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GB/T 7251.10-2025: Low-voltage switchgear and controlgear assemblies - Part 10: Guidance to specifying assemblies
Status: Valid GB/T 7251.10: Evolution and historical versions
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| GB/T 7251.10-2025 | English | 1154 |
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Low-voltage switchgear and controlgear assemblies - Part 10: Guidance to specifying assemblies
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GB/T 7251.10-2025
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| GB/T 7251.10-2014 | English | 994 |
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Low-voltage switchgear and controlgear assemblies -- Part 10: Guidance to specifying assemblies
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GB/T 7251.10-2014
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Standard similar to GB/T 7251.10-2025 GB/T 7251.7 GB/T 7251.2 GB/T 7251.1 Basic data | Standard ID | GB/T 7251.10-2025 (GB/T7251.10-2025) | | Description (Translated English) | Low-voltage switchgear and controlgear assemblies - Part 10: Guidance to specifying assemblies | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | K31 | | Classification of International Standard | 29.130.20 | | Word Count Estimation | 58,579 | | Date of Issue | 2025-08-01 | | Date of Implementation | 2026-02-01 | | Older Standard (superseded by this standard) | GB/T 7251.10-2014 | | Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China | GB/T 7251.10-2025: Low-voltage switchgear and controlgear assemblies - Part 10: Guidance to specifying assemblies
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT7251.10-2025
ICS 29.130.20
CCSK31
National Standard of the People's Republic of China
Replaces GB/T 7251.10-2014
Low-voltage switchgear and control equipment
Part 10.Guidelines for specifying complete equipment
Released on August 1, 2025
Implementation on February 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
Introduction V
1 Scope 1
2 Normative references 1
3 Terms and Definitions 2
4 Application of complete sets of equipment in IEC 61439 (all parts) 2
5 Electrical System 4
6 Short circuit withstand capability 7
7 Personnel protection against electric shock10
8 Installation Environment 12
9 Installation Method 21
10 Storage and loading and unloading 23
11 Operation Requirements 24
12 Maintenance and upgrade capabilities 25
13 Current carrying capacity 29
14 Complete Equipment Design Verification and Routine Inspection Process 31
Appendix A (Informative) Cross-sectional area of copper cables suitable for connection to external cable terminals 33
Appendix B (Informative) Internal Isolation Form (See 12.8) 34
Appendix C (Informative) Specification Template for Complete Equipment 40
Appendix D (Informative) Optional Information 44
Appendix E (Informative) List of Notes for Certain Countries 47
Reference 48
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document is Part 10 of GB/T 7251 "Low-voltage switchgear and controlgear assemblies". GB/T 7251 has been published as follows
part.
--- Part 1.General provisions;
--- Part 2.Complete power switchgear and control equipment;
--- Part 3.Distribution board operated by general personnel (DBO);
--- Part 4.Particular requirements for construction site complete equipment (ACS);
--- Part 5.Complete equipment for power distribution in public grids;
--- Part 6.Busbar trunk system (bus duct);
--- 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 equipment;
--- Part 10.Guidance for specifying complete equipment.
This document replaces GB/T 7251.10-2014 "Low-voltage switchgear and controlgear Part 10.Specification of complete sets of equipment"
Compared with GB/T 7251.10-2014, in addition to structural adjustments and editorial changes, the main technical changes are as follows.
--- Added the description of short-circuit withstand capability when the complete set of equipment is connected to multiple input power supplies (see 6.8);
--- Added the description of solar irradiance in radiation resistance (see 8.5.2);
--- Added a description of the pollution level under special conditions of use (see 8.12.7);
--- Added detailed description of the basic principles of internal isolation (see 12.8.1);
--- Added new content on current rating data (see Chapter 13).
This document is equivalent to IEC TR61439-0.2022 "Low-voltage switchgear and controlgear Part 0.Specification of complete sets of equipment
Guidelines for the implementation of the WTO's
The following minimal editorial changes have been made to this document.
--- In order to coordinate with the existing standards, the name of the standard is changed to "Low-voltage complete switchgear and control equipment Part 10.Specification of complete equipment
Guide for the preparation of
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document is proposed by the China Electrical Equipment Industry Association.
