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GB/T 7251.5-2025: Low-voltage switchgear and controlgear assemblies - Part 5: Assemblies for power distribution in public networks
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 7251.5-2025	English	754	Add to Cart	6 days [Need to translate]	Low-voltage switchgear and controlgear assemblies - Part 5: Assemblies for power distribution in public networks
GB/T 7251.5-2017	English	679	Add to Cart	5 days [Need to translate]	Low-voltage switchgear and controlgear assemblies -- Part 5: Assemblies for power distribution in public networks
GB 7251.5-2008	English	879	Add to Cart	4 days [Need to translate]	[GB/T 7251.5-2008] Low-voltage switchgear and controlgear assemblies -- Part 5: Particular requirements for assemblies for power distribution in public networks
GB 7251.5-1998	English	719	Add to Cart	3 days [Need to translate]	Low-voltage switchgear and controlgear assemblies Part 5: Particular requirements for assemblies intended to be installed outdoors in public places--Cable distribution cabinets (CDCs)for power distribution in networks

GB/T 7251.5-2025: Low-voltage switchgear and controlgear assemblies - Part 5: Assemblies for power distribution in public networks

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ICS 29.130.20 CCSK31 National Standards of the People's Republic of China Replaces GB/T 7251.5-2017 Low-voltage switchgear and controlgear Part 5.Complete Power Distribution Equipment for Public Power Grids (IEC 61439-5.2023, IDT) Published on 2025-12-02 Implemented on July 1, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Table of contents

Preface III Introduction V 1.Scope 1 2 Normative References 2 3 Terms and Definitions 4.Symbols and Abbreviations 5 Interface Characteristics 4 6 Information 4 7.Usage conditions 5 8.Structural Requirements 5 9 Performance Requirements 7 10 Design Validation 7 11 Routine Inspection 18 Appendix L (Informative) Guidelines for Temperature Rise Tests 20 Appendix AA (Normative) Conductor Cross-sectional Area 21 Appendix BB (Informative) Item 23 of the Agreement between the Complete Equipment Manufacturer and the User Appendix CC (Informative) Design Validation 27 Appendix DD (Informative) List of Notes for Certain Countries 29 References 30

