This specification is applicable to the design of low-voltage power distribution with AC and power frequency below 500V for new and expanded projects. GB 50054-1995 Low-voltage power distribution design specification GB50054-1995 Standard download decompression password: www.bzxz.net

Engineering Construction Standard Full Text Information System
National Standard of the People's Republic of China
GB50054—95
Code for design of low voltage electrial installations
1995—12—26
1996—06—01
State Bureau of Technical Supervision
Ministry of Construction of the People's Republic of China
Engineering Construction Standard Full Text Information System
Jointly Issued
Engineering Construction Standard Full Text Information System
National Standard of the People's Republic of China
Code for design of low voltage electrial installations installationsGB50054-95
Editor: Ministry of Machinery Industry of the People's Republic of ChinaApproval department: Ministry of Construction of the People's Republic of ChinaEffective date: June 1, 1996
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Notice on the release of the national standard
"Low Voltage Distribution Design Specification"
Jianbiao [1995] No. 325
According to the requirements of the State Planning Commission's document [1986] No. 250, the "Low Voltage Distribution Design Specification" jointly revised by the former Ministry of Machinery and Electronics Industry and relevant departments has been reviewed by relevant departments. The "Low Voltage Distribution Design Specification" GB50054-95 is now approved as a mandatory national standard and will be implemented from June 1, 1996. The former national standard "Low Voltage Distribution Equipment and Line Design Specification" GBJ54-83 will be abolished at the same time. The Ministry of Machinery Industry is responsible for the management of this specification, and the specific interpretation and other work is the responsibility of China Machinery and Electronics Design Institute, and the publication and distribution is organized by the Standard and Quota Research Institute of the Ministry of Construction. Ministry of Construction of the People's Republic of China
December 26, 1995
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Revision Notes
This specification is edited by the former Ministry of Machinery and Electronics Industry in accordance with the requirements of the State Planning Commission's Document No. 250 [1986], and is specifically revised by the former Ministry of Machinery and Electronics Industry's China Electronics Design Institute and relevant units to jointly revise the "Low Voltage Distribution Equipment and Line Design Specification" (GBJ54-83). During the revision process, the specification group conducted extensive investigations and studies, carefully summarized the experience since the implementation of the specification, absorbed some scientific research results, and widely solicited opinions from relevant units across the country. Finally, our ministry and relevant departments reviewed and finalized it.
The main content of this revision is to get closer to the International Electrotechnical Commission (IEC) standards. In the protection of distribution lines, in order to prevent indirect electric shock to people, damage to electrical lines and electrical fires, the international electrical standards are fully adopted. For the layout of distribution equipment, the safety measures are also revised with reference to the international electrical standards. In the laying of lines, the provisions for the design of cable trays and cable shafts are added, and the relevant provisions are supplemented and revised due to the renewal and replacement of electrical products.
During the implementation of this specification, if it is found that there are places that need to be revised and supplemented, please send your opinions and relevant materials to the China Machinery and China Electric Design Institute of the Ministry of Machinery Industry (address: No. 1 Lianhuahe Hutong, Guang'anmenwai, Beijing; postal code: 100055), and copy it to the Industry Development Department of the Ministry of Machinery Industry for reference in future revisions. Ministry of Machinery Industry
July 1995
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Chapter 1 General
Chapter 2
Selection of Electrical Appliances and Conductors.
Section 1
Section 2
Chapter 3
Section 1
Section 2
Section 3
Chapter 4
Section 1
Section 2
Section 3
Section 4
Section 5
Chapter 5
Section 1
Section 2
Selection of Electrical Appliances
Selection of Conductors
Layout of distribution equipment
General provisions
Safety measures in the layout of distribution equipment·bZxz.net
Requirements for buildings:
Protection of distribution lines
General provisions
Short-circuit protection
Overload protection
Ground fault protection
Insulation location of protective devices
Laying of distribution lines
General provisions
Insulated wire wiring
Section 3 Cable Wiring
Section 4
Section 5
Section 6
Section 7
Appendix 1
Bare Conductor Wiring
Enclosed Busbar Wiring·
Cable Wiring
Vertical Shaft Wiring
Terms Explanation
Appendix 3
Explanation of Terms Used in This Code
Additional Explanation·
Engineering Construction Standards Full text information system
：(11)
（14)
：(21)
（27)
Engineering construction standard full text information system
Chapter 1 General
Article 1.0.1 This specification is formulated to ensure that low-voltage power distribution design implements the national technical and economic policies, ensures personal safety, reliable power distribution, qualified power quality, saves power, has advanced technology, is economically reasonable, and is easy to install and maintain. Article 1.0.2
This specification is applicable to the design of low-voltage power distribution with AC and power frequency below 500V for new and expanded projects.
