Detail of GB 13955-2005

Introduction of GB 13955-2005

1 Scope This standard specifies the relevant requirements for correctly selecting, installing and using residual current operated protective devices (hereinafter referred as residual current protective device, RCD for short) and its operation and management. This standard is applicable to power supply and consumption system of power supply neutral-point direct grounding, with AC 50 Hz or 60 Hz operating voltage and rated voltage less than or equal to 230/400 (220/ 380)V. This standard is not applicable to protect phase-phase or phase-N line electric shock accident, electrical equipment damage or electric fire accident. 2 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent modification to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document is applicable to these specifications. GB 6829 General Requirements for Residual Current Operated Protective Devices GB 9706.1 Medical Electrical Equipment—Part 1: General Requirements for Safety (GB 9706.1—1995, idt IEC60601-1:1988) GB 10963 Circuit-breakers for Overcurrent Protection for Household and Similar Installation (GB 10963—1999, idt IEC 60898:1995) GB 14048.2 Low-voltage Switchgear and Controlgear—Low-voltage Circuit Breakers (GB 14048.2—2001, idt IEC 60947-2:1997) GB 14050 Types and Safety Technical Requirements of System Earthing GB 14287 Residual Current Operated Alarm Devices for Fire Prevention GB 16916 (All parts) Residual Current Operated Circuit-breakers without Integral Overcurrent Protection for Household and Similar Uses (RCCB) (GB 16916.1—2003,idt IEC 61008.1:1996;GB 16916.21—1997,idt IEC61008.2-1:1990;GB 16916.22 1997,idt IEC 61008.2-2:1990) GB 16917 (All parts) Residual Current Operated Circuit-breakers with Integral Overcurrent Protection for Household and Similar Uses (RCBO) (GB 16917.1—2003, idt IEC 61009-1:1996; GB 16917.21—1997, idt IEC 61009-2-1:1991; GB 16917.22—1997,idt IEC 61009-2-2: 1991) 3 Terms and Definitions The following terms and definitions are applicable to this standard. 3.1 Direct contact The contact of human body and livestock with live conductor 3.2 Indirect contact The contact of human body and livestock with exposed accessible conductor of live electrical equipment converted under fault conditions. 3.3 Residual current (IΔ) The vector sum (expressed with effective value) of instantaneous value for the major loop current flowing through RCD. 3.4 Residual operating current The residual current value of operating RCD under specified conditions. 3.5 Rated residual operating current

Contents of GB 13955-2005

Foreword Introduction 1 Scope 2 Normative References 3 Terms and Definitions 4 Application of Residual Current Protective Device 5 Selection of Residual Current Protective Device 6 Installation of Residual Current Protective Device 7 Operation and Management of Residual Current Protective Device Annex A (Normative) System Earthing Types Annex B (Normative) Rated Value of Residual Current Protective Device Annex C (Informative) Reference Pattern Figure for Selective Protection Mode