GB 50256-1996 Electrical installation engineering crane electrical installation construction and acceptance specification
Some standard content:
Engineering Construction Standard Full Text Information System
National Standard of the People's Republic of China
50256—96
Electrical Device Installation Engineering
Code for Construction and Acceptance of Electric Device of Crane Electrical Equipment Installation
Published on 1996—06—05
State Bureau of Technical Supervision
Ministry of Construction of the People's Republic of China
Engineering Construction Standard Full Text Information System
Implemented on 1996-12-01
Jointly Issued
Engineering Construction Standard Full Text Information System
National Standard of the People's Republic of China
Electrical Device Installation Engineering
Code for Construction and Acceptance of Electric Device ofcrane Electrical Equipment Installation engineeringGB50256—96
Editing department: Ministry of Electric Power Industry of the People's Republic of ChinaApproving department: Ministry of Construction of the People's Republic of ChinaEffective date: December 1, 1996
Engineering construction standard full-text information system
Engineering construction standard full-text information system
Notice on the release of four national standards including "Specifications for Construction and Acceptance of Low-voltage Electrical Equipment for Electrical Installation Engineering"Jianbiao [1996] No. 337
According to the requirements of the State Planning Commission's document [19862630] and the Ministry of Construction's document (91) Jianbiaoji No. 6, the four standards including "Specifications for Construction and Acceptance of Low-voltage Electrical Equipment for Electrical Installation Engineering" jointly revised by the Ministry of Electric Power Industry and relevant departments have been reviewed by relevant departments. The "Construction and Acceptance Specification for Low Voltage Electrical Equipment in Electrical Installation Engineering" GB50254-96, "Construction and Acceptance Specification for Power Converter Equipment in Electrical Installation Engineering" GB50255-96, "Construction and Acceptance Specification for Crane Electrical Equipment in Electrical Installation Engineering" GB50256-96 and "Construction and Acceptance Specification for Electrical Equipment in Explosion and Fire Hazardous Environments in Electrical Installation Engineering" GB50257-96 are now approved as mandatory national standards, which will be implemented from December 1, 1996. The seventh chapter "Low Voltage Electrical Equipment", the sixth chapter "Silicon Rectifier Devices", the eighth chapter "Crane Electrical Equipment" and the sixteenth chapter "Electrical Equipment in Explosion and Fire Hazardous Areas" of the original "Construction and Acceptance Specification for Electrical Installation Engineering" GBJ232-82 are abolished at the same time. The Ministry of Electric Power Industry is responsible for the management of this specification, the Ministry of Electric Power Industry's Electric Power Construction Research Institute is responsible for the specific interpretation, and the Ministry of Construction's Standards and Quotas Research Institute is responsible for the publication and distribution. Ministry of Construction of the People's Republic of China
June 5, 1996
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Slip-on and slip-on connectors
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4 Electrical equipment and protective devices
5 Project handover and acceptance
Additional instructions
Explanation of standardized terms
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
1 General
1.0.1 This specification is formulated to ensure the construction and installation quality of crane electrical equipment, promote the advancement of construction and installation technology, and ensure the safe operation of equipment. 1.0.2 This specification applies to the construction and acceptance of electrical equipment of various types of newly installed cranes and electric hoists with a rated voltage of less than 0.5kV and slip-on installation projects of 3KkV and below.
3 The installation of crane electrical equipment shall be carried out in accordance with the approved design and product technical documents.
1.0.4 The transportation and storage of crane electrical equipment shall comply with the relevant provisions of the current national standards. When there are special requirements for the product, it shall also meet the requirements of the product. 5 The equipment and instruments used shall comply with the provisions of the current national technical standards and shall have a certificate of conformity. The equipment shall have a nameplate. 1.0.6 After the equipment and instruments arrive at the site, the following acceptance inspections shall be carried out: 1.0.6.1 The packaging is complete and the seals should be well sealed. 1.0.6.2
Unpacking inspection and inventory, the specifications should meet the design requirements, and the accessories and spare parts should be complete.
The technical documents of the product should be complete.
1.0.6.4 The appearance inspection should be free of damage, deformation and rust. 7 The safety and technical measures during construction shall comply with this specification and the provisions of the current relevant safety and technical standards and product technical documents.
