EN IEC 62020-1:2021/prA1:2026

• Status: Not Published
• Publication Date: 21-Feb-2028
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• Technical Committee: CLC/TC 23E - Circuit breakers and similar devices for household and similar applications
• Current Stage: 4020 - Enquiry circulated - Enquiry
• Start Date: 31-Jul-2026
• Due Date: 26-Jun-2026
• Completion Date: 31-Jul-2026
• Directive: Harmonized Standard2014/30/EU - Directive 2014/30/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility (recast)
• Directive:

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  Harmonized Standard2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Mandate: M/511 - Mandate to CEN, CENELEC and ETSI relating to harmonised standards in the field of the Low Voltage Directive
• Mandate: M/552 - [C(2016) 7641 final] Standardisation request as regards harmonised standards in support of Directive 2014/30/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility
• Ref Project: SIST EN IEC 62020-1:2021/oprA1:2026 - Electrical accessories - Residual current monitors (RCMs) - Part 1: RCMs for household and similar uses

• Amends: EN IEC 62020-1:2021 - Electrical accessories - Residual current monitors (RCMs) - Part 1: RCMs for household and similar uses
• Effective Date: 24-Jun-2025

Overview

EN IEC 62020-1:2021/prA1:2026 is an amendment to the international standard for electrical accessories, specifically focusing on Residual Current Monitors (RCMs) for household and similar uses. Developed under the auspices of CLC and IEC Technical Committee 23E, this amendment provides updated requirements and detailed guidance for the verification, selection, and application of RCMs in low-voltage electrical installations. The standard aims to improve electrical safety by enabling continuous monitoring of residual currents, supporting preventive maintenance, and minimizing interruptions to critical power supplies.

Key Topics

• Scope and Objectives: The amendment enhances requirements for on-site verification and complements IEC 60364-6, clarifying that RCMs are for monitoring only, not for direct protection.
• Verification Procedures: Guidance on initial and periodic on-site verification of RCMs, including inspection, functional testing, and the use of equipment compliant with IEC 61557-11.
• Correct Selection and Application:
  • Selecting RCMs according to residual current type (AC, A, F, or B) and monitoring requirements.
  • Ensuring correct installation with respect to environment, pollution degree, and overvoltage category.
• Installation and Wiring: Recommendations for accurate placement, correct wiring, and suitable environmental protection of RCMs.
• Settings and Adjustments: Instructions for verifying and setting residual actuating current and ensuring appropriate warning levels to prevent false alarms.
• Documentation: Requirements for comprehensive reporting following verification, ensuring traceability and compliance.
• Practical Examples: Illustrations of the integration of RCMs alongside RCDs in various critical environments such as data centers, medical facilities, and continuous manufacturing processes.

Applications

Residual Current Monitors (RCMs) are critical for applications where:

• High power availability is essential and unwanted disconnection must be avoided-such as data centers, banks, medical locations, broadcasting stations, airports, and industrial facilities.
• Preventive maintenance is required, by detecting abnormal leakage currents before they result in major faults or false tripping of protective devices.
• Continuous monitoring of leakage currents is needed to anticipate developing insulation faults, thus supporting operational safety and efficiency.
• Integration into IT Systems, where insulation faults must be indicated without immediate disconnection, enhancing system reliability.

By following EN IEC 62020-1:2021/prA1:2026, organizations can ensure that RCMs are properly selected, installed, and maintained, enhancing electrical safety, avoiding unnecessary downtime, and complying with evolving international safety standards.

Related Standards

• IEC 60364-6 – Electrical installations of buildings – Verification
• IEC 61557-11 – Requirements for test equipment used to verify RCM effectiveness
• IEC 60364-5-53 – Selection and erection of electrical equipment – Devices for isolation, switching, and control
• IEC 62020-1 – Base standard for Residual Current Monitors (RCMs)
• IEC 60364-4-41 – Protection for safety – Protection against electric shock

These standards collectively support comprehensive electrical safety management for low-voltage installations, aligning with best practices for verification, inspection, and maintenance of electrical protection devices.

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Keywords: EN IEC 62020-1, residual current monitors, RCM, electrical safety, household use, verification, inspection, preventive maintenance, IEC 61557-11, IEC 60364-6, circuit monitoring, data center electrical safety, CLC standard, low-voltage installations.

