IEC 60755:2017 pdf download

IEC 60755:2017 pdf download.General safety requirements for residual current operated protective devices
1 Scope
This document provides general minimum requirements, recommendations and information for the drafting of standards on residual current operated protective devices (hereinafter referred to as residual current devices, “RCDs”). It applies to any device providing residual current protection intended primarily for protection against electric shock hazard. NOTE 1 Residual current monitors (RCMs) according to IEC 62020, whose purpose is to monitor an electrical installation and not to provide protection, are not covered by this document and cannot be considered similar or equivalent to RCDs. NOTE 2 RCDs for DC supply system are under consideration. NOTE 3 For the relationship between this document and the RCD product standards, see Annex D. This document is primarily intended to be used as a reference for drafting product safety standard for devices identified as “RCD” or “residual current device” either for general use or incorporated or embedded in equipment. This document is also intended to be used as a reference for defining the design requirements and the applicable testing procedure for an RCD incorporated or embedded in an equipment. 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 1 04 and lSO/lEC 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.
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62873-2 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp 3.1 supplementary protection measure to further reduce the risk of electric shock without replacing fault and/or additional protection according to IEC 60364-4-41
4 Classification
4.1 According to the method of operation
Classification is given in the relevant product standard.
4.2 According to the type of installation
4.2.1 RCD for fixed installation and fixed wiring
NOTE RCDs according to this classification are designed to be used to provide protection against electric shock according to IEC 60364-4-41 .
4.2.2 Portable RCDs with corded connection
NOTE RCDs according to this classification are designed to be used to provide supplementary protection only.
4.3 According to the possibility of adjusting the residual operating current
4.3.1 RCD with a single value of rated residual operating current
4.3.2 RCD with multiple settings of residual operating current by fixed steps
4.3.3 RCD whose rated residual operating current is continuously adjustable
4.4 According to their operating characteristics and behaviour in presence of DC
components
4.4.1 RCD of type AC
4.4.2 RCD of type A
4.4.3 RCD of Type F
4.4.4 RCD of Type B
4.5 According to time-delay (in presence of a residual current)
4.5.1 RCD without time-delay
4.5.2 RCD with time-delay
4.5.2.1 RCD of type S with time-delay of 0,06 s;
4.5.2.2 RCD with other time-delay.
4.6 According to the protection against external influences
4.6.1 Enclosed-type RCD (not requiring an appropriate enclosure)
4.6.2 Unenclosed-type RCD (for use with an appropriate enclosure)
4.7 According to the method of mounting
4.7.1 Surface-type RCD
4.7.2 Flush-type RCD