc., should be coated with anti-corrosion paint or galvanized.
3.0.7 The fasteners used for equipment installation, except the anchor bolts, should be galvanized.
3.0.8 Insulation Cranes should be provided with three insulations for the hook and the pulley, the hoisting mechanism and the trolley frame, and the trolley frame and the cart. The resistance value of each insulation measured with a 1000V megohmmeter at normal temperature should be greater than or equal to 1MΩ. In the non-working state, the induced voltage on the trolley frame should not exceed the safe voltage value (36V).
3.0.9 The grounding of the non-live metal parts of the crane shall comply with the following regulations.
1 When the grounding sliding connector is installed, the sliding connector should be in reliable contact with the track or the grounding sliding contact line.
2 When the driver's cab and the crane body are connected by bolts, electrical crossover must be carried out; the crossover points should not be less than two.
3.Multi-strand annealed copper wire should be used for cross-connection, and its cross-sectional area should not be less than 16mm2.The crimped terminals at both ends should be fixed with galvanized bolts. When round steel or flat steel is used for cross-connection, the diameter of the round steel should not be less than 12mm. The width and thickness of the flat steel section shall not be less than 40mm×4mm.
4 Installation of trolley line, sliding connector and suspension flexible cable
4.0.1 The arrangement of trolley contact lines should meet the design requirements; if there is no design requirement, it should meet the following regulations.
1 The height of the trolley line from the ground shall not be lower than 3.5m; in the part where cars pass, the height of the trolley line from the ground shall not be lower than 6m.
2 The distance between the trolley line and equipment and oxygen pipelines shall not be less than 1.5m; the distance from the flammable gas and liquid pipelines shall not be less than 3m; the distance from general pipelines shall not be less than 1m.
3 The exposed trolley line must be provided with blocking protection near the parts accessible to pedestrians such as ladders and aisles.
4.0.2 The installation of the trolley line bracket and its insulators shall comply with the following regulations.
1.The support shall not be installed at the junction of expansion joints of buildings (structures) and track beams.
2 The bracket should be installed firmly and should be on the same horizontal or vertical plane.
3 Insulators and insulating sleeves must not have defects such as cracks and mechanical damage; the surface should be clean; the insulation performance should meet the relevant provisions of the current national standard "Electrical Equipment Handover Test Standard for Electrical Installation Engineering" GB 50150; the iron-ceramic joint should be firmly bonded.
4 The trolley line insulators and insulating bushings installed outdoors or in humid places shall be of the outdoor type.
5 The fixing bolts at both ends of the insulator should be poured with high-grade cement mortar, and should be able to bear the pulling force of the trolley line.
6 The trolley wire support should be reliably grounded.
4.0.3 The installation of trolley line should meet the following regulations.
1 The contact surface should be straight and free of corrosion, and the electrical conductivity should be good.
2 The installation of bare trolley line should be carried out according to the design requirements. When there is no requirement in the design, for a trolley line with a rated voltage below 0.5kV, its adjacent conductive parts and the clear distance between the conductive part and the grounding part shall not be less than 30mm; The clear distance shall not be less than 100mm; when the requirement cannot be met, insulation isolation measures shall be taken for the trolley line.
3 When the crane is at the terminal position, the distance between the sliding connector and the end of the trolley line should not be less than.200mm; for the fixedly installed steel trolley line, the distance between the terminal bracket and the end of the trolley line should not be greater than 800mm.
4 The material used for the steel trolley line should be straightened, and its center deviation should not be greater than 1/1000 of the length, and should not be greater than 10mm.
5 The trolley line should be straight after installation; the distance between the trolley lines should be consistent, and its center line should be kept parallel to the actual center line of the crane track; the parallelism between the center line of the trolley line and the center line of the crane track, The parallelism between the trolley lines of each phase shall not be greater than 1/1000 of the length, and shall not be greater than 10mm.
6 When the length of section steel trolley line exceeds 50m or crosses the expansion joints of buildings (structures), expansion compensation devices shall be installed.
7 The auxiliary conductor should be laid along the trolley line, and should be reliably connected with the trolley line; the distance between the connection points should not be greater than 12m.
8 The steel trolley line should be able to expand and contract on the bracket, and should be fixed on the intermediate bracket.
Except for the contact surface of 9-type steel trolley line, the surface shall be painted with red paint.
4.0.4 The installation of trolley line expansion compensation device shall comply with the following regulations.
1 The expansion compensation device should be installed on the bracket closest to the expansion joint of the building (structure).
2 At the telescopic compensation device, there should be a gap of 10mm to 20mm for the sliding contact line, the ends of the sliding contact line on both sides of the gap should be processed smoothly, the contact surface should be installed on the same level, and the height difference between the two ends should not be greater than 1mm.