8 The construction of buildings and structures related to the installation of crane electrical equipment shall meet the following requirements1.0.8
The quality of construction projects related to the installation of crane electrical equipment shall meet the relevant provisions of the current national construction and acceptance specifications. When there are special requirements for equipment and design, they shall also meet their requirements. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Before the equipment is installed, the construction project shall meet the following conditions: (1) The ceiling above the crane shall not be leaking; (2) The reserved installation holes of the sliding wire bracket on the concrete beam and the embedded parts and reserved holes of the suspension soft cable terminal tensioning device shall be correctly positioned, the holes shall not be blocked, and the embedded parts shall be firm; (3) The concrete beams where the sliding wire is installed shall be painted. 9 The non-live metal parts of the crane electrical equipment, such as the frame, steel pipe, sliding wire bracket, etc.1.0.9
, shall be painted with anti-corrosion paint or galvanized.
1.0.10 Except for the anchor bolts, the fasteners used for equipment installation shall be galvanized products. 1.0.11 The grounding of the non-live metal parts of the crane shall meet the following requirements: 1.0.11.1 When a grounding slide is installed, the slide and the track or grounding slide wire shall be in reliable contact.
1.0.11.2 When the driver's cab and the crane body are connected by bolts, an electrical jumper shall be made, and the jumper points shall not be less than two. The jumper should use multi-strand soft copper wire, and its cross-sectional area shall not be less than 16mm2. The crimping terminals at both ends shall be fixed with galvanized bolts. When round steel or flat steel is used for jumpering, the diameter of the round steel shall not be less than 12mm, and the width and thickness of the flat steel cross-sectional area shall not be less than 40mm×4mm.
1.0.11.3 Each track of the crane shall be grounded at two points. At the joints between the rail ends, electrical cross-connection should be made; the grounding resistance should be less than 42. 1.0.12 The construction and acceptance of crane electrical installations shall comply with the provisions of the relevant national standards and specifications in addition to the provisions of this specification. Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Slip-on Wires and Slip-on Connectors
2.0.1 The layout of the slip-on wires shall comply with the design requirements. When there are no regulations in the design, the following requirements shall be met:
The height of the slip-on wire from the ground shall not be less than 3.5m; the height of the slip-on wire from the ground in the part where cars pass shall not be less than 6m. 2.0.1.2 The distance between the slip-on wire and the equipment and oxygen pipeline shall not be less than 1.5m; the distance from the flammable gas and liquid pipeline shall not be less than 3m; the distance from the general pipeline shall not be less than 1m.
The exposed slip-on wire shall be installed on the same side as the driver's cab; when the staff is in danger of touching the slip-on wire, it must be protected from the ground. 2.0.2 The installation of the support and insulator of the sliding connection shall meet the following requirements: 2.0.2.1 The support shall not be installed at the junction of the building expansion joint and the track beam. The support shall be installed flat and firmly, and shall be on the same horizontal or vertical plane. 2.0.2.2
Insulators and insulating sleeves shall not have mechanical damage and defects; the surface shall be clean; the insulation performance shall be good; red steel paper gaskets shall be added between the insulator and the support and the steel fixings of the sliding connection.
2.0.2.4 The sliding connection insulators and insulating sleeves installed outdoors or in humid places shall be outdoor-type.
2.0.2.5 The fixing bolts at both ends of the insulator should be poured with high-grade cement mortar and should be able to withstand the tensile force of the sliding connection.
2.0.3 The installation of the sliding connection shall meet the following requirements: 2.0.3.1 The contact surface shall be flat and free of rust, and the conductivity shall be good. 2.0.3.2 For sliding connections with a rated voltage of less than 0.5 kV, the clearance between adjacent conductive parts and between conductive parts and grounded parts shall not be less than 30 mm; the clearance between phases and between phases and ground of indoor 3 kV sliding connections shall not be less than 100 mm. When the above requirements cannot be met, insulation isolation measures shall be taken for sliding connections.
2.0.3.3 When the crane is in the terminal position, the distance between the sliding connector and the end of the sliding wire should not be less than 200mm; for the fixed steel sliding wire, the distance between the terminal bracket and the end of the sliding wire should not be greater than 800mm.
2.0.3.4 The material used for the steel sliding wire should be straightened, and its center deviation should not be greater than 1/1000 of the length, and should not be greater than 10mm. 2.0.3.5 The sliding wire should be straight after installation; the distance between the sliding wires should be consistent, and its center line should be parallel to the actual center line of the crane track, and its deviation should be less than 10mm; the horizontal deviation or vertical deviation between the sliding wires should be less than 10mm. 2.0.3.6 When the length of the steel sliding wire exceeds 50m or crosses the expansion joint of the building, an expansion compensation device should be installed.
