SIST EN IEC 63297:2025

SLOVENSKI STANDARD
01-december-2025
Senzorske naprave za sisteme brezkontaktnega spremljanja obremenitve (NILM)
(IEC 63297:2025)
Sensing devices for non-intrusive load monitoring (NILM) systems (IEC 63297:2025)
Abtasteinrichtungen für Systeme zur berührungslosen Lastüberwachung (Non-Intrusive
Load Monitoring - NILM) (IEC 63297:2025)
Dispositifs de détection pour les systèmes de surveillance non intrusive de la charge
(NILM) (IEC 63297:2025)
Ta slovenski standard je istoveten z: EN IEC 63297:2025
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 63297

NORME EUROPÉENNE
EUROPÄISCHE NORM August 2025
ICS 17.220.20
English Version
Sensing devices for non-intrusive load monitoring (NILM)
systems
(IEC 63297:2025)
Dispositifs de détection pour les systèmes de surveillance Abtasteinrichtungen für Systeme zur berührungslosen
non intrusive de la charge (NILM) Lastüberwachung (Non-Intrusive Load Monitoring - NILM)
(IEC 63297:2025) (IEC 63297:2025)
This European Standard was approved by CENELEC on 2025-07-30. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 63297:2025 E
European foreword
The text of document 85/933/CDV, future edition 1 of IEC 63297, prepared by TC 85 "Measuring
equipment for electrical and electromagnetic quantities" was submitted to the IEC-CENELEC parallel
vote and approved by CENELEC as EN IEC 63297:2025.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-08-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-08-31
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 63297:2025 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 61000-4-30:2015 NOTE Approved as EN 61000-4-30:2015 (not modified)
IEC 61557-12:2018 NOTE Approved as EN IEC 61557-12:2022 (not modified)
IEC 61557-12:2018/A1:2021 NOTE Approved as EN IEC 61557-12:2022/A1:2022 (not modified)
IEC 62053-21:2020 NOTE Approved as EN IEC 62053-21:2021 (not modified) +A11:2021
IEC 62053-22:2020 NOTE Approved as EN IEC 62053-22:2021 (not modified) +A11:2021
IEC 62053-23:2020 NOTE Approved as EN IEC 62053-23:2021 (not modified) +A11:2021
IEC 62053-24:2020 NOTE Approved as EN IEC 62053-24:2021 (not modified) +A11:2021
IEC 62054-21:2004 NOTE Approved as EN 62054-21:2004 (not modified)
IEC 62054-21:2004/A1:2017 NOTE Approved as EN 62054-21:2004/A1:2017 (not modified)
IEC 62586-1:2017 NOTE Approved as EN 62586-1:2017 (not modified)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following 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 referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 61010-1 - Safety requirements for electrical EN 61010-1 -
equipment for measurement, control, and
laboratory use - Part 1: General
requirements
IEC 63297 ®
Edition 1.0 2025-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Sensing devices for non-intrusive load monitoring (NILM) systems

Dispositifs de détection pour les systèmes de surveillance non intrusive de la
charge (NILM)
ICS 17.220.20  ISBN 978-2-8327-0500-1

IEC 63297:2025-06(en-fr)
IEC 63297:2025 © IEC 2025
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviated terms . 6
3.1 Terms and definitions . 6
3.2 Abbreviated terms. 8
4 Elements of a NILM system . 8
4.1 General . 8
4.2 NILM sensing device . 9
4.3 NILM analytics . 9
5 Classification of NILM sensing devices (NSD) . 10
5.1 General . 10
5.2 Definition of essential NSD parameter classes . 10
5.2.1 General. 10
5.2.2 Sampling frequency class definition . 10
5.2.3 Output data rate class definition . 11
5.2.4 Data bit rate class definition . 11
6 Documentation requirements . 12
7 Operation of NILM systems . 12
Annex A (informative) Introduction of NILM process . 14
A.1 Example of NILM process . 14
A.2 Data and techniques for NILM . 14
A.3 Examples of NILM sensing devices (NSDs) . 15
Annex B (informative) Data bit rate . 16
Annex C (informative) Measuring equipment compared to NILM sensing devices . 17
C.1 General . 17
C.2 Types of measuring equipment . 17
C.3 Overview of requirements for measuring equipment . 17
C.4 Relationship between NILM sensing devices and measuring equipment . 19
Bibliography . 20

Figure 1 – Principle of non-intrusive load monitoring (NILM) . 5
Figure 2 – Elements of a NILM system . 8
Figure 3 – Component view of a NILM sensing device (NSD) . 10
Figure 4 – Framework for NILM systems operation. 13
Figure A.1 – Example of NILM System implementation . 14
Figure A.2 – Example of NILM sensing device installed in a home panel board . 15
Figure C.1 – Notion of accuracy class . 18