3 There should be trolley line supports on both sides of the gap of the telescopic compensation device, and the distance between the bracket and the gap should not be greater than 150mm.
4 The trolley lines on both sides of the gap should be connected by flexible wires, and there should be a margin for the crossover line, and its allowable current carrying capacity should not be less than that of the trolley line.
4.0.5 The connection of trolley lines shall comply with the following regulations.
1 There should be sufficient mechanical strength after connection, and there should be no obvious deformation.
2 The contact surface at the joint should be straight and smooth, and the height difference should not be greater than 0.5mm. After the connection, the raised part should be trimmed and straightened.
3.When the type steel trolley line is welded, a connecting support plate shall be attached; when it is connected by bolts, a jumper cord shall be added.
4 When welding the rail trolley line, the welding rod and weld seam should meet the material and quality requirements of the rail welding process, and the contact surface should be straight and smooth after welding.
5 When the wire is connected to the trolley line, the joint of the trolley line should be tinned or welded with a terminal plate with electroplating.
4.0.6 The installation of trolley lines for segmental power supply shall comply with the following regulations.
1 For the trolley line with segmental power supply, when the parallel operation of each segmental power supply is allowed, the segmental gap should be 20mm, and the trolley line with 3kV and above should meet the design requirements.
2 At the gap between trolley lines where parallel operation is not allowed for segmental power supply, the segmental gap should be 40mm greater than the contact length between the sliding connector and the trolley line. The gap should be connected with a support plate of hard insulating material, and the contact surface of the support plate and the trolley line should be at the same level.
3 The phases of the power supply on both sides of the segmental gap of the trolley line should be consistent.
4.0.7 The installation of trolley lines of 3kV and above shall meet the following provisions in addition to the provisions of Articles 4.0.1 to 4.0.6 of this code.
1 High-voltage insulators should be subjected to withstand voltage tests before installation, and should comply with the relevant provisions of the current national standard "Electrical Equipment Handover Test Standards for Electrical Installation Engineering" GB 50150.
2 The components of the trolley line fixing device, such as cast copper long splints, short splints, support plates, backing plates, auxiliary connection plates and wiring boards, etc., shall be completed according to the design drawings before installation; When assembled in sections, they should be numbered according to the phase, and the joints should be tight and straight.
4.0.8 The installation of flexible cable slings and free-suspending trolley lines shall comply with the following regulations.
1 The mechanical strength of the terminal fixing device and tensioning device shall meet the design requirements, and its maximum pulling force shall be greater than that of the trolley line or sling.
2 When the length of the trolley line and the sling is less than or equal to 25m, the adjustment margin of the terminal tensioning device shall not be less than 0.1m; when the length of the trolley line and the sling is greater than 25m, the adjustment margin of the terminal tensioning device shall not Should be less than 0.2m.
3 The slack of the trolley line or sling when it is tensioned should be selected according to its material specification and the ambient temperature during installation, and the sag deviation between the trolley lines should not be greater than 20mm.
4 The insulation between the trolley line and the terminal device should be reliable.
4.0.9 The installation of suspension flexible cables shall comply with the following regulations.
1 When the section steel is used as the flexible cable slideway, the section steel should be installed straight, the slideway should be straight and smooth, and the mechanical strength should meet the service conditions.
2 The cable clamps of the suspension device should be reliably fixed with the flexible cables, and the distance between the cable clamps should not be greater than 5m.
3 After the flexible cable is installed, its suspension device should move flexibly along the slideway without jumping or jamming. The reversing of the flexible cable should be flexible without jamming; there should be no friction and no interference between the flexible cable and the fixing device; the distance between the lowest point of the flexible cable and the highest point on the ground should be greater than 100mm.
4 The length of the moving section of the flexible cable should be 15% to 20% longer than the moving distance of the crane, and a traction rope should be installed. The length of the traction rope should be shorter than the length of the moving section of the flexible cable and longer than the moving distance of the crane.
5 The two ends of the moving part of the flexible cable shall be firmly fixed to the crane, steel cable or section steel slideway respectively.
6 The test of the suspension flexible cable shall comply with the relevant provisions of the current national standard "Electrical Equipment Handover Test Standard for Electrical Installation Engineering" GB 50150.
4.0.10 The installation of reel type flexible cable shall comply with the following regulations.
1 When the crane is moving, the flexible cable should not be squeezed.
2 After installation, the flexible cable and the reel should maintain proper tension, but the reel should not rotate freely.
3.The speed of unwinding and rewinding of the reel should be consistent with the moving speed of the crane; when adjusting the reel with the weight, the length of the cable should match the stroke of the weight.
4 When the crane puts the cable to the terminal, more than two turns of the cable should be kept on the drum.
5 The maximum cable capacity of the reel should not exceed the stipulations in the technical documentation of the product.
6 The cable core should not be under tension during the full stroke.
7 The slip ring and brush holder should be firmly fixed; the contact pressure of the brush should be appropriate and in good contact; the brush and the brush holder should be able to move up and down freely; the gap between the brush holder and the slip ring should be 2mm to 4mm.
4.0.11 The installation of safety trolley line should meet the following regulations.
1 The installation of the safety trolley line should be carried out according to the design regulations or according to the requirements of different structural forms. When the length of the trolley line is greater than.200m, a telescopic device should be installed.
2 The connection of the safety sliding contact line should be straight, the bracket clips should be installed firmly, and the distance between the bracket clips should be less than 3m.
3 The installation of the safety trolley line support should be welded on the backing plate under the track if there is no design requirement; when it is fixed in other places, it should be connected to the ground, and the ground resistance should be less than 4Ω.
4 The insulation sheath of the safety trolley line should be intact without cracks or damage.
5 The tension spring of the sliding connector should be intact and flexible, the wear-resistant graphite sheet should be in reliable contact with the trolley line, and arc jumping should not occur when sliding, and the connecting flexible cable should meet the requirements of current carrying capacity.
6 For the installation of the safety trolley line, the height difference between the two sides of the joint contact surface should be consistent; the center line of the trolley line should be parallel to the center line of the track of the mobile equipment, and the trolley lines of each phase.
7 The remaining length of the sliding contact line should be greater than.200mm.
4.0.12 The installation of sliding joints shall comply with the following regulations.
1 The fixing of the sliding connector bracket should be firm, the insulator and the insulating liner should not have cracks, damage and other defects, the insulation of the conductive part to the ground should be good, and the distance between phases and ground should comply with the relevant provisions of Article 4.0.3 of this code.
2 The sliding connector should be in reliable contact along the entire length of the sliding contact line, and should be able to slide freely and unimpeded, and the center line (wide surface) of the sliding contact should not exceed the edge of the sliding contact line at any position.
3 There should be no sharp edges on the contact part of the sliding connector and the sliding contact line; the pressure of the compression spring should meet the requirements of the product technical documents.
4 Between the groove type sliding connector and the adjustable sliding rod, it should move flexibly.
5 The wheel-type sliding connector of freely suspended trolley line shall be higher than the middle bracket of trolley line after installation, and shall not be less than 10mm.
5 Wiring
5.0.1 The wiring on the crane should meet the following requirements.
1 Except for the weak current system, the wiring on the crane should adopt copper core flexible cables with a rated voltage of not less than 500V. In addition to meeting the calculated load, the cross-sectional area of the flexible cable shall not be less than 1.0mm2.
2 In the parts that are vulnerable to mechanical damage, heat radiation or dripping lubricating oil, the wires or cables should be installed in steel pipes, trunking, and protective covers; in the heat radiation parts, the wires or cables should be protected by heat insulation measures.
3 Where the wire or cable passes through the hole of the steel structure, the burrs of the hole should be removed and protective measures should be taken.
4 The laying of cables on the crane shall comply with the following regulations.
1) Arrange neatly according to the order in which the cables are led out, and should not cross; cables for strong current and weak current should be laid separately, and there should be signs at both ends of the cables;
2) Weak current circuits such as tachometers, encoders or solving devices should be connected with shielded cables, and the shielding layer should not be interrupted, and the shielding layer should be reliably grounded;
3) The cable should be fixed, and the distance between the supporting points should not be greater than 1m; the single-core power cable should be fixed with non-magnetic materials.
5 The wiring on the crane should be arranged neatly, and the two ends of the wires should be firmly crimped to the corresponding terminals, and should be marked with obvious wiring numbers, and open terminals should not be used. Only two wires of the same specification and type should be connected to the same terminal at most.
6 The wiring numbers of the wiring on the crane shall meet the following requirements.
1) The wiring number tube should match the wire diameter of the wire;
2) The wiring number tubes should be clearly printed, easy to identify, neatly arranged, and adopt the relative numbering method.
5.0.2 The laying of wire pipes and trunking on the crane shall comply with the following regulations.
1 Steel pipes and trunking should be fixed firmly;
2.For the laying of steel pipes for surface cranes, the mouth of the pipes should be downwards or other waterproof measures should be taken;
3.All nozzles of the crane should be equipped with mouth guards;
4 The installation of the trunking shall meet the requirements for laying wires or cables, and protective measures shall be taken at the entrances and exits of wires or cables.