SLOVENSKI STANDARD
01-oktober-2026
Električni pribor - Nadzorovanje preostalega (difernečnega) toka (RCM) - 1. Del:
RCM za gospodinjske in podobne namene
Electrical accessories - Residual current monitors (RCMs) - Part 1: RCMs for household
and similar uses
Elektrisches Installationsmaterial - Differenzstrom-Überwachungsgeräte (RCMs) - Teil 1:
RCMs für Hausinstallationen und ähnliche Verwendungen
Petit appareillage électrique - Contrôleurs d'isolement à courant différentiel résiduel
(RCM) - Partie 1: Rcm pour usages domestiques et analogues
Ta slovenski standard je istoveten z: EN IEC 62020-1:2021/prA1:2026
ICS:
29.120.50 Varovalke in druga Fuses and other overcurrent
nadtokovna zaščita protection devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

23E/1424/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 62020-1/AMD1 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2026-07-31 2026-10-23
SUPERSEDES DOCUMENTS:
23E/1402/CD, 23E/1422/CC
IEC SC 23E : CIRCUIT-BREAKERS AND SIMILAR EQUIPMENT FOR HOUSEHOLD USE
SECRETARIAT: SECRETARY:
Italy Mr Sergio Bossi
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 64,TC 85
ASPECTS CONCERNED:
Electromagnetic Compatibility,Safety
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some
Countries” clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the
final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).
TITLE:
Amendment 1 - Electrical accessories - Residual current monitors (RCMs) - Part 1: RCMs for
household and similar uses
PROPOSED STABILITY DATE: 2031
NOTE FROM TC/SC OFFICERS:
download this electronic file, to make a copy and to print out the content for the sole purpose of preparing National
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IEC CDV 62020-1/AMD1 © IEC 2026
1 CONTENTS
3 FOREWORD . 2
4 1 Scope . 4
5 Annex C (informative) Guidance for on-site verification of residual current monitors
6 (RCMs) in electrical installations . 8
7 C.1 Objective . 8
8 C.2 General . 8
9 C.2.1 RCMs in electrical installations . 8
10 C.2.2 Selection of RCMs and residual current transformers . 9
11 C.2.3 Examples of RCMs in electrical installations . 9
12 C.3 Verification of RCMs . 9
13 C.3.1 General . 9
14 C.3.2 Inspection . 10
15 C.3.3 Verification of the effectiveness of RCMs . 12
16 C.4 Documentation . 14
18 Figure C.1 – Example of use of RCDs and RCMs. 15
19 Figure C.2 – Example of RCM used in datacentres for increased availability . 16
21 Table C.1 – Requirements for testing an RCM with test equipment according to IEC
22 61557-11, taking into account RCM product standard IEC 62020-1 . 12
23 Table C.2 – Applicable test waveforms according to RCM types . 13
IEC CDV 62020-1/AMD1 © IEC 2026
28 INTERNATIONAL ELECTROTECHNICAL COMMISSION
29 ____________
31 ELECTRICAL ACCESSORIES –
32 RESIDUAL CURRENT MONITORS (RCM)
34 Part 1: RCMs for household and similar uses
36 AMENDMENT 1
38 FOREWORD
39 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
40 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
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67 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
68 indispensable for the correct application of this publication.
69 9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
70 patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
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73 the latest information, which may be obtained from the patent database available at https://patents.iec.ch [and/or]
74 www.iso.org/patents. IEC shall not be held responsible for identifying any or all such patent rights.
75 Amendment 1 to IEC 62020-1:2020 has been prepared by subcommittee 23E: Circuit-breakers
76 and similar equipment for household use, of IEC technical committee 23: Electrical accessories.
IEC CDV 62020-1/AMD1 © IEC 2026
77 The text of this Amendment is based on the following documents:
Draft Report on voting
XX/XX/XXXX XX/XX/XXX
79 Full information on the voting for its approval can be found in the report on voting indicated in
80 the above table.
81 The language used for the development of this Amendment is English
82 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
83 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
84 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
85 described in greater detail at www.iec.ch/publications/.
86 The committee has decided that the contents of this document will remain unchanged until the
87 stability date indicated on the IEC website under webstore.iec.ch in the data related to the
88 specific document. At this date, the document will be
89 • reconfirmed,
90 • withdrawn, or
91 • revised.
IEC CDV 62020-1/AMD1 © IEC 2026
95 1 Scope
96 To remove NOTE 1 and renumber the following NOTES
IEC CDV 62020-1/AMD1 © IEC 2026
98 To add, after the Annex B, the new Annex C
IEC CDV 62020-1/AMD1 © IEC 2026
IEC CDV 62020-1/AMD1 © IEC 2026
IEC CDV 62020-1/AMD1 © IEC 2026
101 Annex C
102 (informative)
104 Guidance for on-site verification of residual current monitors (RCMs) in
105 electrical installations
106 C.1 Objective
107 This annex intends to provide information for initial and periodic on-site verification of residual
