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GB 50254-2014: Code for construction and acceptance of low-voltage apparatus -- Electric equipment installation engineering
GB 50254-2014
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50254-2014
Code for Construction and Acceptance
of Low-Voltage Apparatus
Electric Equipment Installation
Engineering
ISSUED ON. MARCH 31, 2014
IMPLEMENTED ON. DECEMBER 1, 2014
Issued by. Ministry of Housing and Urban-Rural Development of the
People's Republic of China;
General Administration of Quality Supervision, Inspection
and Quarantine of the People's Republic of China.
National Standard of the People's Republic of China
Code for Construction and Acceptance of
Low-Voltage Apparatus
Electric Equipment Installation Engineering
Chief Development Department.
China Electricity Council
Approval Department.
Ministry of Housing and Urban-Rural Development of the People's
Republic of China
Implementation Date.
December 1, 2014
China Planning Press
2014 Beijing
Announcement of the Ministry of Housing and Urban-Rural
Development of the People's Republic of China
No. 368
MOHURD Announcement on Publishing the National Standard
"Code for Construction and Acceptance of Low-voltage Apparatus -
Electric Equipment Installation Engineering"
"Code for Construction and Acceptance of Low-voltage Apparatus - Electric Equipment
Installation Engineering” has been approved as a national standard with a serial number of
GB 50254-2014 and shall be implemented on December 1, 2014. Articles 3.0.16 and 9.0.2 in
this code are compulsory and must be enforced strictly. The former "Code for Construction
and Acceptance of Low-voltage Apparatus - Electric Equipment Installation Engineering"
(GB 50254-96) shall be abolished simultaneously.
Organized by the Research Institute of Standards and Norms (RISN) of our Ministry, this
code is published by China Planning Press.
Ministry of Housing and Urban-Rural Development of the People's Republic of China
March 31, 2014
Table of Contents
Foreword ... 5 
2 Terms ... 7 
3 Basic Requirement... 9 
4 Low-Voltage Circuit-Breaker ... 13 
5 Switch, Disconnector, Switch-Disconnector and Fuse-combination Unit ... 15 
6 Residual Current Device and Surge Protective Device ... 16 
7 Contactor, Motor Starter and Frequency Converter ... 17 
8 Control Switch ... 19 
9 Low-voltage Fuse ... 20 
10 Resistor, Rheostat and Electromagnet ... 21 
11 Test ... 23 
12 Check and Acceptance of Work ... 24 
Appendix A Tightening Torques of Screw-type Terminals ... 26 
Appendix B Temperature-rise Limits of Terminals ... 27 
Appendix C Temperature-rise Limits of Accessible Parts ... 28 
Appendix D Temperature-rise Limits of Terminals and Accessible Parts for
Low-voltage Circuit-breakers ... 29 
Explanation of Wording in This Code ... 30 
List of Quoted Standards ... 31 
Foreword
According to the requirements of Document "Notice on Printing 'Development and Revision
Plan of National Engineering Construction Standards and Codes (Batch 1) in 2009'" (Jian
Biao [2009] No. 88) issued by the Ministry of Housing and Urban-Rural Development, the
former "Code for Construction and Acceptance of Low-voltage Apparatus - Electric
Equipment Installation Engineering" (GB 50254-96) was revised jointly by China Electricity
Council, Beijing Construction Engineering Group Co., Ltd and organizations concerned.
The drafting group examined and finalized this code by conducting extensive investigation
and study, summarizing practical experiences during the preparation of this code and on the
basis of extensively soliciting for opinions.
This code consists of 12 chapters and 4 appendixes with the main contents as follows.
General Provisions; Terms; Basic Requirement; Low-Voltage Circuit-Breaker; Switch,
Disconnector, Switch-disconnector and Fuse-combination Unit; Residual Current Device and
Surge Protective Device; Contactor, Motor Starter and Frequency Converter; Control Switch;
Low-voltage Fuse; Resistor, Rheostat and Electromagnetic; Test; Check and Acceptance of
Work, etc.
Compared with the former code, this revision mainly includes the following contents.
1. Two chapters -- "Terms" and "Test" were added.
2. Chapter 4 "Low-voltage Switch-disconnector, Knife Switch, Change-over Switch and
Fuse-combination Unit” of the former code was revised into "Switch, Disconnector,
Switch-disconnector and Fuse-combination Unit".
3. Chapter 5 "Household Electric Apparatus, Leakage Protector and Fire-fighting
Electrical Equipment” of the former code was revised into "Residual Current Device
and Surge Protective Device".
4. Chapter 6 "Low-voltage Contactor and Motor Starter” of the former code was revised
into "Contactor, Motor Starter and Frequency Converter".
5. Chapter 7 "Controller, Relay and Travel Switch” of the former code was revised into
"Control Switch".
6. Chapter 8 "Resistor and Rheostat” and Chapter 9 "Electromagnetic" in the former code
are combined into Chapter 10 of this code "Resistor, Rheostat and Electromagnetic".
7. Appendix A "Tightening Torques of Screw-Type Terminals", Appendix B
"Temperature-Rise Limits of Terminals", Appendix C "Temperature-Rise Limits of
Accessible Parts", Appendix D "Temperature-Rise Limits of Terminals and Accessible
Parts for Low-Voltage Circuit-Breakers" were added.
Provisions printed in bold type in this code are compulsory and must be enforced strictly.
Ministry of Housing and Urban-Rural Development is in charge of the administration of this
code and the explanation of the compulsory provisions, China Electricity Council of routine
management and China Electricity Council of the explanation of specific technical contents.
During the process of implementing this code, the relevant opinions and advice, whenever
necessary, can be posted or passed on to China Electricity Council (address. No.1, 2nd Lane,
Baiguang Road, Xicheng District, Beijing; postal code. 100761) for reference during future
update.
Chief development organizations, participating development organizations, chief drafting
staff and chief examiners of this code.
Chief development organizations.
China Electricity Council
Beijing Construction Engineering Group Co., Ltd.
Participating development organizations.
China Electric Power Research Institute
Guangdong Power Engineering Corporation
Henan No.2 Construction Engineering Co., Ltd.
Gezhouba Group Electricity Co., Ltd.
Shanghai Electrical Apparatus Research Institute (Group) Co., Ltd.
Zhejiang Chint Electrics Co., Ltd.
Changshu Switch Manufacturing Co., Ltd.
Chief drafting staff.
Zhou Weixin, Jing Jin, Yan Yong, Zeng Hongbing, Chai Xuefeng, Liu Shihua, Zhou
Jigang, Xiao Hongwei, Tang Chunchao, Tian Xiao
Chief examiners.
Fu Ciying, Chen Fayu, Wang Zhensheng, Sun Guanfu, Xie Zhenmiao, Liu Wenshan,
Xiao Hong, Wu Yuehua, Liu Yeyu, Zheng Weihong, Wang Yuming
1 General Provisions
1.0.1 This code is prepared with a view to guaranteeing the installation quality of
low-voltage apparatus, to promoting technical progress of construction and installation and to
ensuring the safe operation of installed equipment.
1.0.2 This code is applicable to the installation and acceptance of universal low-voltage
apparatus for AC 50Hz or 60Hz and rated voltage of 1000V or below, and for DC rated
voltage of 1500V or below.
1 Installation and acceptance of the household appliances and electrotechnical
instrumentation of which permanent installation is not required and of complete set of
electrical devices on panel, cabinet and case; ...