This specification is applicable to general low-voltage electrical appliances with rated voltage of 50Hz AC and below and rated voltage of 1500V and below DC under normal conditions for installation and adjustment test. It is not applicable to household appliances that do not require fixed installation, power system protection appliances, electrical instruments and meters, transmitters, electronic computer systems, and installation and acceptance of complete sets of cabinets and boxes. GB 50254-1996 Specification for Construction and Acceptance of Low-voltage Electrical Appliances for Electrical Installation Engineering GB50254-1996 Standard download decompression password: www.bzxz.net

Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
50254-96
Electrical Equipment Installation Engineering
Code for Construction and Acceptance of Low-voltage Electrical Equipment
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 Equipment Installation Engineering
Code for Construction and Acceptance of Low-voltage Electrical Equipment
Code for Construction and Acceptance of Cow-voltage ApparatusElectrical Equipment Installation engineering50254—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 No. Jizong [1986] 2630 and the Ministry of Construction's document No. (91) Jianbiaoji Zi No. 6, 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" GB5025496, "Construction and Acceptance Specification for Power Converter Equipment in Electrical Installation Engineering" GB5025596, "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 on 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 Construction Research Institute is responsible for the specific interpretation, and the Ministry of Construction 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
General Provisions
Low-voltage circuit breakers
Low-voltage disconnectors, knife switches, transfer switches and fuse combination appliancesResidential appliances, leakage protectors and fire protection electrical equipmentLow-voltage contactors and motor starters
Controllers, relays and travel switches
Resistors and varistors
Electromagnets
Fuse
Project acceptance and acceptance
Additional instructions
Standardized wording
Engineering Construction Standards Full Text Information System
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Engineering Construction Standard Full Text Information System
1 General Provisions
1.0.1 This specification is formulated to ensure the installation quality of low-voltage electrical appliances, promote the advancement of construction and installation technology, and ensure the safe operation of equipment after installation. 1.0.2 This specification is applicable to general low-voltage electrical appliances with an AC 50Hz rated voltage of 1200V and below and a DC rated voltage of 1500V and below, which are installed and adjusted under normal conditions. It is not applicable to the installation and acceptance of household appliances that do not require fixed installation, power system protection appliances, electrical instruments and meters, transmitters, electronic computer systems, and complete sets of electrical appliances on panels, cabinets, and boxes.
The installation of low-voltage electrical appliances should be carried out according to the approved design. 1.0.4 The transportation and storage of low-voltage electrical appliances should comply with the provisions of the current relevant national standards; when there are special requirements for the product, it should comply with the requirements of the product technical documents. 1.0.5 The storage period of low-voltage electrical equipment and instruments before installation should be one year or less. When the storage period is exceeded, the special regulations for the storage of equipment and instruments should be met. 3 The equipment and instruments used should comply with the provisions of the current national technical standards and 1.0.6
should have qualification certificates, and the equipment should have nameplates. 1.0.7 After the equipment and instruments arrive at the site, the following acceptance inspections should be carried out in a timely manner: 1.0.7.1 The packaging and sealing should be good.
2 The technical documents should be complete and there should be a packing list. 1.0.7.2
1.0.7.3 Check and count according to the packing list. The specifications and models should meet the design requirements; accessories and spare parts should be complete.
1.0.7.4 Perform an appearance inspection according to the requirements of this specification. 1.0.8 The safety and technical measures during construction should comply with the provisions of the current national safety and technical standards and product technical documents.
9 The construction of building projects related to the installation of low-voltage electrical appliances shall meet the following requirements:
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
The construction quality of buildings and structures related to the installation of low-voltage electrical appliances shall meet the relevant provisions of the current national construction and acceptance specifications. When there are special requirements for equipment or design, they shall also meet their requirements. 1.0.9.2 Before installing low-voltage electrical appliances, the construction project shall meet the following conditions: (1) The roof and floor slab shall be completed and shall not leak. (2) Formwork, scaffolding, etc. that hinder the installation of electrical appliances shall be removed and the site shall be cleaned.
(3) The indoor ground base shall be completed and the plastering elevation shall be marked on the wall. (4) The environmental humidity shall meet the design requirements or the provisions of the product technical documents. (5) The doors, windows, walls and decorative sheds of the electrical room, control room and operation room shall be completed and the floor shall be smoothed.
(6) The equipment foundation and frame should reach the strength that allows the equipment to be installed; the quality of the welded components should meet the requirements, and the foundation channel steel should be fixed reliably. (7) The position and size of the embedded parts and reserved holes should meet the design requirements, and the embedded parts should be firm.
After the equipment is installed and put into operation, the construction project should meet the following requirements (1) The doors and windows are installed.
(2) The construction work that cannot be carried out after operation and affects the safe operation is completed. (3) The damaged parts of the building caused by the construction should be repaired. 1.0.10 Before the equipment is installed and put into operation, protective work should be done. 1.0.11 In addition to the provisions of this specification, the construction and acceptance of low-voltage electrical appliances shall also comply with the provisions of the relevant national standards and specifications in force. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
General Provisions
2.0.1 The inspection before installation of low-voltage electrical appliances shall meet the following requirements: 2.0.1.11
The nameplate, model, and specifications of the equipment shall be consistent with the controlled circuit or design. The outer shell, paint layer, and handle shall be free of damage or deformation. 2.0.1.2
Internal instruments, arc extinguishing hoods, porcelain and bakelite electrical appliances shall be free of cracks or scars. 2.0.1.4 The screws shall be tightened.
For low-voltage electrical appliances with main contacts, the contact of the contacts shall be tight, and the pressure on both sides of the contact shall be uniform when checked with a 0.05mmX10mm feeler gauge. 2.0.1.6
The accessories shall be complete and intact.
2.0.2 The installation height of low-voltage electrical appliances shall comply with the design regulations; when there are no regulations in the design, the following requirements shall be met:
1 The bottom of the low-voltage electrical appliances installed on the ground should be 50 to 2.0.2.1wwW.bzxz.Net
100mm above the ground.
The distance between the center of the operating handle shaft and the ground should be 1200 to 2.0.2.2
1500mm; the distance between the handle for side operation and the building or equipment should not be less than 200mm.
2.0.3 The fixing of low-voltage electrical appliances shall comply with the following requirements: 2.0.3.1 Low-voltage electrical appliances can be fixed to walls, columns or other building components by brackets, metal plates or insulating plates according to their different structures. Metal plates and insulating plates should be flat; when using rails for support and installation, the rails should match the low-voltage electrical appliances and be tightly fixed to the wall panels with fixing clips or fixing bolts. It is strictly forbidden to use deformed or unqualified rails. 2.0.3.2 When using expansion bolts for fixing, the bolt specifications should be selected according to the product technical requirements. The drilling diameter and design depth should be consistent with the bolt specifications. 2.0.3.3 Fasteners should be galvanized products, bolt specifications should be selected appropriately, and the fixing of electrical appliances should be firm and stable.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
2. 0. 3. 4
Electrical appliances with earthquake resistance requirements should be equipped with shock-absorbing devices: measures should be taken to prevent loosening of the fastening bolts.
2.0.3.5 When fixing low-voltage electrical appliances, the internal part of the electrical appliances shall not be subjected to additional stress. 2.0.4 The external wiring of electrical appliances shall meet the following requirements: 2.0.4.1 The wiring shall be carried out according to the terminal markings. 2.0.4.2
The wiring shall be arranged neatly, clearly and beautifully, and the insulation of the wires shall be good and lossless. The incoming wire on the power supply side shall be connected to the incoming wire terminal, that is, the fixed contact terminal; the outgoing wire on the load side shall be connected to the outgoing wire terminal, that is, the movable contact terminal. 2.0.4.4 The wiring of electrical appliances should use copper or electroplated metal anti-rust layer bolts and butterfly nails. The connection should be tight and have anti-loosening devices. External wiring must not cause additional stress inside the appliance. 2.0.4.5
When the busbar is connected to the appliance, the contact surface should comply with the relevant provisions of the current national standard "Construction and Acceptance Specifications for Busbar Installation Engineering of Electrical Devices". The minimum electrical clearance of busbars of different phases at the connection point shall comply with the provisions of Table 2.0.4. Minimum electrical clearance of busbars of different phases
Rated voltage (v)
U≤500
500
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