108 current monitors (RCMs) within electrical installations as defined in IEC 60364-6.
109 NOTE : this annex does not intend to address RCM type tests.
110 This annex does not take precedence over IEC 60364-6 but intends to complement it for in-situ
111 RCM verification.
112 This annex provides information when conducting:
113 – inspections of RCMs, e.g. ensuring the correct selection of RCMs, correct settings, and
114 the satisfactory condition for use of RCMs;
115 – in-situ tests of RCMs to ensure they operate correctly without interfering with the
116 protective measures implemented in the electrical installation, either with the RCM test
117 device, or with a test equipment complying with IEC 61557-11;
118 NOTE The requirements and type tests for the test equipment used for testing the effectiveness of RCMs already in
119 use in electrical installations are specified in IEC 61557-11.
120 C.2 General
121 C.2.1 RCMs in electrical installations
122 RCMs are monitoring devices which are suitable in applications where high availability of the
123 power supply is needed and disconnection of distribution circuits is intended to be avoided
124 whenever possible.
125 Note 1 RCMs are not intended to be used nor to replace protective devices in electrical installations.
126 Main reasons for using RCMs are:
127 – the monitoring of possible increases of leakage currents in electrical installations to
128 anticipate the operation of residual current protective devices (RCDs) in the event of
129 excessive leakage current (i.e. fault currents) in the electrical installation according to
130 IEC 60364-5-53;
131 – the integration of RCMs within a preventive maintenance management system with
132 adequate procedures for ensuring continuous monitoring of the electrical installation. In
133 this case periodic verification of the insulation resistance is not necessary (see IEC
134 60364-6)
135 – in IT systems, where the system is designed not to disconnect in the event of first fault,
136 an insulation fault location system (IFLS, coupled with an IMD) or an RCM is used to
137 indicate first fault insulation (see IEC 60364-4-41:2005 + AMD1:2017, clause 411.6.3.1).
138 RCM applications may include for example:
139 – datacentres;
140 – banks, stock exchange;
141 – medical locations;
142 – power generation plants;
IEC CDV 62020-1/AMD1 © IEC 2026
143 – television and radio installation (to identify EMC disturbances);
144 – traffic control (e.g. airports, trains);
145 – continuously running production processes (also those with controlled drives).
146 C.2.2 Selection of RCMs and residual current transformers
147 RCMs are intended to be used within their rated characteristics.
148 RCMs are intended to be used in an environment with pollution degree 2 and overvoltage
149 category III. For an environment with a higher pollution degree, RCMs can be installed in
150 enclosures giving the appropriate degree of protection.
151 Depending on the intended use, RCMs are designed to detect different types of residual
152 currents circulating (e.g. residual alternating current, residual pulsating direct current, residual
153 smooth direct current). Therefore, RCMs are selected according to the type of application and
154 currents. RCMs are classified according to Clause 4. Main differences in RCMs are:
155 – RCMs according to the type of the residual current monitored for electrical installations
156 distributed in AC (see clause 4.13):
157 – Type AC (see clause 5.2.6.1);
158 – Type A (see clause 5.2.6.2);
159 – Type F (see clause 5.2.6.3);
160 – Type B (see clause 5.2.6.4).
161 – RCMs with the ability to directionally discriminate (see clause 4.11);
162 – RCMs with external or internal current transformers (see clause 4.14).
163 C.2.3 Examples of RCMs in electrical installations
164 C.2.3.1 General example of RCM use
165 Figure C.1 provides an example with RCDs in final circuits for additional protection and in the
166 upstream distribution board. RCD types AC, A, F or B can be used depending on the type of
167 electrical installation and the types of loads. RCMs may also be used to increase the availability
168 of the power supply through pre-warning and subsequent preventive maintenance. In general,
169 RCDs and RCMs of the same type, e.g. AC type, are used in a particular circuit.
170 C.2.3.2 Example of use of RCMs in applications with increased availability of power
171 supply
172 Figure C.2 represents an example of installations where increased availability of power supply
173 is needed (e.g. datacenters, control rooms). For such installations, monitoring systems are
174 usually used for permanently monitoring the electrical installation or particular distribution
175 circuits prior to automatic disconnection of the supply.
176 C.3 Verification of RCMs
177 C.3.1 General
178 Initial and periodic verification of electrical installations are conducted following the
179 requirements of IEC 60364-6. Verification of RCMs encompasses
180 – inspections of RCMs, and;
181 – verification of the effectiveness of RCMs.
182 Note 1 According to IEC 60364-6:20XX, 6.5.2, the frequency of periodic verification of an electrical installation is
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