This document is under the jurisdiction of the National Technical Committee for Standardization of Low-voltage Complete Switchgear and Control Equipment (SAC/TC266).
This document was drafted by. Tianjin Electric Science Research Institute Co., Ltd., Tianjin Tianchuan Electric Control Equipment Testing Co., Ltd., Guangdong Bailin Electric
Equipment Factory Co., Ltd., Jiangshan Xinyuan Electric Co., Ltd., Northeast Electric Power University, Dongfang Electric (Chengdu) Innovation Research Co., Ltd., Hangyuezhi
Energy Electric Co., Ltd., Hangzhou Xinmei Complete Electric Appliance Manufacturing Co., Ltd., Hangzhou Taimu Electric Co., Ltd., China Railway Third Engineering Bureau Group Electric Engineering Co., Ltd.
Co., Ltd., Nanjing Hezong Electric Power Equipment Co., Ltd., Hangzhou Yunuo Electronic Technology Co., Ltd., Tianjin Jinkai Electric Power Equipment Manufacturing Co., Ltd.
Company, Guangdong Henggang Electric Power Technology Co., Ltd., Hunan Tianwei Electric Co., Ltd., Basa Electric Technology Co., Ltd., Gonghong Electric
Co., Ltd., Chuanli Electric Co., Ltd., Zhejiang Lingfang Electric Co., Ltd., Jinlu Electric Co., Ltd., Zhejiang Beidao Technology Co., Ltd., Zhejiang
Jiangteyi Electric Co., Ltd., Hongle Group Co., Ltd., Weiteng Electric Group Co., Ltd., Liyang Electric (Tianjin) Co., Ltd., Huang Hua
Group Co., Ltd., Shandong Aipu Electrical Equipment Co., Ltd., Beijing Xingye Jianda Electric Co., Ltd., Shandong Wanhai Electric Technology Co., Ltd.,
Zhonghongtai Electric Co., Ltd., Jinyu Electric (Tangshan) Co., Ltd., Foshan Haoxiang Electric Co., Ltd., Jiangxi Yawei Electric Co., Ltd.
Co., Ltd., Qingdao Dazhimeide Electric Co., Ltd., Denggao Electric Co., Ltd., Ningbo Lixin Technology Co., Ltd., Shenglong Electric Group Co., Ltd.
Co., Ltd., Guangdong Guangxin Technology Co., Ltd., Hubei Century Senyuan Electric Group Co., Ltd., Hangzhou Ruisheng Electric Co., Ltd., Shenheng Electric Equipment Co., Ltd.
Co., Ltd., Hongqi Group Wenzhou Transformer Co., Ltd., Shenzhen Chaoyanghui Technology Co., Ltd., Zhuhai Fenglan Industrial Co., Ltd., Huahui Electric
Gas Group Co., Ltd., China Communications Service Energy Saving Technology Service Co., Ltd., Hefei Switch Factory Co., Ltd., Henan Xuji Instrument Co., Ltd.,
Jinghao Chuangruitong Electrical Equipment Co., Ltd., Far East Electric Group Co., Ltd., Zhongke Intelligent (Shandong) Co., Ltd., Zhenjiang Jiale Smart
Electric Power Technology Co., Ltd., Cangzhou Bozhen Communication Technology Co., Ltd., Holick Electric Co., Ltd., Shanghai Youbang Electric (Group) Co., Ltd.
Co., Ltd., Panjin Guanglida Electric Co., Ltd., Shenzhen Tongchang Huineng Technology Development Co., Ltd., Chongqing Wangbian Electric (Group) Co., Ltd.
Co., Ltd., Shandong Shengli Tonghai Group Dongying Tianlan Energy Saving Technology Co., Ltd., Aoton Electric Group Co., Ltd., Wuxi Hongye Automation Engineering
Co., Ltd., Zhejiang Tianqi Electric Co., Ltd., Suzhou Huayuan Electric Co., Ltd., Yinhe Electric Technology Co., Ltd., Wanma Technology Co., Ltd.