6 Electrical equipment and protective devices
6.0.1 Before installing the electrical equipment and protective devices of the crane, check the equipment size, equipment installation location, direction and pipeline location, which shall meet the requirements of the design and product technical documents.
6.0.2 The installation of distribution panels and cabinets shall comply with the following regulations.
1 Comply with the relevant provisions of the current national standard GB 50171 "Specifications for the Construction and Acceptance of Electrical Installation Work Panels, Cabinets and Secondary Circuit Wiring";
2 It should not be fixed by welding, and the fastening bolts should have anti-loosening measures;
3 The rainproof device of the power distribution panel and cabinet of the outdoor crane shall be installed correctly and firmly;
4 The cabinet components should be installed reliably.
6.0.3 The installation of resistors should comply with the following regulations.
1.The resistors are installed in the resistance cabinet, which should have the function of heat dissipation; the resistors should not be stacked more than four boxes directly, and when more than four boxes should be fixed with brackets, and an appropriate distance should be kept. When more than six boxes should be installed separately Make a group.
2 The cover plate or protective cover of the resistor should be installed correctly and fixed reliably.
3 Asbestos sleeves or ethylene-coated glass fiber tubes should be added to the connecting wires close to the heating parts such as resistors.
6.0.4 The installation of the braking device shall comply with the following regulations.
1 The action of the braking device must be rapid, accurate and reliable.
2 When a mechanism of the crane is driven by two sets of motors that are mechanically disconnected from each other, the action time of the brakes should be consistent.
6.0.5 The installation of travel limit switch, ram and rail clamp should meet the following requirements.
1.After the travel limit switch of the crane is activated, the relevant power supply shall be cut off automatically, and the various mechanisms of the crane shall be stopped at the following positions.
1) Lift the hook and grab bucket to a distance of not less than 100mm from the limit position; the limit angle of lifting the boom meets the product regulations;
2) Crane bridges and trolleys, etc., shall not be less than.200mm away from the end of the stroke;
3) One crane is close to another crane, the distance shall not be less than 400mm;
4) Luffing type cranes should be installed with maximum and minimum limits to prevent the jib from tilting forward and backward, and the amplitude reaches the maximum or minimum limit.
2 The installation of the ram and the determination of its size shall ensure that the stroke limit switch operates reliably, and the ram and the ram support shall not shake when the crane is working. The width of the ram should be able to meet the requirements for the lateral movement range of the machinery (bridge and trolley), and the length of the ram should be able to meet the requirements for the maximum braking distance of the machinery (bridge and trolley).
3 After the lance is adjusted and positioned, it should be fixed reliably.
6.0.6 The installation of the controller shall comply with the following regulations.
1 The installation position of the controller should be convenient for operation and maintenance.
2 The installation height of the operating handle or handwheel should be convenient for operation and monitoring, and the operating direction should be consistent with the running direction of the mechanism, and should comply with the current national standard "Basic and Safety Rules for Human-Machine Interface Marking and Operation Rules" GB 4205.
6.0.7 The installation of lighting devices shall comply with the following regulations.
1 The lighting power supply should be an independent power supply. After the main circuit breaker of the crane cuts off the power supply, the lighting should not be powered off.
2.The accessories of lamps and lanterns should be complete, and should be hung firmly, and the lamps and lanterns should not swing violently during operation.
3 The lighting circuit should be equipped with a special neutral line or an isolation transformer, and the grounding line of the wire tube or the crane itself must not be used as the neutral line.
4 The installation of safety transformer or isolation transformer should be firm and the insulation should be good.
5.The cables of the lighting system should be laid through pipes, and there should be no joints in the middle.
6.0.8 Cranes should be equipped with power-off protection devices. When a mechanism of the crane is driven by two sets of motors that are mechanically disconnected from each other, the two motors should have protection devices for synchronous operation and simultaneous power failure.
6.0.9 The commissioning of the lifting load limiter shall comply with the following regulations.
1 The comprehensive error of the lifting load limiter is strictly prohibited to be greater than 8%.
2 When the load reaches 90% of the rated lifting capacity, a warning signal must be issued.
3 When the load reaches 110% of the rated lifting capacity, the power supply of the motor of the hoisting mechanism must be automatically cut off, and a prohibitive alarm signal should be issued.
6.0.10 The metal structure of the crane and the shells, pipe grooves and metal sheaths of cables of all electrical equipment shall be reliably grounded.
7 Project Quality Acceptance
7.0.1 Before the trial operation of the crane, the electrical installation should meet the following conditions.
1 The installation of electrical installations should be completed and accepted.
2 The wiring of the electrical circuit sho......
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