IEC 61557-11-2020 PDF
Name in English:
St IEC 61557-11-2020
Name in Russian:
Ст IEC 61557-11-2020
Original standard IEC 61557-11-2020 in PDF full version. Additional info + preview on request
Full title and description
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 11: Effectiveness of residual current monitors (RCM) in TT, TN and IT systems. This 2020 edition defines requirements for portable and fixed test equipment used to assess the effectiveness of already-installed residual current monitors across common low-voltage network types.
Abstract
IEC 61557-11:2020 specifies performance, testing and documentation requirements for equipment used to test residual current monitors (RCMs) in TT, TN and IT systems, including directionally discriminating RCMs and Type A/Type B devices. The 2020 edition cancels and replaces IEC 61557-11:2009 and incorporates structural and terminology updates, additional requirements for newer RCM types, and moves Type B requirements into the main body of the document.
General information
- Status: Current / Published
- Publication date: 23 June 2020
- Publisher: International Electrotechnical Commission (IEC)
- ICS / categories: 17.220.20, 29.080.01, 29.240.01
- Edition / version: Edition 2.0 (2020)
- Number of pages: 29
Scope
The standard applies to test equipment used to verify the effectiveness of residual current monitors already installed in low-voltage distribution systems (up to 1 000 V AC / 1 500 V DC). It covers testing in TN, TT and IT networks, and includes requirements for testing directionally discriminating RCMs. IEC 61557-11:2020 is intended for assessment of installed RCMs and not for verification of RCM design or factory product certification against their specific product standards.
Key topics and requirements
- Performance and safety requirements for test equipment used on RCMs.
- Defined test procedures and measurement conditions for simulating residual currents in TN, TT and IT systems.
- Requirements covering Type A and Type B RCM behaviour; Type B requirements are included in the main body of the 2020 edition.
- Specification of test currents, timing, and measurement accuracy needed to assess RCM effectiveness.
- Marking, documentation and reporting requirements for test equipment and test results.
- Alignment of terminology with IEC 60050 and harmonisation with the overall IEC 61557 series structure.
Typical use and users
Used by manufacturers of test equipment, electrical testing and calibration laboratories, utilities, electrical contractors, plant maintenance and safety engineers, and certification/inspection bodies when assessing installed residual current monitoring equipment and when developing or validating RCM test instruments.
Related standards
Part of the IEC 61557 series (general requirements and other parts covering insulation monitoring, earth-fault and residual current devices). Related product or device standards include RCD/RCCB and residual-current device product standards (for example standards covering Type B devices), and terminology standards such as IEC 60050.
Keywords
residual current monitor; RCM; residual current; RCD; low-voltage distribution; TN system; TT system; IT system; test equipment; IEC 61557; Type A; Type B; effectiveness testing.
FAQ
Q: What is this standard?
A: IEC 61557-11:2020 is the IEC standard that sets requirements for equipment used to test the effectiveness of residual current monitors (RCMs) installed in low-voltage distribution systems (up to 1 000 V AC / 1 500 V DC).
Q: What does it cover?
A: It covers performance, test procedures, measurement conditions, accuracy and documentation requirements for test equipment used to simulate residual currents and verify that installed RCMs will operate effectively in TN, TT and IT systems. It is focused on field/test equipment assessment rather than on product certification of the RCM itself.
Q: Who typically uses it?
A: Manufacturers of RCM test instruments, testing and calibration laboratories, utilities, electrical contractors, plant maintenance and safety personnel, and conformity assessment bodies involved in on-site verification and troubleshooting of residual current monitoring systems.
Q: Is it current or superseded?
A: The 2020 edition (Edition 2.0) is the current edition and it cancels and replaces IEC 61557-11:2009 (first edition).
Q: Is it part of a series?
A: Yes — IEC 61557-11 is one part of the IEC 61557 series, which addresses equipment for testing, measuring or monitoring protective measures in low-voltage distribution systems (other parts cover insulation monitoring, earth-fault loop impedance, RCDs, etc.).
Q: What are the key keywords?
A: Residual current monitor (RCM), residual current, RCD, Type A, Type B, low-voltage testing, TN/TT/IT systems, test equipment, IEC 61557.