Article 1.0.3 Low-voltage power distribution design should save non-ferrous metals and reasonably select copper and aluminum conductors.
Article 1.0.4
In addition to implementing this specification, low-voltage power distribution design should also comply with the provisions of the current relevant national standards and specifications. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 2
Selection of Electrical Appliances and Conductors
Section 1 Selection of Electrical Appliances
Article 2.1.1 The electrical appliances selected for low-voltage power distribution design shall comply with the relevant national standards in force and shall meet the following requirements. 1. The rated voltage of the electrical appliance shall be compatible with the nominal voltage of the circuit in which it is located; 2. The rated current of the electrical appliance shall not be less than the calculated current of the circuit in which it is located; 3. The rated frequency of the electrical appliance shall be compatible with the frequency of the circuit in which it is located; 4. The electrical appliance shall adapt to the environmental conditions of the location; 5. The electrical appliance shall meet the requirements of dynamic stability and thermal stability under short-circuit conditions. Electrical appliances used to disconnect short-circuit currents shall meet the breaking capacity under short-circuit conditions. Article 2.1.2 When calculating the breaking capacity of electrical appliances under short-circuit conditions, the effective value of the periodic component of the expected short-circuit current at the installation location shall be used. When the sum of the rated currents of the motors connected near the short-circuit point exceeds 1% of the short-circuit current, the influence of the motor feedback current shall be taken into account.
When the power supply needs to be disconnected for maintenance, testing and overhaul of equipment, Article 2.1.3
isolating appliances shall be installed.
Article 2.1.4 Isolating appliances shall isolate the circuits in which they are located from the live parts. When the misoperation of the isolating appliances may cause serious accidents, measures shall be taken to prevent misoperation. Article 2.1.5 Isolating appliances shall adopt switches that simultaneously disconnect all poles of the power supply or single-pole switches that are close to each other.
Article 2.1.6 Isolating appliances may adopt the following appliances: 1. Single-pole or multi-pole isolating switches and isolating plugs; 2. Plugs and sockets;
3. Connectors;
4. Special terminals that do not require the removal of wires; 5. Fuse.
Engineering 2 Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Article 2.1.7 Semiconductor appliances are strictly prohibited from being used as isolating appliances. Article 2.1.8 The following electrical appliances can be used for operating the current: 1. Load switches and circuit breakers;
2. Relays and contactors;
3. Semiconductor appliances;
4. Plugs and sockets of 10A and below.
Section 2 Selection of Conductors
Article 2.2.1 The type of conductor shall be selected according to the laying method and environmental conditions. In addition to meeting the above conditions, the insulated conductor shall also meet the requirements of the working voltage. Article 2.2.2 The selection of conductor cross-section shall meet the following requirements: 1. The line voltage loss shall meet the requirements of the terminal voltage during normal operation and starting of the electrical equipment;
2. The current carrying capacity of the conductor determined by the laying method and environmental conditions shall not be less than the calculated current;
3. The conductor shall meet the requirements of dynamic stability and thermal stability; 4. The minimum cross-section of the conductor shall meet the requirements of mechanical strength, and the minimum core wire cross-section of the fixedly laid wire shall comply with Table 2.2.2. Minimum core wire section of fixedly laid conductors
Laying method
Bare conductors laid on insulators
Insulated conductors laid on insulators:
Indoors and outdoors
2>L≤6m
2
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.