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document is Part 5 of GB/T 7251 "Low-voltage switchgear and controlgear assemblies". GB/T 7251 has published the following... part. ---Part 1.General Provisions; ---Part 2.Complete sets of power switchgear and control equipment; ---Part 3.Distribution Boards (DBOs) Operated by General Personnel; ---Part 4.Specific requirements for construction site complete sets of equipment (ACS); ---Part 5.Complete sets of power distribution equipment for public power grids; ---Part 6.Busbar Trunk System (Busway); ---Part 7.Complete sets of equipment for specific applications such as docks, campsites, market squares, and electric vehicle charging stations; ---Part 8.General Technical Requirements for Intelligent Complete Sets of Equipment; ---Part 10.Guidelines for complete sets of equipment. This document replaces GB/T 7251.5-2017 "Low-voltage switchgear and controlgear assemblies - Part 5.Power distribution in public power grids". Compared with GB/T 7251.5-2017, the main technical changes in "Complete Sets of Equipment" are as follows, except for structural adjustments and editorial modifications. ---The scope of the file has been changed to include applications for DC (see Chapter 1, Chapter 1 of the.2017 edition); ---The application of power generation sources and electric vehicle charging infrastructure in the assumed load factor has been increased (see Table 101); ---Added requirements for protection against mechanical impacts (IK code), stipulating that the mechanical impact test required in this document must be at least IK10. (See 8.2.1); ---The special requirements for thermal stability and the dry heat test have been removed (sections 8.1.101 and 10.2.3.101 in the.2017 edition); ---Added more detailed descriptions of representative samples used in design validation (see 10.1); ---The impact resistance and corner impact resistance tests in the mechanical strength verification have been modified when the shell is made of metal. The requirement to conduct mechanical tests at -25°C was omitted (see 10.2.101.5.1, 10.2.101.8, and 10.2 in the.2017 edition). 101.5.1 and 10.2.101.8); ---Added additional dielectric tests when using PENDA in distribution substations with separate high-voltage and low-voltage grounding (see 10.9). 2.101). This document is equivalent to IEC 61439-5.2023 "Low-voltage switchgear and controlgear assemblies – Part 5.Power distribution in public power grids". Complete set of equipment. The following minimal editorial changes have been made to this document. ---Incorporates amendments to IEC 61439-5.2023/COR1.2025; the relevant clauses are indicated by vertical margins. The double lines (‖) are marked; ---Changes to the notes in the "Terms and Definitions" element; ---Correction of typographical error. Chapter 1, "PENDA may include control and/or signaling devices associated with power distribution," has been updated to include... Replace “/” with “and/or”; ---Correction of printing error. In section 10.2.101.1, "except for the tests in section 10.2.101.8 of this part" is changed to "except for the tests in section 10.2.101.6 of this part". Outside of the experiment; ---Corrected a printing error. Add "or DC 1500V" to the "Options listed in this document" section of the "Nominal Voltage (V)" row in Table BB.1. Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed by the China Electrical Equipment Industry Association. This document is under the jurisdiction of the National Technical Committee on Standardization of Low-Voltage Switchgear and Control Equipment (SAC/TC266). This document was drafted by. Tianjin Electrical Science Research Institute Co., Ltd., Tianjin Tianchuan Electrical Control Equipment Testing Co., Ltd., and Jubang Group Co., Ltd. The company, Hangzhou Zhetai Electric Co., Ltd., Guangdong Bailin Electric Equipment Factory Co., Ltd., Henan Ruier Electric Co., Ltd., Hangzhou Zhijiang Opening Guan Co., Ltd., Guangdong Henggang Electric Technology Co., Ltd., Jiangsu Hongqiang Electric Group Co., Ltd., and Shanghai Baolin Electric Group Co., Ltd. Limited Liability Company, Anhui Longbo Electric Co., Ltd., Shenghui Intelligent Technology Co., Ltd., Zhejiang Chint Electric Technology Co., Ltd., Hangzhou Huachuang High-Tech Co., Ltd. Ke Co., Ltd., Hongguang Electric Group Co., Ltd., Jiangsu Huaqiang Electric Equipment Co., Ltd., Zhuhai Boway Electric Co., Ltd., Yangzhong City Inspection and Testing Center, Jiangsu Provincial Power Distribution Equipment Product Quality Inspection and Testing Center, Nortel Technology (Guangdong) Co., Ltd., Zhejiang Dahongmen Power Equipment