Detail of GB/T 12113-2003

Introduction of GB/T 12113-2003

1 Scope This standard defines measurement methods for ——D.c. or a.c. of sinusoidal or non-sinusoidal waveform, which could flow through the human body, and ——Current flowing through a protective conductor. The measuring methods recommended for touch current are based upon the possible effects of current flowing through a human body. In this standard, measurements of current through networks representing the impedance of the human body are referred to as measurements of touch current. These networks are not necessarily valid for the bodies of animals. The specification or implication of specific limit values is not within the scope of this standard. IEC 60479-1 provides information regarding the effects of current passing through the human body from which limit values may be derived. This standard is applicable to all classes of equipment, according to IEC 60536. The methods of measurement in this standard are not intended to be used for ——Touch currents having less than 1s duration, ——Patient currents as defined in GB 9706.1, ——A.c. at frequencies below 15 Hz, ——A.c. in combination with d.c. The use of a single network for a composite indication of the effects of combined a.c. and d.c. has not been investigated, ——Currents above those chosen for electric burn limits. This basic safety publication is primarily intended for use by technical committees in the preparation of standards in accordance with the principles laid down in IEC Guide 104 and ISO/IEC Guide 51. It is not intended for use by manufacturers or certification bodies. One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications. The requirements, test methods or test conditions of this basic safety publication will not apply, unless specifically referred to or included in the relevant publications. 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 11918-2001 Plugs, Socket-outlets and Couplers for Industrial Purposes-Part 1: General Requirements (idt IEC 60309-1:1999) GB/T 12501.2 Classification of Electrical and Electronic Equipment with Regard to Protection against Electric Shock-Part 2: Guidelines to Requirements for Protection against Electric Shock (idt IEC 60536-2:1992) GB/T 16895.9-2000 Electrical Installations of Buildings-Part 7: Requirements for Special Installations or Locations-Section 707: Earthing Requirements for the Installation of Data Processing Equipment (idt IEC 60364-7-707:1984) IEC 60050(195): International Electrotechnical Vocabulary (IEV)-Chapter 195: Earthing and Protection against Electric Shock" IEC 60050(604): International Electrotechnical Vocabulary (IEV)-Chapter 604: Generation, Transmission and Distribution of Electricity-Operation IEC 60364-4-41:1992 Electrical Installations of Buildings-Part 4: Protection for Safety-Chapter 41: Protection against Electric Shock IEC 60479-1:1994 Effects of Current on Human Beings and Livestock-Part 1: General Aspects IEC 60536:1976 Classification of Electrical and Electronic Equipment with Regard to Protection against Electric Shock IEC 61140:1997 Protection against Electric shock-Common Aspects for Installation and Equipment ISO/IEC Guide 51:1990: Guideline for the Inclusion of Safety Aspects in Standards IEC Guide 104:1997 Guide to the Drafting of Safety Standards and the Role of Committees with Safety Pilot Functions and Safety Group Functions 3 Definitions For the purpose of this standard, the following definitions apply: 3.1 Touch current Electric current through a human body or through an animal body when it touches one or more accessible parts of an installation or of equipment [see IEV 195-05-21] 3.2 Protective conductor current Current which flows in a protective conductor 3.3 Equipment As defined in the relevant equipment standard. If not defined in the relevant equipment standard, see Annex A 3.4 Grippable part Part of the equipment which could supply current through the human hand to cause muscular contraction round the part and an inability to let go. Parts which are intended to be gripped with the entire hand are assumed to be grippable without further investigation (see Annex H) 3.5 Electric burn Burning of the skin or of an organ, caused by passing an electric current across or through the surface (see IEV 604-04-18)

Contents of GB/T 12113-2003

Foreword I IEC Foreword II Introduction IV 1 Scope 2 Normative References 3 Definitions 4 Test Site 4.1 Test Site Environment 4.2 Test Transformer 4.3 Earthed Neutral Conductor 5 Measuring Equipment 5.1 Selection of Measuring Network 5.1.1 Perception and Reaction (a.c.) 5.1.2 Let-go (a.c.) 5.1.3 Electric Burn (a.c.) 5.1.4 Ripple-free d.c. 5.2 Test Electrodes 5.3 Configuration 5.4 Power connections during test 5.4.1 General 5.4.2 Equipment for Use only on TN or TT Star Power Distribution Systems 5.4.3 Equipment for Use on IT Power Distribution Systems including Unearthed Delta Systems 5.4.4 Equipment for Use on Single-phase Centre-earthed Power Supply Systems or on Centre-earthed Delta Power Supply Systems 5.5 Supply Voltage and Frequency 5.5.1 Supply Voltage 5.5.2 Supply Frequency 6 Test Procedure 6.1 General 6.1.1 Control Switches, Equipment and Supply Conditions 6.1.2 Use of Measuring Networks 6.2 Normal and Fault Conditions of Equipment 6.2.1 Normal Operation of Equipment 6.2.2 Equipment and Supply Fault Conditions 7 Evaluation of Results 7.1 Perception, Reaction and Let-go 7.2 Electric Burn 8 Measurement of Protective Conductor Current 8.1 General 8.2 Multiple Equipment 8.3 Measuring Method Annex A (Normative) Equipment Annex B (Normative) Use of a Conductive Plane Annex C (Normative) Incidentally Connected Parts Annex D (Informative) Choice of Current Limits Annex E (Informative) Networks for Use in Measurement of Touch Current Annex F (Informative) Measuring Network Limitations and Construction Annex G (Informative) Construction and Application of Touch Current Measuring Instruments Annex H (Informative) Grippable Part Annex J (Informative) AC Power Distribution Systems (See 5.4) Annex K (Informative) Routine and Periodic Touch Current Tests, and Tests after Repair or Modification of Mains Operated Equipment Annex L (Normative) Performance and Calibration Annex M (Informative) Bibliography