2.0.3.7 The auxiliary wire should be laid along the sliding wire and should be reliably connected to the sliding wire; the spacing between its connection points should not be greater than 12m. 2.0.3.8 The steel sliding wire should be able to expand and contract on the bracket and should be fixed on the middle bracket.
Color paint.
Except for the contact surface, the surface of the steel sliding wire should be painted with red paint or the corresponding 2.0.4 The installation of the sliding wire expansion and contraction compensation device should meet the following requirements: 2.0.4.1 The expansion and contraction compensation device should be installed on the bracket closest to the expansion joint of the building.
2.0.4.2 At the expansion and contraction compensation device, a gap of 10 to 20 mm should be left for the sliding wire. The ends of the sliding wires on both sides of the gap should be processed smoothly. The contact surface should be installed on the same horizontal plane, and the height difference between the two ends should not be greater than 1 mm.
2.0.4.3 There should be sliding wire support points on both sides of the gap of the expansion and contraction compensation device. The distance between the support point and the gap should not be greater than 150 mm. 2.0.4.4 The sliding wires on both sides of the gap should be crossed by soft wires. The crossing wire should have a margin, and its allowable current carrying capacity should not be less than the allowable current carrying capacity of the power supply wire. 2.0.5 The connection of the sliding wire shall meet the following requirements: Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
2.0.5.1 After connection, it shall have sufficient mechanical strength and no obvious deformation. 2.0.5.2 The contact surface at the joint shall be flat and smooth, and the height difference shall not be greater than 0.5mm. The raised part shall be trimmed and leveled after connection. 2.0.5.3 When welding the steel sliding wire, a connecting support plate shall be attached. When connecting with bolts, a jumper soft wire shall be added.
2.0.5.4 When welding the rail sliding wire, the welding rod and weld shall meet the requirements of the rail welding process for materials and quality. After welding, the contact surface shall be flat and smooth. 2.0.5.5
The number of joints in the round steel sliding wire shall be reduced.
When the conductor is connected to the sliding wire, the sliding wire joint shall be tinned or a terminal plate with an electroplated layer shall be welded.
2.0.6 The installation of the sectional power supply sliding connection shall meet the following requirements: 2.0.6.1 For the sectional power supply sliding connection, when each sectional power supply is allowed to run in parallel, the segment gap shall be 20mm. When parallel operation is not allowed, the segment gap shall be 40mm larger than the contact length between the sliding connector and the sliding connection; 3kV sliding connection shall meet the design requirements. 2.0.6.2 For the sliding connection gap where the sectional power supply is not allowed to run in parallel, a support plate made of hard insulating material shall be used for connection. The contact surface between the support plate and the sliding connection shall be on the same horizontal plane.
The phases on both sides of the sectional gap of the sliding connection shall be consistent. 2.0.7 In addition to complying with the provisions of Article 2.0.12.0.6 of this Code, the installation of 3kV sliding connection shall also meet the following requirements:
2.0.7.1 Before installation, the high-voltage insulator shall be subjected to a withstand voltage test and shall comply with the relevant provisions of the current national standard "Standard for Handover Test of Electrical Equipment for Electrical Installation Engineering". 2.0.7.3kV sliding connection fixture components, cast copper long splints, short splints, support plates, pads, auxiliary connection plates and terminal boards, etc., should be made according to the design drawings before installation. When the steel sections and double-groove copper wires are assembled in sections, they should be numbered according to the phases, and the joints should be tight and straight. 2.0.8
The installation of the slings and free-hanging sliding connections of flexible cables shall meet the following requirements:
2.0.8.1 The mechanical strength of the terminal fixtures and tensioning devices shall meet the requirements, and their maximum tension shall be greater than the maximum tension of the sliding connection or sling. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
When the length of the sliding connection and 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 sliding connection and sling is greater than 25m, the adjustment margin of the terminal tensioning device shall not be less than 0.2m. 2.0.8.3 The sag of the sliding wire or sling when tightened should be selected according to its material specifications and the ambient temperature during installation. The sag deviation between the sliding wires should not be greater than 20mm. 2.0.8.4 The insulation between the sliding wire and the terminal device should be reliable. 2.0.9 The installation of suspended flexible cables should meet the following requirements: 2.0.9.1 When steel is used as a slideway for flexible cables, the steel should be installed straight, the slideway should be flat and smooth, and the mechanical strength should meet the requirements. 2.0.9.2 The cable clamps of the suspension device should be reliably fixed to the flexible cable, and the distance between the cable clamps should not be greater than 5m.