Company, Nanjing Daquan Electric Co., Ltd., Shandong Anlan Electric Power Technology Co., Ltd., Shenzhen Runchengda Electric Power Technology Co., Ltd., Shenzhen Sen
Shuqiang Electronic Technology Co., Ltd., Ningbo Gongsheng Electric Technology Co., Ltd., Shanghai Lanjian Electric Control Equipment Co., Ltd., Zhejiang Chint Electric
Technology Co., Ltd., Shendian Energy Co., Ltd., Changyuan Electric Power Technology Co., Ltd., Jiangsu Hongqiang Electric Group Co., Ltd., Yantai Dongfang
Weston Electric Co., Ltd., Dajiang Technology Group Co., Ltd., Shanke New Energy Technology (Shenzhen) Co., Ltd., Shandong Electric Group New Energy
Energy Technology Co., Ltd., Zhejiang Jinneng Electric Power Technology Co., Ltd., Xinyi Electric Power Equipment Co., Ltd., Ninghong Electric Technology Co., Ltd., Yaxuzhi
Energy Technology Co., Ltd., Chengfei Electric Technology Co., Ltd., Laiwu Luneng Kaiyuan Group Electric Co., Ltd., Jianda Electric Co., Ltd., Guangdong Yue
Special Power Group Co., Ltd., Liruite Electric Co., Ltd., Chongqing Huicheng Information Technology Co., Ltd., Rongzhong Electric Co., Ltd.,
Zhejiang Lvfeng Electric Co., Ltd., Sichuan Hanzhou Electric Co., Ltd., Jiangsu Jinli Electric Co., Ltd., TBEA Yunji Electric Co., Ltd.
Company, Fujian Senda Electric Co., Ltd., Shanghai Baolin Electric Group Co., Ltd., Shenzhen Yili Power Supply Co., Ltd., Shenghui Intelligent
Technology Co., Ltd., Hongguang Electric Group Co., Ltd., Hubei Jiji Electric Power Group Co., Ltd. Digital Detection Branch, People's Electric
Group Shanghai Co., Ltd., Anhui Huayi Electric Co., Ltd., Zhejiang Xingkong Electric Co., Ltd., Zhejiang Nanyang Power Transmission and Distribution Equipment Co., Ltd., Zhejiang
Jiang Tianzheng Electric Co., Ltd., Eaton Busbar (Jiangsu) Co., Ltd., Zhonganda Electric Technology Co., Ltd., Shenzhen Xunengda Electric
QI TECHNOLOGY LIMITED.
The main drafters of this document are. Han Yuying, Guo Peijian, Shen Zhida, Huang Songjie, Chai Weijun, Yang Yanjun, Yang Jiawei, Yang Jianfeng, Shen Dilong,
Huang Xieyun, Gu Huafeng, Lin Qi, Han Dekun, Song Guanjun, Tao Qixiong, Wang Yong, Zheng Jinfeng, Shao Leifei, Qian Peng, Zhang Xiaomao, Huang Sui'an, Gao Haoxiang,
Ni Jiangwei, Feng Junfeng, Zhou Zhong, Zheng Liyang, Chen Zhihao, Xiao Junming, Zhao Yanshuang, Wan Shunqing, Zhang Zhaolei, Chen Jinye, Gao Yabin, Liu Zhiming,
Wang Xiaozhu, Gong Jinhua, Zhang Sibao, Zhang Zhongping, Li Dan, Cai Xianzhen, Zheng Ping, Hu Quanwei, Wang Jian, Wang Suming, Zhou Congyue, Fang Xiaoyao, Cai Xinglin,
Liu Junning, Chen Guo, Fu Zhaohui, Yan Xiuzhang, Chen Dongte, Gao Guofeng, Ma Jianxiong, Li Chao, Cao Jun, Wang Guoliang, Yao Guangqing, Cheng Jianxin, Zhang Shunguo,
Liu Xianglong, Yu Taohua, Xu Xiaoming, Wu Xiuliang, Shen Yuan, Wang Jianshun, Zhu Zhengxiang, Feng Qinyu, Li Wanzhong, Zhang Hongkun, Zhu Mangju, Yu Rongbo,
Gao Xiaofeng, Hou Yinshun, Jin Yucheng, Xu Yongjun, Dai Hongbing, Chang Lunkai, Zheng Zhen, Zhang Zhimin, Xue Ming, Liu Guocheng, Gong Lijun, Xing Donghua, Ren Chengzhi,
Liu Sijie, Feng Yuhua, Zheng Suyan, Tan Sulan, Zhang Huaxu, Zhang Chi, Chen Shunping, Zheng Hai, Ye Chunzhi, Chen Dong, He Hongjun, Wei Jun, Wang Yadong,
Xie Lihua, Yu Xiangyong, Lin Yao, Guo Lei, Zhang Jianxin, Li Haixiang, Yang Jiting, Zheng Xiaoke, Zheng Chunhua, Wang Kuan, Lin Boyang, and Tang Zhongrun.