Equipment Co., Ltd., Changyou Electric Co., Ltd., Zhejiang Kangge Electric Co., Ltd., Shide Electric Group Co., Ltd., Zhejiang Westinghouse Electric Co., Ltd. Limited Company, Shenzhen Jinqihui Electric Co., Ltd., Shandong Luneng Energy Electric Equipment Co., Ltd., Huatuo Electric Power Equipment Group Co., Ltd., Zhejiang Jingshun Power Equipment Co., Ltd., Tailijiye Co., Ltd., Guanghong Electric Co., Ltd., Jiaozuo Dongfang Xiangsheng Electric Co., Ltd., Zhejiang Jiangpucheng Electric Co., Ltd., Zhejiang Baigu Electric Technology Co., Ltd., Xiangxing Electric Co., Ltd., Jiangxi Huanlin Group Co., Ltd. Company, Jiangsu Weiteng Power Distribution Co., Ltd., Zhejiang Tianshun Fiberglass Co., Ltd., Zhejiang Fangyuan Electrical Equipment Testing Co., Ltd., Shanghai Huajian Switch Limited Liability Company, Guangdong Owent Electric Co., Ltd., Zhejiang Canature Electric Technology Co., Ltd., Shanghai Outong Electric Co., Ltd., Shandong Taikai Electric Gong Electric Appliance Co., Ltd., Wuxi Kaiyi Technology Co., Ltd., Jiakong Power Co., Ltd., Shandong Deyuan Power Technology Co., Ltd., and Hang Bian Dian Power Technology Co., Ltd., Shanghai Yijun Electric Co., Ltd., Ningbo Yaohua Electric Technology Co., Ltd., Yuguang Electric Co., Ltd., Hebei Beiheiniu Power Fittings Co., Ltd., Ningbo Jingtuo Electrical Equipment Co., Ltd., Andeli Group Co., Ltd., Guoyuan Electric Co., Ltd., Jiangsu HNA Electric Technology Co., Ltd., Shandong Wansheng Electric Co., Ltd., Anyiji Electric Industrial Systems (Shanghai) Co., Ltd., Shenheng Power Equipment Limited Liability Company, Zhejiang Jingyang Electric Co., Ltd., Yangzhou Deyun Electric Equipment Group Co., Ltd., Zhejiang Maofeng Electric Co., Ltd., Guangdong Nanhua Xi'an Electric Co., Ltd., Shandong Hongri Dongsheng Technology Co., Ltd., Meiyi Electric Co., Ltd., Zhejiang Shuntang Power Technology Co., Ltd., and Xinlan Group Group Co., Ltd., Shanghai Aoda Technology Group Co., Ltd., Zhongtai Technology Co., Ltd., Anhui Zhongzhi Electric Technology Testing Co., Ltd., and Shilian Testing (Zhejiang) Co., Ltd., Pinno Electric Technology Co., Ltd., Hangzhou Naili Electric Co., Ltd., Sanyao Electric Co., Ltd., Wuxi Shuanghuan Electric Co., Ltd. Limited Company, Huntsman (Hangzhou) Power Technology Co., Ltd., Guangdong Guangxin Technology Co., Ltd., Zhejiang Zhongxing Explosion-proof Equipment Co., Ltd., Nanjing Zheng Rui Electric Power Technology Co., Ltd., Ningbo AUX Intelligent Technology Co., Ltd., Xinjiang TBEA Automation Equipment Co., Ltd., Beijing Herui CERNET Power Technology Co., Ltd., Bofang Electric Co., Ltd., Guangdong Cisco General Power Technology Co., Ltd., and TIM Electric (Hangzhou) Co., Ltd. Limited Liability Company, Guangdong Kehua Electric Technology Co., Ltd., Jiangsu Haitong Electric Co., Ltd., Ray-Ban Electric Group Co., Ltd., Henan Yuhe Electric Gas Co., Ltd., Yuanzhong Electric Co., Ltd., Guangdong Jingcheng Power Equipment Co., Ltd., Hunan Kangpu Communication Technology Co., Ltd., Sichuan Zhongxin General Electric Energy Co., Ltd., and Zhejiang Juhongkai Intelligent Electric Co., Ltd. The main drafters of this document are. Wang Yang, Liu Jie, Yang Jianmin, Zhang Chen, Huang Songjie, Zhu Guitao, Lü Peihe, Zhuang Yaoding, Tao Qixiong, and Dai Hongbing. Song Jianfeng, Zhao Jian, Yu Xiangyong, Hou Yinshun, Zhu Shengjun, Lin Baiyang, Chen Yingchao, Zhou Diehui, Chen Hongxia, Yang Wei, Lin Chengxin, Zhou Caili, Liu Jiajin Shi Zhenzhong, He Kaiqiang, Zheng Tianhao, Chen Bing, Zhang Lu, Li Xianpeng, Lin Shaoke, Xu Jianying, Xiong Zhonghua, Feng Xiangkun, Bao Yuran, Huang Yingbo, Chen Guyu Hong Xingxing, Bi Zhidao, Wang Kaifan, Zhang Huajun, Hu Junben, Zheng Ke, Chen Qianqian, Xiang Zhangfeng, Jiang Guoliang, Gu Jiawei, Wang Cong, Li Fengsheng, Ye Shihao Liu Bo, Wang Jingru, Shi Bin, Liu Hongliang, Lü Enlin, Cheng Baiyuan, Qian Lichu, Ruan Liheng, Shan Hao, Lu Yongguang, Liu Jilong, Wang Xiaobo, Yuan Jinfeng Yao Maofa, Xiang Huaping, Yang Changgang, Huang Zhijun, Wang Yao, Zheng Weihang, Nan Peihe, Zhang Zige, Cui Tao, Shi Wenjie, Zhang Hanhua, Guan Yinqia, Han Xiaofei Zhang Guangsong, Lin Cunpeng, Cai Xianzheng, Zhao Lizhi, Wang Chunlai, Liu Zhongcheng, Ren Feng, Chen Ping, Sun Ke, Lu Chuan, Huang Xieyun, Qiu Guoxing, Xiong Cunling Zhong Xinguo, Zhang Zedong, Wang Xiaole, Huang Chengzhang, Zhang Xueqian, Li Xia, Wang Xingwang. The release history of this document and the document it replaces is as follows. ---First published in.1998 as GB 7251.5-1998; ---First revised in.2008, and the number was adjusted to GB/T 7251.5-2008 in.2017; ---Second revision in.2017; ---This is the third revision.

