National Standard. of the People s Republic of China

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1 Translated English of Chinese Standard: GB ICS ; L 09 National Standard GB of the People s Republic of China GB / IEC :2001 Replacing GB Safety requirements for electrical equipment for measurement, control, and laboratory use - Part 1: General requirements (IEC :2001, IDT) 测量控制和实验室用电气设备的安全要求第 1 部分 : 通用要求 Issued on: June 7, 2007 Implemented on: September 1, 2007 Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration Committee. Page 1 of 136

2 Table of Contents Foreword... 9 Introduction Scope and object Scope Equipment included in scope Equipment excluded from scope Computing equipment Object Aspects included in scope Aspects excluded from scope Verification Environmental conditions Normal environmental conditions Extended environmental conditions Normative references Terms and definitions Equipment and states of equipment Parts and accessories Electrical quantities Tests Safety terms Insulation Tests General Sequence of tests Reference test conditions Environmental conditions Page 2 of 136

3 4.3.2 State of equipment Testing in SINGLE FAULT CONDITION General Application of fault conditions Duration of tests Conformity after application of fault conditions Marking and documentation Marking General Identification MAINS supply Fuses TERMINALS, connections and operating devices Switches and circuit-breakers Equipment protected by DOUBLE INSULATION or REINFORCED INSULATION Field-wiring TERMINAL boxes Warning markings Durability of markings Documentation General Equipment RATINGS Equipment installation Equipment operation Equipment maintenance Protection against electric shock General Requirements Exceptions Page 3 of 136

4 6.2 Determination of ACCESSIBLE parts Examination Openings above parts that are HAZARDOUS LIVE Openings for pre-set controls Permissible limits for ACCESSIBLE parts Values in NORMAL CONDITION Values in SINGLE FAULT CONDITION Protection in NORMAL CONDITION Protection in SINGLE FAULT CONDITION PROTECTIVE BONDING DOUBLEIN SULATION and REINFORCED INSULATION PROTECTIVE IMPEDANCE Automatic disconnection of the supply Connections to external circuits General TERMINALS for external circuits Circuits with TERMINALS which are HAZARDOUS LIVE ACCESSIBLE TERMINALS for stranded conductors CLEARANCES and CREEPAGE DISTANCES General requirements MAINS CIRCUITS Circuits other than MAINS CIRCUITS Measuring circuits Procedure for dielectric strength tests Reference test earth Humidity preconditioning Conduct of tests Voltage tests Page 4 of 136

5 6.9 Constructional requirements for protection against electric shock General ENCLOSURES of equipment with DOUBLE INSULATION of REINFORCED INSULATION Over-range indication Connection to MAINS supply source and connections between parts of equipment MAINS supply cords Fitting of non-detachable MAINS supply cords Plugs and connectors Disconnection from supply source General Requirements according to type of equipment Disconnecting devices Protection against mechanical HAZARDS General Moving parts Stability Provisions for lifting and carrying Mechanical resistance to shock and impact ENCLOSURE rigidity test Static test Dynamic test Drop test Equipment other than HAND-HELD EQUIPMENT and direct plug-in equipment HAND-HELDEQ UIPMENT and direct plug-in equipment Protection against the spread of fire Eliminating or reducing the sources of ignition within the equipment Containment of fire within the equipment, should it occur Page 5 of 136

6 9.2.1 Constructional requirements Limited-energy circuit Requirements for equipment containing or using flammable liquids Overcurrent protection PERMANENTLY CONNECTED EQUIPMENT Other equipment Equipment temperature limits and resistance to heat Surface temperature limits for protection against burns Temperatures of windings Other temperature measurements Conduct of temperature tests Temperature measurement of heating equipment Equipment intended for installation in a cabinet or a wall Resistance to heat Integrity of CLEARANCES and CREEPAGE DISTANCES Non-metallic ENCLOSURES Insulating material Protection against HAZARDS from fluids General Cleaning Spillage Overflow Battery electrolyte Specially protected equipment Fluid pressure and leakage Maximum pressure Leakage and rupture at high pressure Leakage from low-pressure parts Page 6 of 136

7 Overpressure safety device Protection against radiation, including laser sources, and against sonic and ultrasonic pressure General Equipment producing ionizing radiation Ionizing radiation Accelerated electrons Ultraviolet (UV) radiation Microwave radiation Sonic and ultrasonic pressure Sound level Ultrasonic pressure Protection against liberated gases, explosion and implosion Poisonous and injurious gases Explosion and implosion Components Batteries and battery charging Implosion of cathode ray tubes Equipment RATED for high pressures Components General Motors Motor temperatures Series excitation motors Over temperature protection devices Fuse holders MAINS voltage selecting devices HIGH INTEGRITY Components Page 7 of 136