The previous versions of this document and the documents it replaces are as follows.
---First published in.2014 as GB/T 7251.10-2014;
---This is the first revision.
introduction
GB/T 7251 series standards adopt IEC international standards as equivalent, making my country's low voltage complete switchgear and control equipment standards consistent with the international
to be consistent with international standards to meet the needs of international trade, technical and economic exchanges.
Low voltage equipment sets are an essential component of most power distribution networks. In use, they mainly undertake two major functions.
---Safe control and distribution of electrical energy; and
---Cabinet unit for safe isolation of faulty power grid.
While these two functions place distinct demands on the equipment, the equipment must be able to perform these functions over its expected service life.
The second function, fault management, is to control and distribute electrical energy to the equipment in a properly managed and maintained manner.
Some equipment will never be called upon to handle a fault, but if one does occur, it can respond instantly.
The ASSEMBLY is subject to significant thermal and mechanical stresses. Any aging or degradation of the ASSEMBLY should be limited to ensure that its safety functions are not compromised.
damage.
Due to the nature of the application, if there are defects in the design or application of the complete equipment, they may not be discovered until several years after the complete equipment is installed.
To avoid potential problems and ensure that the equipment is suitable for its application, they will strictly follow the requirements defined in the GB/T 7251 series of standards.
However, since the GB/T 7251 series covers a wide range and some applications may be partially beyond the scope of the standard,
It is equally important to correctly specify the complete set of equipment. When options are provided in the GB/T 7251 series, the option most suitable for the application will be selected; if required
Detailed requirements are beyond the scope of this standard and are to be agreed between the specifier and the manufacturer.
This document indicates the significance of each characteristic to be considered when specifying an ASSEMBLIES and provides the specifier with a means of defining the appropriate
Guidance on complete equipment.
For the purposes of this document, a specifier is the party that specifies or selects the characteristics of an ASSEMBLY. A specifier may be the party that uses and operates the ASSEMBLY.
The purpose of this document is to provide guidance to specifiers on what specifications should be provided to obtain
Complete equipment with the required performance at the optimal cost.
In this document, the term "assembly" refers to a low-voltage switchgear and controlgear assembly. Unless expressly stated otherwise, the term "manufacturer"
Refers to the manufacturer of complete equipment.
The term "line conductor" is used in many places in this document. The previous term was phase conductor.
The focus of this document is on the specifier, that is, the person or organization that provides the specifications for the assembly. The specifier is assumed to be acting on behalf of the user.
The GB/T 7251 series of standards aims to better coordinate all general principles and requirements applicable to complete sets of equipment.
Strive to achieve consistency in the requirements of the complete set of equipment and consistency in the verification of the complete set of equipment, and avoid using other standards for verification.
All these requirements, which can be taken as general, combined with the performance and application specific issues for various types of equipment, have been collected in
In the general provisions of GB/T 7251.1, such as temperature rise, short circuit, and dielectric properties, all types of complete equipment must determine their requirements and corresponding verification methods.
Two main criteria are required.
a) General principles of the basic standard GB/T 7251.1; and
b) Product-specific parts of the GB/T 7251 series, hereinafter referred to as relevant product parts of the GB/T 7251 series.
The GB/T 7251 series of standards covers a wide range of applications for complete sets of equipment, some of which have specific requirements based on their specific applications.
In order to clearly define these specific requirements, relevant product parts of the GB/T 7251 series for specific application types have been (or are being) developed.
Including GB/T 7251.2, GB/T 7251.3, etc. Each GB/T 7251 series related product part about GB/T 7251.1 is
The characteristics and performance required of complete sets of equipment within their specified application range are specified to varying degrees.