Introduction

GB/T 7251 adopts the IEC international standard to meet the needs of international trade, technology and economic exchanges. This document is a product standard and should be used in conjunction with GB/T 7251.1. GB/T 7251 is proposed to consist of nine parts. ---Part 1.General Provisions. This section aims to specify the general requirements for various types of complete sets of equipment standards. ---Part 2.Complete Assemblies of Electrical Switchgear and Control Systems. This section aims to specify the specific requirements and verification procedures for complete assemblies of electrical switchgear and control systems. method. ---Part 3.Distribution Boards Operated by General Personnel (DBO). This section specifies the particular requirements for distribution boards operated by general personnel. And verification methods. ---Part 4.Specific Requirements for Complete Sets of Equipment (ACS) for Construction Sites. This section aims to specify the specific requirements for complete sets of equipment for construction sites. Requirements and verification methods. ---Part 5.Power Distribution Systems for Public Utility Networks. This section aims to specify the particular requirements for power distribution systems for public utility networks. Verification method. ---Part 6.Busbar Trunk Systems (Bus Trunking). This section aims to specify the particular requirements and verification methods for bus trunking. ---Part 7.Complete sets of equipment for specific applications such as docks, campsites, market squares, and electric vehicle charging stations. This aims to specify specific applications... Specific requirements and verification methods for the complete set of equipment used. ---Part 8.General Technical Requirements for Intelligent Complete Equipment. This section aims to specify the specific requirements for intelligent complete equipment, such as network connectivity. Connection, remote sensing, remote control functions, and their verification methods. ---Part 10.Guidelines for Complete Systems. This section aims to provide application guidelines for users of complete systems. Low-voltage switchgear and controlgear Part 5.Complete Power Distribution Equipment for Public Power Grids

1 Scope

This document specifies the requirements for Public Grid Distribution Equipment (PENDA). PENDA meets the following requirements. ---For three-phase systems and DC systems with a rated voltage not exceeding AC 1000V (see typical distribution network in Figure 101) not exceeding DC 1500V power distribution; ---Fixed; ---Open-type complete sets of equipment are not included in this document; ---Suitable for installation in locations accessible only to skilled technicians; outdoor installations may be installed in locations accessible to the general public. ● Intended for energy distribution in the public power grid; ● Indoor use. Complete sets of equipment installed in power substations; ● Outdoor use. Suitable for outdoor installation of complete sets of equipment including enclosures. This document aims to define PENDA, specifying its usage conditions, structural requirements, technical characteristics, and testing. For certain power grid parameters... The number of tests may allow for higher performance levels. PENDA may include control and/or signaling devices associated with power distribution. Note 1.Control and monitoring devices may be used in smart grid applications or for the transmission of smart grid data. This document applies to all PENDA designs, manufactures, or are fully standardized and mass-produced. The manufacturer and/or assembler may not be the original manufacturer (see 3.10.1 of GB/T 7251.1-2023). This document does not apply to standalone devices and assembled components that conform to relevant product standards, such as motor starters, fuse switches, and electrical components. Sub-equipment, etc. If the substation is owned or operated by a public distribution system operator (DSO), then the substation is used as a low-voltage switchboard. PENDA falls within the scope of this document. This document does not apply to certain types of assemblies covered by other parts of IEC 61439. ...