IEC 62020-2003 pdf – Electrical accessories – Residual current monitors for household and similar uses (RCMs).
1 Scope This International Standard applies to residual current monitors having rated voltages not exceeding 440 V a.c. and rated currents not exceeding 125 A for household and similar purposes. These devices are intended to monitor the residual current of the installation and to give a warning if the residual current between a live part and an exposed conductive part or earth exceeds a predetermined level. RCMs covered by this standard are not intended to be used as protective devices. RCMs detect residual alternating currents and residual pulsating direct currents whether suddenly applied or slowly rising (see 8.16). This standard applies to monitors performing simultaneously the functions of detection of the residual current, of comparison of the value of this current with the residual operating current of the device and of providing the prescribed warning signal(s) when the residual current exceeds this value. RCMs having internal batteries are not covered by this standard. The requirements of this standard apply for normal environmental conditions (see 7.1). Additional requirements may be necessary for RCMs used in locations having severe environmental conditions. This standard does not cover Insulation Monitoring Devices (IMDs) which are covered by the scope of IEC 61557-8. NOTE An RCM is distinguished from an IMD in that it is passive in its monitoring function and only responds to an unbalanced fault current in the installation being monitored. An IMD is active in its monitoring and measuring functions in that it can measure the balanced and unbalanced insulation resistance or impedance in the installation (see IEC 61557-8).
IEC 60050(441):1984, International Electrotechnical Vocabulary (IEV) – Chapter 441: Switchgear, controlgear and fuses IEC 60051(all parts), Direct acting indicating analogue electrical measuring instruments and their accessories IEC 60068-2-28:1990, Environmental testing – Part 2: Tests – Guidance for damp heat tests IEC 60068-2-30:1980, Environmental testing – Part 2: Tests – Test Db and guidance: Damp heat, cyclic (12 + 12-hour cycle) IEC 60364-4-443:1995, 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 IEC 60364-5-53:1994, Electrical installations of buildings – Part 5: Selection and erection of electrical equipment – Chapter 53: Switchgear and controlgear IEC 60417-2:1998, Graphical symbols for use on equipment – Part 2: Symbol originals IEC 60529:1989, Degrees of protection provided by enclosures (IP Code) IEC 60664-1:1992, Insulation coordination for equipment within low-voltage systems – Part 1: Principles, requirements and tests IEC 60664-3:2003, Insulation coordination for equipment within low-voltage systems – Part 3: Use of coating, potting or moulding for protection against pollution IEC 60695-2-1/0:1994, Fire hazard testing – Part 2: Test methods – Section 1/sheet 0: Glow- wire test methods – General IEC 60755:1983, General requirements for residual current operated protective devices IEC 61008-1:1996, Residual current operated circuit-breakers without integral overcurrent protection for household and similar uses (RCCBs) – Part 1: General rules
3 Definitions For the purpose of this standard, the following definitions apply. Where the terms “voltage” or “current” are used, they imply r.m.s. values, unless otherwise specified. 3.1 Definitions relating to currents flowing from live parts to earth 3.1.1 earth fault current current flowing to earth due to an insulation fault 3.1.2 earth leakage current current flowing from the live parts of the installation to earth in the absence of an insulation fault 3.1.3 pulsating direct current current of pulsating wave form (IEV 101-14-31) which assumes, in each period of the rated power frequency, the value 0 or a value not exceeding 0,006 A d.c. during one single interval of time, expressed in angular measure, of at least 150° 3.1.4 current delay angle α α time, expressed in angular measure, by which the starting instant of current conduction is delayed by phase control 3.2 Definitions relating to the energization of an RCM 3.2.1 energizing quantity electrical excitation quantity which alone, or in combination with other such quantities, shall be applied to a RCM to enable it to accomplish its function under specified conditions