This part contains the appendix "Agreement between the manufacturer and user of complete equipment" template to facilitate the specification of complete equipment.
This document considers the general characteristics of all types of equipment. Detailed information applicable to each type of equipment can be found in
It is determined by the specification tables of the relevant product parts of the GB/T 7251 series.
GB/T 7251 is intended to consist of nine parts.
--- Part 1.General. Aims to specify the general requirements of various types of complete equipment standards.
--- Part 2.Complete power switchgear and control equipment. Aims to specify specific requirements and verification of complete power switchgear and control equipment
Method. 1)
1) Part 2 covers the requirements for complete equipment used in photovoltaic installations.
--- Part 3.Distribution boards operated by general personnel (DBO). Aims to specify specific requirements for distribution boards operated by general personnel
and verification methods.
--- Part 4.Particular requirements for complete sets of equipment for construction sites (ACS). Aims to specify the specific requirements for complete sets of equipment for construction sites.
Requirements and verification methods.
--- Part 5.Complete sets of power distribution equipment for public grids. Aims to specify specific requirements and
Verification method.
--- Part 6.Busbar trunking system (bus duct). Aims to specify specific requirements and verification methods for bus ducts.
--- Part 7.Complete equipment for specific applications such as docks, campsites, market squares, electric vehicle charging stations, etc.
Specific requirements and verification methods for complete equipment used.
--- Part 8.General technical requirements for intelligent complete sets of equipment. Aims to specify specific requirements for intelligent complete sets of equipment, such as network connectivity
connection, four remote control functions, etc. and their verification methods.
--- Part 10.Guidelines for specifying complete equipment. Aims to provide application guidance for users of complete equipment.
“General Principles” refer to GB/T 7251.1.
For components used in complete sets of equipment, the "product standard" refers to the relevant part or parts of the national standard (such as circuit breaker reference
GB/T 14048.2).
Low-voltage switchgear and control equipment
Part 10.Guidelines for specifying complete equipment
1 Scope
In low-voltage switchgear and controlgear assemblies IEC 61439 (all parts), the system and application details specified by the specifier are included.
to enable manufacturers to produce complete equipment that meets the needs and expectations of specifiers.
This document points out, from the specifier's perspective, the functions and characteristics that should be defined when specifying a complete set of equipment. This includes.
--- Interpretation of characteristics and options of complete equipment in IEC 61439 (all parts);
---Guidelines on how to select appropriate options and define characteristics to meet specific application needs; and
--- Assist in explaining complete sets of equipment.
The interface characteristics of the complete equipment mentioned in this document and the requirements they comply with are based on the assumption that the complete equipment has been
Divided into design, manufacturing and verification.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
assemblies)
Note. GB/T 7251 (all parts) Low-voltage switchgear and controlgear assemblies [IEC 61439 (all parts)]
semblies-Part 1.General rules)
Note. GB/T 7251.1-2023 Low-voltage switchgear and controlgear assemblies Part 1.General (IEC 61439-1.2020, IDT)
IEC 61439-2.2020 Low-voltage switchgear and controlgear assemblies Part 2.Power switchgear and controlgear assemblies (Low-
Note. GB/T 7251.2-2023 Low-voltage switchgear and controlgear Part 2.Power switchgear and controlgear assemblies (IEC 61439-2.
2020, IDT)
IEC 61439-3 Low-voltage switchgear and controlgear assemblies Part 3.Distribution boards operated by general personnel (DBO) [Low-
Note. GB/T 7251.3-2017 Low-voltage switchgear and controlgear Part 3.Distribution boards operated by general personnel (DBO) (IEC 61439-
3.2012,IDT)
IEC 61439-4 Low-voltage switchgear and controlgear assemblies Part 4.Particular requirements for construction site assemblies (ACS)
Note. GB/T 7251.4-2017 Low-voltage switchgear and controlgear Part 4.Particular requirements for construction site complete sets (ACS)
(IEC 61439-4.2012, IDT)
IEC 61439-5 Low-voltage switchgear and controlgear Part 5.Public grid power distribution equipment (Low-
licnetworks)
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