GB 50254-2014 PDF English
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| GB 50254-2014 | English | 85 |
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Code for construction and acceptance of low-voltage apparatus -- Electric equipment installation engineering
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| GB 50254-1996 | English | RFQ |
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Code for construction and acceptance of cow-voltage apparatus electric equipment installation engineering
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GB 50254-2014: Code for construction and acceptance of low-voltage apparatus -- Electric equipment installation engineering
---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/GB50254-2014
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;
2 Installation and acceptance of the low-voltage apparatus in specific environments.
1.0.3 The construction and acceptance of low-voltage apparatus shall comply with not only
this code but also those in the current relevant standards of the nation.
2 Terms
2.0.1 Low-voltage apparatus
The electrical device in circuit at AC 50Hz or 60Hz and rated voltage of 1000V or below,
and at DC rated voltage of 1500V or below, which functions for on-off, protection, control or
regulation.
2.0.2 Circuit-breaker
A mechanical switching device which can connect, carry and disconnect current under
normal circuit condition as well as in the abnormal circuit specified.
2.0.3 Switch
A mechanical switching device which can connect, carry and disconnect current under
normal circuit condition as well as in the specified abnormal circuit within the stipulated time
limit.
2.0.4 Disconnector
A mechanical switching device which meets the specified functional requirement for
disconnection in disconnected mode.
2.0.5 Switch-disconnector
A switch capable of disconnecting as required by the disconnector in disconnected mode.
Non-manual-operated mechanical switching device with only one stop position, which
can connect, carry and disconnect current under normal circuit condition.
2.0.10 Starter
Electric apparatus in which all the connection and disconnection modes required for
starting and stopping motor as well as an appropriate overload protection are combined.
2.0.11 Soft starter
A special form of AC semiconductor motor controller of which the starting function is
limited to raising of control voltage and (or) current and may include controllable acceleration;
and the additional control function is limited to full voltage operation. It may also serve a
function of motor protection.
2.0.16 Fuse
Electric apparatus of which the circuit it connected and power supply are disconnected
by appropriately blowing out one or several specially-designed components as the current
exceeds the specified value after an enough long period. A fuse includes all the components
that constitute the complete electric apparatus.
2.0.17 Clearance
The shortest linear distance between two conductive components.
2.0.18 Residual current
The vector sum of the instantaneous value of the current flowing through the RCD
primary loop.
2.0.19 Residual operating current
The residual current value which actuates RCD under specified conditions.
3 Basic Requirement
3.0.1 The installation and acceptance of low-voltage apparatus shall comply with the
approved design documents.
3.0.2 The maintenance of low-voltage apparatus shall meet the requirements of technical
documentation of product.
3.0.3 All the low-voltage apparatus and equipment adopted shall have conformity
certification; the equipment covered by "CCC" certification scope shall have the certification
mark and certificate; the equipment shall be provided with nameplate; electrical equipment
that is specifically banned by the nation shall not be adopted.
3.0.6 The execution of constructional engineering relevant to the installation of low-voltage
apparatus shall meet the following requirements.
3.0.7 The inspection of low-voltage apparatus before installation shall meet the following
requirements.
3.0.9 The installation height of low-voltage apparatus shall meet the design requirements; if
it is not specified in design, it shall meet the following requirements.
4 Low-Voltage Circuit-Breaker
4.0.1 The following inspections shall be carried out before the installation of low-voltage
circuit-breaker.
4.0.2 The installation of low-voltage circuit-breaker shall meet the following requirements.
4.0.5 The installation, adjustment and test of DC high-speed circuit-breaker shall
additionally meet the following requirements.
5 Switch, Disconnector, Switch-Disconnector and Fuse-combination Unit
5.0.1 The installation of switch, disconnector and switch-disconnector shall meet the
requirements of technical documentation of product; where no requirements are specified, the
following requirements shall be met.
5.0.2 Installation of DC bus switch-disconnector shall meet the following requirements.
5.0.4 After the completion of fuse-combination unit wiring, the fuse shall be inspected to be
free from damages and the arc chute shall be intact and in reliable fixation; the arc discharge
channel shall be unblocked and each breaking of arc-extinguishing contact shall be consistent.
6 Residual Current Device and Surge Protective Device
6.0.1 The installation of residual current device shall meet the following requirements.
6.0.2 The following inspections shall be carried out before the installation of surge
protective device.
7 Contactor, Motor Starter and Frequency Converter
7.0.1 The inspection of low-voltage contactor and motor starter before installation shall
meet the following requirements.
7.0.2 The following inspections shall be carried out after completing the installation of
low-voltage contactor and motor starter.
7.0.6 The inspection and adjustment of star delta starter shall meet the following
requirements.
7.0.9 The installation of soft starter shall meet the following requirements.
8 Control Switch
8.0.1 The installation of cam controller and master controller shall meet the following
requirements.
9 Low-voltage Fuse
9.0.1 The fuse model and specification shall meet the design requirements.
9.0.2 The fuse must be installed on the phase line in case that three-phase four-wire system
installs fuse; it is prohibited to install fuses on neutral line (N line) and protective earth
neutral line (PEN line).
9.0.5 Where vitrified fuse is installed on the metallic base plate, the base shall be padded
with soft insulating lining.
9.0.6 For fuse with blown fuse indicator, the indicator shall keep in normal state and be
installed on the side convenient for observing.
9.0.7 Where more than two fuses of different specifications are installed, their specifications
shall be marked beside the base.
9.0.8 For fuse with risk of touching live parts, it shall be equipped with insulating gripper.
9.0.9 For fuse with wire code, the power wire shall be connected as per the code.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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