GB 7251.12-2013[GB/T 7251.12-2013] Low-voltage switchgear and controlgear assemblies -- Part 2: Power switchgear and controlgear assemblies (English PDF)

Foreword

All technical content of this part is mandatory.

GB 7251 Low-voltage switchgear and controlgear assemblies is divided into the

following parts:

-- Part 0: Requirements manual for low-voltage switchgear and controlgear

assemblies

-- Part 1: General rules

-- Part 2: Power switchgear and controlgear assemblies

-- Part 3: Distribution boards intended to be operated by ordinary persons (DBO)1)

-- Part 4: Particular requirements for assemblies for construction sites (ACS)2)

-- Part 5: Assemblies for power distribution in public networks

-- Part 6: Busbar trunking systems (busways)

-- Part 7: Assemblies for specific applications such as marinas, camping sites,

market squares, electric vehicle charging stations

......

This part is Part 2 of GB 7251.

This part was drafted in accordance with the rules given in GB/T 1.1-2009.

This part was translated and is identical to IEC 61439-2:2011 Low-voltage switchgear

and controlgear assemblies - Part 2: Power switchgear and controlgear assemblies.

The Chinese documents that have consistent correspondence with the international

documents normatively cited in this part are as follows:

-- GB/T 17045-2008 Protection against electric shock - Common aspects for

installation and equipment (IEC 61140:2001, IDT)

The following editorial changes have been made to this part:

-- "This standard" is changed to "this part";

-- The decimal point symbol "." is used instead of the symbol ",";

1) This part is applying for project approval.

2) This part is applying for project approval.

-- The preface of the international standard is deleted.

This part was proposed by China Electrical Equipment Industry Association.

This part shall be under the jurisdiction of the National Technical Committee on Low-

voltage Switchgear and Controlgear Assemblies of Standardization Administration of

China (SAC/TC266).

Drafting organizations of this part: Tianjin Research Institute of Electrical Science Co.,

Ltd. (National Electric Power Distribution Equipment Quality Supervision and

Inspection Center), Chengdu Product Quality Supervision and Inspection Institute,

Tianjin Tianchuan Electric Control Distribution Co., Ltd., Changshu Switch

Manufacturing Co., Ltd. (formerly Changshu Switchgear Plant), China Quality

Certification Center, Chuan Kai Electric Co., Ltd., Transmission and Distribution

Branch of Shanghai Electric Group Co., Ltd., Chengdu Tongli Stock Group Co., Ltd.,

Foretech Elec.App. (Jiangsu) Co., Ltd., Daqo Group Co., Ltd., Jiangsu BRLT Electric

Co., Ltd., Guangdong Zhujiang Switchgear Co., Ltd., Shanghai Najie Complete Sets of

Electrical Equipment Co., Ltd., Suzhou Electrical Apparatus Science Academy Co.,

Ltd., Gansu Electric Appliance Research Institute Co., Ltd. (formerly Gansu Electric

Appliance Science Institute), Guangzhou Baiyun Electric Equipment Co., Ltd., Anhui

Xinlong Electric Appliance Co., Ltd., Chengdu Kexing Electric & Electronic Co., Ltd.,

Zhucheng Kexin Power Engineering Co., Ltd., Juche ( Zhejiang) Science-technology

Co., Ltd., Xiamen Minghan Electric Co., Ltd., Guangzhou Southern Power Group

Electric Apparatus Co., Ltd., Chongqing Shineng Power Equipment Co., Ltd., Jiangsu

Modern Electric Technology Co., Ltd., Hangzhou Zhijiang Switchgear Stock Co., Ltd.,

Ningbo Tianan (Group) Co., Ltd., Zhejiang Yaoming Power Equipment Co., Ltd.,

Tianjin Tianchuan Yingke Technology Development Co., Ltd., Shanghai Upun Electric

(Group) Co., Ltd., Wenzhou Zhongyi Lockset Electric Co., Ltd., Huapeng Group Co.,

Ltd., Shenzhen Qihui Electric Co., Ltd., Yuyao Electric Power Equipment Repair and

Manufacturing Factory, China Coal Electric Co., Ltd., Zhenjiang klockner Moeller

Electrical Systems Co., Ltd.

Main drafters of this part: Zhong Mingzhen, Wang Yang, Liu Jie, Ma Yijun, Cui Jing,

Hu Jiangang, Chen Xin, Zhang Qing, Xia Jinhui, Miao Yong, Zhou Jicong, Jin Minyi,

Pei Jun, Zhu Wentang, Zhang Baicheng, Wang Xiuzheng, Hu Delin, Li Ping, Wang Yi,

Wan Yuchao, Zhang Daxuan, Yan Zhengjun, Liu Xiaolin, Han Ren, He Yong, Li

Yanping, Shi Boyi, Ma Xuefeng, Sheng Xiaoyan, Ma Chao, Hou Liang, Zhao Jianyu,

Pan Zhengdong, Chen Yunhua, Sun Licheng, Zou Qihong, Wang Yazhi, Guo Qiaogen.

Low-voltage switchgear and controlgear assemblies - Part 2:

Power switchgear and controlgear assemblies

1 Scope

This part of GB 7251 defines the specific requirements of power switchgear and

controlgear assemblies (PSC-ASSEMBLIES) as follows:

-- ASSEMBLIES for which the rated voltage does not exceed 1000 V in case of

a.c. or 1000 V in case of d.c.;

-- Stationary or movable ASSEMBLIES with or without enclosure;

-- ASSEMBLIES intended for use in connection with the generation, transmission,

distribution and conversion of electric energy, and for the control of electric

energy consuming equipment;

-- ASSEMBLIES designed for use under special service conditions, for example in

ships and in rail vehicles provided that the other relevant specific requirements

are complied with;

-- ASSEMBLIES designed for electrical equipment of machines. Supplementary

requirements for ASSEMBLIES forming part of a machine are covered by the

IEC 60204 series.

This standard applies to all ASSEMBLIES whether they are designed, manufactured

and verified on a one-off basis or fully standardized and manufactured in quantity.

The manufacture and/or assembly may be carried out other than by the original

manufacturer (see 3.10.1).

This standard does not apply to individual devices and self-contained components, such

as motor starters, fuse switches, electronic equipment, etc. which will comply with the

relevant product standards. This standard does not apply to the specific types of

ASSEMBLIES covered by other parts of GB 7251. For ASSEMBLIES not covered by

other parts, this part applies.

NOTE 1: Throughout this part, the abbreviation PSC-ASSEMBLY (see 3.1.101) is used for a power

switchgear and controlgear ASSEMBLY.

NOTE 2: Supplementary requirements for ASSEMBLIES in ships are covered by IEC 60092-302.

be complied with in the different positions as well as during transfer from one position

to another.

Additional subclauses: