Detail of GB/T 17045-2008

Introduction of GB/T 17045-2008

1 Scope This standard applies to the protection of persons and animals against electric shock. It is intended to give fundamental principles and requirements which are common to electrical installations, systems and equipment or necessary for their co-ordination. This standard has been prepared for installations, systems and equipment without a voltage limit. Note: there are some clauses in this standard which refer to low-voltage and high-voltage systems, installations and equipment. For the purpose of this standard, low -voltage is any rated voltage up to and including 1 000 V a.c. or 1 500 V d.c. High voltage is any rated voltage exceeding 1 000 V a.c. or 1 500 V d.c The requirements of this standard apply only if they are incorporated, or are referred to, in the relevant standards. It is not intended to be used as a stand-alone standard. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. GB/T 156-2007 Standard voltage (IEC 60038: 2002, MOD) GB 1985-2004 High-voltage alternating-current disconnectors and earthing switches (IEC 62271-102: 2002, MOD) GB/T 3805-1993 Extra-low voltage （ELV）-Limit values (eqv IEC 61201: 1992) GB 4208-1993 Degrees of protection provided by enclosure (IP code) (eqv IEC 60529:1989) GB/T 5465.2 Graphical symbols for use on electrical equipment (GB/T 5465.2-1996，idt IEC 60417-2) GB 9706.1-1995 Medical electrical equipment-Part 1: General requirements for safety (idt IEC 60601-1: 1988) GB 9706 Medical electrical equipment (all parts) (idt IEC 60601 (all parts)) GB 16895.12-2001 Electrical installations of buildings--Part 4: Protection for safety--Chapter 44: Protection against overvoltages--Section 443: Protection against overvoltages of atmospheric origin or due to switching (idt IEC 60364-4-443: 1995) GB 16895.21-2004 Electrical installations of buildings—Part 4-41: Protection for safety—Protection against electric shock (IEC 60364-4-41: 2001, IDT) GB 16895.23-2005 Electrical installations of buildings—Part 6-61: Verification—initial verification (IEC 60364-6-61: 2001, IDT) GB 16935.1-1997 Insulation coordination for equipment within low-voltage systems Part 1: Principles, requirements and tests (idt IEC 60664-1: 1992) IEC 60050(131) International Electrotechnical Vocabulary (IEV) – Chapter 131: Electric and magnetic circuits IEC 60050(195):1998 International Electrotechnical Vocabulary (IEV) – Part 195: Earthing and protection against electric shock Amendment 1 (2001) IEC 60050(351):1998 International Electrotechnical Vocabulary – Part 351: Automatic control IEC 60050(826):1982 International Electrotechnical Vocabulary – Chapter 826: Electrical installations of buildings Amendment 2 (1 995) IEC 60071-1:1993 Insulation co-ordination – Part 1: Definitions, principles and rules IEC 60071-2:1996 Insulation co-ordination – Part 2: Application guide IEC 60446:1999 Basic and safety principles for man-machine interface, marking and identification – Identification of conductors by colours or numerals IEC 60479-1:1994 Effects of current on human beings and livestock – Part 1: General aspects IEC 60721 (all parts) Medical electrical equipment IEC 60990:1999 Methods of measurement of touch current and protective conductor current ISO/IEC Guide 51:1999 Safety aspects — Guidelines for their inclusion in standards IEC Guide 1 04:1997 The preparation of safety publications and the use of basic safety publications and group safety publications 3 Definitions For the purpose of this Standard the following definitions apply: 3.1 electric shock physiological effect resulting from an electric current through a human or animal body [IEV 195-01-04] 3.1.1 basic protection protection against electric shock under fault-free conditions

Contents of GB/T 17045-2008

Foreword I 1 Scope 2 Normative references 3 Definitions 4 Fundamental rule of protection against electric shock 4.1 Normal conditions 4.2 Single-fault conditions 4.3 Special cases 5 Protective provisions (elements of protective measures) 5.1 Provisions for basic protection 5.2 Provisions for fault protection 5.3 Enhanced protective provisions 6 Protective measures 6.1 Protection by automatic disconnection of supply 6.2 Protection by double or reinforced insulation 6.3 Protection by equipotential bonding 6.4 Protection by electrical separation 6.5 Protection by non-conducting environment (low-voltage) 6.6 Protection by SELV 6.7 Protection by PELV 6.8 Protection by limitation of steady-state touch current and charge 6.9 Protection by other measures 7 Co-ordination of electrical equipment and of protective provisions within an electrical installation 7.1 Class 0 equipment) 7.2 Class I equipment 7.3 Class II equipment 7.4 Class III equipment 7.5 Touch currents, protective conductor currents, leakage currents 7.6 Safety and boundary clearances and warning labels for high-voltage installations 8 Special operating and servicing conditions 8.1 Devices to be operated manually and components intended to be replaced manually 8.2 Electrical values after isolation 8.3 Isolation device Annex A (informative) Survey of protective measures as implemented by protective provisions Annex B (informative) Values of maximum a.c. limits of protective conductor currents for cases 7.5.2.2 a) and 7.5.2.2 b)