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GB 50254-2014: Code for construction and acceptance of low-voltage apparatus -- Electric equipment installation engineering Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB 50254: Historical versions
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 ContentsForeword... 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... 31ForewordAccording 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 Terms2.0.1 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 Requirement3.0.1 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-Breaker4.0.1 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 Unit5.0.1 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 Device6.0.1 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 Converter7.0.1 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 Switch8.0.1 The installation of cam controller and master controller shall meet the following requirements.9 Low-voltage Fuse9.0.1 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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