International Electrotechnical Commission

Residual current devices with or without overcurrent protection for socket-outlets for household and similar uses - Edition 1.1; Consolidated Reprint
 N 62640

Annotation

This International Standard applies to residual current-operated devices (RCD) incorporated in, or specifically intended for use with two pole socket-outlets, with or without earthing contact for household and similar uses (SRCD: socket-outlet residual current devices). SRCDs, according to this standard, are intended to be used in single phase systems such as phase to neutral or phase to phase or phase to earthed middle conductor.

SRCDs are only intended to provide additional protection downstream of the SRCD. SRCDs are intended for use in circuits where the fault protection (indirect contact protection) is already assured upstream of the SRCD.

NOTE 1 For example, fault protection (indirect contact protection) can be covered as follows:

– in TT systems, by upstream RCBOs or RCCBs according to IEC 61008-1 and IEC 61009-1;

– in a TN system, an overcurrent protective device can be used upstream.

NOTE 2 In the United States, there is no requirement for providing indirect contact protection upstream of an SRCD.

NOTE 3 In Switzerland these devices are not allowed for protective measures according to the national installation rules. SRCDs are neither intended to provide an isolation function nor intended to be used in IT systems.

NOTE 4 For SRCDs intended to provide isolation or fault protection, or to be used in IT systems, IEC 61008-1 or IEC 61009-1 should be used, as applicable, in conjunction with IEC 60884-1.