8 14.7 MAINS transformers tested outside equipment Printed circuit boards Circuits or components used as transient overvoltage limiting devices Protection by interlocks General Prevention of reactivating Reliability Test and measurement equipment Current measuring circuits Multifunction meters and similar equipment Annex A Annex B Annex C Annex D Annex E Annex F Annex G Bibliography Page 8 of 136

9 Foreword All technical content of this part of GB 4793 is mandatory. GB 4793 is currently divided into 7 parts: - Part 1: Safety requirements for electrical equipment for measurement, control, and laboratory use. Part 1:General requirements (IEC ); - Part 2: Safety requirements for electrical equipment for measurement, control, and laboratory use. Part 2:Particular requirements for hand-held and hand-manipulated current sensors for electrical test and measurement (IEC ); - Part 3: Safety requirements for electrical equipment for measurement, control, and laboratory use. Part3:Particular requirements for laboratory equipment for mixing and stirring (IEC ); - Part 4: Safety requirements for electrical equipment for measurement, control and laboratory use Part 4: Particular requirements for autoclaves using steam for the treatment of medical materials and for laboratory process (IEC ); - Part 5: Safety requirements for electrical equipment for measurement, control, and laboratory use. Part 5: Safety requirements for hand-held probe assemblies for electrical measurement and test (IEC ); - Part 6: Safety requirements for electrical equipment for measurement, control and laboratory use - Part 6: the special requirements of laboratory equipment for the heating of materials (IEC ); - Part 7: Safety requirements for electrical equipment for measurement, control, and laboratory use. Part 7:Particular requirements for laboratory centrifuges (IEC ). Note: Above name of the parts will be changed with change of IEC standard name. This Part is Part 1 of GB [Note by Translator: The following text in red indicates the key differences between GB and IEC :2001] This part equivalently adopts IEC :2001 Safety requirements for electrical equipment for measurement, control, and laboratory use - Part 1: General Page 9 of 136

10 requirements (English). The technical content and structure are exactly the same as IEC And it incorporates the contents of technical corrigendum 1 and 2 (on the right side with a double vertical bars). This part is the revision of GB Safety requirements for electrical equipment for measurement, control, and laboratory use - Part 1: General requirements (idt IEC :1990). Compared between version-2007 and version-1995 of this Part, there are major changes: The text of many provisions in the standard has been modified; the standard structure has been further adjusted; for some test methods, there is more detail description. For example, on the basis of normal environmental conditions, it adds the extended environmental conditions; in anti-shock section, it redefines safe voltage limit, and it amends damp places limits; in fire protection requirements, it newly introduces concept of energy-limited circuits, and it gives the judgment data; corresponding to the anti-liquid danger, this Part newly adds liquid pressure test procedure. For ease of use, this Part makes the following editorial changes: [Note by Translator: The following text in red indicates the key differences between GB and IEC :2001] a) USE decimal point "." to replace the comma as a decimal point ",". b) DELETE the content of Preface and "Annex H (informative) definition index" of IEC :2001. c) For those international standards cited by IEC :2001, if there are equivalently-adopted or modified national standards, this Part uses the national standards or industry standards to replace the corresponding international standards. If there is no corresponding equivalently-adopted or modified national standards, they are directly cited in this Part (see Chapter 2 of this Part). d) The errors in original edition are corrected. From the date of implementation, this Part shall replace GB GB shall be abolished on the same day. Appendix A, Appendix B, Appendix C, Appendix D, Appendix E, and Appendix F of this Part are normative. Appendix G is informative. This Part was proposed by Ministry of Industry and Information Technology of the People's Republic of China. This Part shall be under the jurisdiction of the China Electronics Standardization Institute (CESI). Page 10 of 136

11 Drafting organization of this Part: China Electronics Standardization Institute (CESI). Main drafters of this Part: Jia Zhen, Guo Jianyu, and Xiao Xiangrong. First-time publication of GB was on December 29, Page 11 of 136

12 Introduction This Part of GB 4793 specifies the general safety requirements for all applicable equipment within its scope of application. For specific type of equipment, these general applicable safety requirements shall use 1 or more special requirements from other parts of GB 4793 to supplement or modify. Special requirements of other parts of GB 4793 must be read together with the general requirements of this Part. Page 12 of 136

GB/T / IEC :2007

GB/T / IEC :2007 Translated English of Chinese Standard: GB/T16935.1-2008 www.chinesestandard.net Sales@ChineseStandard.net GB NATIONAL STANDARD OF THE PEOPLE S REPUBLIC OF CHINA ICS 29.120 K 30 GB/T 16935.1-2008 / IEC