IEC 61557-11-2020 Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC – Equipment for testing, measuring or monitoring of protective measures一 Part 11: Effectiveness of residual current monitors (RCM) in TT, TN and IT systems.
2 Normative references
The fllowving documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the relerenced document (including any amendments) applies.
IEC 61010-1:2010, Safety requrements for electrical equipment for measurement, control, and laboratory use – Part 1: General requirements
IEC 61557-1:2019, Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC – Equipment for testing, measuring or monitoring of protective measures – Part 1: General requlrements
IEC 61557-6，Electrical safety in 1ow voltage distribution systems up to 1 000 VAC and 1 500 V DC – Equpment tor testing. measuring or monitoring of protective measures – Part 6: Effectiveness of residual current devices (RCD) in TT, TN and IT systems
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61557-1, IEC 61557- 6. and the ollowing apply.
IS0 and 1EC maintain terminological databases for use in standardization at the fllowving addresses:
●IEC Electropedia: avalable at htp://www.electropedia.org/
●ISO Online browsing plaform: available at htpt//ww.iso .org/obp
3.1 earth fault current
current flowing to earth due to an insulation fault
[SOURCE: IEC 60050-442:1998. 442-01-23]
3.2 test current
1 current superimposed by the test equipment for testing the ffectiveness of the RCM
3.3 residual current
RMS value of the vector sum of the currents flowing through the main circuit of the residual current device due to an insulation fault
[SOURCE: IEC 60050-442:2019. 442-05-19. modifed – The wording “instantaneous values” has been deleted from the definition and “due to an insulation fault” has been added.]
3. rated residual operating current’sn value of rosidual operating current assigned to the RCM by the manufacturer at which the RCM
operates under specified conditions residual operating current value of residual current which causes the residual current monitoring device to operate under specitied conditions
[SOURCE: IEC 60050-442:2019. 442-05-20. modified: residual current device” has been replaced with “residual current monitoring device” and symbol “on”has been replaced with residual non-operating current
value of residual current at and below which the RCM does not operate under specified conditions.IEC 61557-11 pdf download.