2.0.9.3 After the flexible cable is installed, its suspension device should move flexibly along the slideway without jumping and should not be stuck.
2.0.9.4 The length of the flexible cable moving section 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 flexible cable moving section.
The two ends of the moving part of the flexible cable should be firmly fixed to the crane, steel cable or steel slideway respectively.
2.0.10 The installation of reel-type flexible cable shall meet the following requirements: 2.0.10.1 The flexible cable shall not be squeezed when the crane moves. 2.0.10.2
After installation, the flexible cable and the reel shall maintain appropriate tension, but the reel shall not rotate freely. bzxz.net
2.0.10.3 The cable release and cable reeling speed of the reel shall be consistent with the moving speed of the crane; when the reel is adjusted with a weight bowl, the cable length and the weight stroke shall be adapted. 2.0.10.4 When the crane releases the cable to the terminal, more than two turns of cable shall be retained on the reel.
2.0.11 The installation of the safety sliding wire shall meet the following requirements: 2.0.11.1 The installation of the safety sliding wire shall be carried out according to the design regulations or the requirements of different structural types. When the length of the sliding wire is greater than 200m, a telescopic device shall be installed. Engineering 6 Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
2.0.11.2 The connection of the safety sliding wire shall be straight, the bracket clamp shall be firmly installed, and the distance between each bracket clamp shall be less than 3m.
2.0.11.3 When the installation of the safety sliding wire bracket is not specified in the design, it is advisable to weld it on the pad under the track: when it is fixed in other places, the grounding connection shall be well done, and the grounding resistance shall be less than 40.
The insulating sheath of the safety sliding wire shall be intact and shall not have cracks or damage.
2.0.11.5 The tension spring of the sliding connector should be intact and flexible, the wear-resistant graphite sheet should be in reliable contact with the sliding wire, there should be no arcing when sliding, and the connecting soft cable should meet the requirements of current carrying capacity. 2.0.12 The installation of the sliding connector should meet the following requirements: 2.0.12.1 The fixing of the sliding connector bracket should be reliable, the insulator and the insulating pad should not have defects such as cracks and damage, the insulation of the conductive part to the ground should be good, and the distance between the phases and the ground should meet the relevant provisions of Article 2.0.3 of this specification. 2.0.12.2 The sliding connector should be in reliable contact along the entire length of the sliding wire and slide freely and unimpeded. The center line (wide surface) of the sliding connector should not exceed the edge of the sliding wire at any part. 2.0.12.3 The contact part between the sliding connector and the sliding wire should not have sharp edges; the pressure of the compression spring should meet the requirements.
The slotted sliding connector and the adjustable sliding rod should move flexibly. 2.0.12.5
The wheel type sliding connector of the free suspension sliding connection shall be higher than the middle bracket of the sliding connection after installation, and shall not be less than 10mm.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
3 Wiring
3.0.1 The wiring on the crane shall meet the following requirements: 3.0.1.1 Except for the weak current system, the wiring on the crane shall use copper core multi-strand wires or cables with a rated voltage of not less than 500V. The cross-sectional area of multi-strand wires shall not be less than 1.5mm2; the cross-sectional area of multi-strand cables shall not be less than 1.0mm2. 3.0.1.2 In areas susceptible to mechanical damage, heat radiation or dripping of lubricating oil, wires or cables shall be installed in steel pipes, wire troughs, protective covers or take heat insulation protection measures. 3.0.1.3 Where wires or cables pass through holes in steel structures, the burrs of the holes shall be removed and protective measures shall be taken.
3.0.1.4 The laying of cables on cranes shall meet the following requirements: (1) They shall be arranged neatly in the order of cable extraction and should not be crossed; strong and weak current cables should be laid separately, and there should be labels on both ends of the cables; (2) Fixed cables should be clamped, and the distance between support points should not be greater than 1m; (3) When the cables are fixedly laid, their bending radius should be greater than 5 times the outer diameter of the cables; when the cables are mobile, their bending radius should be greater than 8 times the outer diameter of the cables. 3.0.1.5
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 marked with obvious wiring numbers. 3.0.2 The laying of wire pipes and cable ducts on cranes shall meet the following requirements: 3.0.2.1 Steel pipes and cable ducts should be firmly fixed. 3.0.2.2
The steel pipes of open-air cranes should be laid with the pipe openings facing downward or with other waterproof measures.
All pipe openings of cranes should be equipped with mouth guards. 3.0.2.4 The installation of cable ducts shall comply with the requirements for laying wires or cables, and protective measures shall be taken at the inlet and outlet of wires or cables.
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