Table 1 – Classification of NSDs according to the sampling frequency . 10
Table 2 – Classification of NSDs according to output data rate . 11
Table 3 – Classification of NSDs according to the data bit rate . 11
Table A.1 – Example of data and techniques used in NILM systems . 14
IEC 63297:2025 © IEC 2025
Table A.2 – Examples of NILM sensing devices and typical specification. 15
Table B.1 – Examples of data bit rate calculation . 16
Table C.1 – Overview of measuring equipment . 17

IEC 63297:2025 © IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Sensing devices for non-intrusive load monitoring (NILM) systems

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
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preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
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Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 63297 has been prepared by IEC technical committee 85: Measuring equipment for
electrical and electromagnetic quantities. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
85/933/CDV 85/953/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.

IEC 63297:2025 © IEC 2025
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IEC 63297:2025 © IEC 2025
INTRODUCTION
Non-intrusive load monitoring (NILM), or non-intrusive appliance and load monitoring (NIALM),
is a process for providing estimated energy usage, for example by type of use (heating, cooling,
etc.) or type of appliance (microwave, etc.) based on load signatures at a single point in the
installation.
NILM systems can be used to survey the specific uses of electrical power in homes, buildings
or industrial areas (see Figure 1).

Figure 1 – Principle of non-intrusive load monitoring (NILM)
At the moment, NILM systems are essentially used in AC distribution networks, but DC networks
are not excluded.
IEC 63297:2025 © IEC 2025
1 Scope
This document provides a classification of NILM sensing devices for use in NILM systems,
according to the state of the art of NILM technologies.
The classification of NILM analytics and NILM systems, as well as performance indicators for
NILM systems, can be considered in the future.
NILM systems produce estimated disaggregation into energy usages. When accurate
measurement and analysis of energy consumption or other electrical parameters, or both, are
necessary (e.g. for monitoring the electrical installation), systems based on standardized
measuring devices (e.g. power metering and monitoring devices (PMDs), power quality
instruments (PQIs) or meters) are used.
NOTE Standardized measuring devices have guaranteed accuracy over a specified range and have limited
deviations in presence of influence quantities (temperature, frequency deviations…) in addition to safety and
constructional requirements. See Annex C for more information.
2 Normative references
The following 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 referenced document (including any
amendments) applies.
IEC 61010-1, Safety requirements for electrical equipment for measurement, control, and
laboratory use – Part 1: General requirements
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1.1
electrical parameter
electrical quantity to be measured or estimated
EXAMPLE RMS value of current, RMS value of voltage, active power, reactive power, harmonics, power quality
related parameters, etc.
3.1.2
estimated value
value of an electrical parameter (e.g. current, power, energy related to a specific usage)
produced by a NILM sensing device or a NILM system
Note 1 to entry: Estimated values are typically less accurate than values measured with standardized measuring
devices (e.g. PMD, PQI, meters).
IEC 63297:2025 © IEC 2025
3.1.3
measured value
value of an electrical parameter (e.g. current, power, energy related to a specific usage)
produced by a measuring device complying with an electrical measurement standard
Note 1 to entry: Examples of measuring devices complying with an electrical measurement standard include PMDs,
PQIs and meters.
3.1.4
load signature
pattern in the data produced by a NILM sensing device that can be attributed to a specific type
of load or energy usage
3.1.5
non-intrusive load monitoring
NILM
process for providing estimated categorization of energy usage based on load signatures
obtained at a single point in the installation
3.1.6
NILM analytics
process for analyzing data produced by a NILM sensing device and providing information about
energy usage
Note 1 to entry: NILM analytics can be performed within the NILM sensing device and/or in the cloud.
3.1.7
NILM sensing device
NSD
device connected to the electrical installation and producing data to be used by NILM analytics
3.1.8
NILM system
combination of a NILM sensing device and NILM analytics
3.1.9
power metering and monitoring device
PMD
combination in one or more devices of several functional modules dedicated to metering and
monitoring electrical parameters in energy distribution systems or electrical installations, used
for applications such as energy efficiency, power monitoring and network performance
Note 1 to entry: Under the generic term “monitoring” are also included functions of recording, alarm management,
etc.
Note 2 to entry: PMDs have a known measurement uncertainty over a specified measurement range and are robust
to influence quantities and industrial environments
[SOURCE: IEC 61557-12:2018, 3.1.1, modified – Note 2 to entry has been modified and Note
3 to entry has been deleted.]
SIST EN IEC 63297:202
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