Electrical accessories - Methodology for determining the energy efficiency class of elect rical accessories(IEC 63172:2020)

This document provides a methodology for determining the energy efficiency class of electrical
accessories, to enable the system designer to determine the most efficient components for an
electrical installation, also considering all functionalities.
NOTE Functionalities are for example: wireless communication, network connectivity, timer, energy monitoring.
This methodology is based on the energy consumption, taking into account the individual
functions of the accessory.
The energy efficiency class approach contributes to the overall reduction of the energy
consumption of an electrical installation.

Verfahren zur Bestimmung der Energieeffizienzklasse für elektrisches Zubehör (IEC 63172:2020)

Petit appareillage - Méthodologie pour déterminer la classe d'efficacité énergétique du petit appareillage (IEC 63172:2020)

L'IEC 63172:2020 fournit une méthodologie permettant de déterminer la classe d'efficacité énergétique du petit appareillage, afin de permettre au concepteur du système de déterminer les composants les plus efficaces pour une installation électrique en prenant également en considération l'ensemble des fonctionnalités.
Cette méthodologie est fondée sur la consommation d'énergie et prend en compte les fonctions individuelles de l'appareil.
L'approche par la classe d'efficacité énergétique contribue à la réduction générale de la consommation d'énergie d'une installation électrique.

Električna oprema - Metodologija za določanje razredov energijske učinkovitosti električne opreme (IEC 63172:2020)

General Information

Status
Published
Public Enquiry End Date
27-Feb-2019
Publication Date
09-Dec-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
28-May-2020
Due Date
02-Aug-2020
Completion Date
10-Dec-2020

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SLOVENSKI STANDARD
SIST EN IEC 63172:2021
01-januar-2021
Električna oprema - Metodologija za določanje razredov energijske učinkovitosti
električne opreme (IEC 63172:2020)
Electrical accessories - Methodology for determining the energy efficiency class of elect
rical accessories(IEC 63172:2020)
Verfahren zur Bestimmung der Energieeffizienzklasse für elektrisches Zubehör (IEC
63172:2020)
Petit appareillage - Méthodologie pour déterminer la classe d'efficacité énergétique du
petit appareillage (IEC 63172:2020)
Ta slovenski standard je istoveten z: EN IEC 63172:2020
ICS:
27.015 Energijska učinkovitost. Energy efficiency. Energy
Ohranjanje energije na conservation in general
splošno
29.020 Elektrotehnika na splošno Electrical engineering in
general
SIST EN IEC 63172:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 63172:2021

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SIST EN IEC 63172:2021


EUROPEAN STANDARD EN IEC 63172

NORME EUROPÉENNE

EUROPÄISCHE NORM
May 2020
ICS 27.015; 29.120.01

English Version
Electrical accessories - Methodology for determining the energy
efficiency class of electrical accessories
(IEC 63172:2020)
Petit appareillage - Méthodologie pour déterminer la classe Verfahren zur Bestimmung der Energieeffizienzklasse für
d'efficacité énergétique du petit appareillage elektrisches Zubehör
(IEC 63172:2020) (IEC 63172:2020)
This European Standard was approved by CENELEC on 2020-04-29. 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,
Turkey 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
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 63172:2020 E

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SIST EN IEC 63172:2021
EN IEC 63172:2020 (E)
European foreword
The text of document 23/830/CDV, future edition 1 of IEC 63172, prepared by IEC/TC 23 "Electrical
accessories" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
EN IEC 63172:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-01-29
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-04-29
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.

Endorsement notice
The text of the International Standard IEC 63172:2020 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60364-8-1 NOTE Harmonized as HD 60364-8-1

2

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SIST EN IEC 63172:2021




IEC 63172

®


Edition 1.0 2020-03




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE
colour

inside










Electrical accessories –

Methodology for determining the energy efficiency class of electrical

accessories




Petit appareillage –

Méthodologie pour déterminer la classe d'efficacité énergétique du petit


appareillage













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 27.015; 29.120.01 ISBN 978-2-8322-8005-8




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN IEC 63172:2021
– 2 – IEC 63172:2020 © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Description of the methodology . 8
4.1 General . 8
4.2 Relationship between accessories, their modes and energy efficiency class
relevance . 8
4.3 Functions embedded in electrical accessories. 9
5 Energy efficiency classes . 12
Annex A (informative) Measuring methods . 15
A.1 Measuring method – General . 15
A.2 Dimmers . 15
A.2.1 Three-wire dimmer (see Figure A.1) . 15
A.2.2 Two-wire dimmer (see Figure A.2) . 15
A.2.3 Three-wire dimmer with mechanical switch load side (see Figure A.3) . 16
A.2.4 Two-wire dimmer with mechanical switch load side (see Figure A.4) . 16
A.3 Presence movement detector . 16
A.3.1 Two-wire presence detector (see Figure A.5) . 16
A.3.2 Three-wire presence detector (see Figure A.6) . 17
A.4 HBES/BACS . 17
A.4.1 HBES/BACS control device (see Figure A.7) . 17
A.4.2 HBES/BACS power supply (see Figure A.8) . 17
A.5 Socket-outlet with further function (see Figure A.9) . 18
A.6 Electronic switch relays . 18
A.6.1 Two-wire electronic switch relay (see Figure A.10) . 18
A.6.2 Three-wire electronic switch relay (see Figure A.11) . 18
Bibliography . 19

Figure 1 – Levels of efficiency . 12
Figure A.1 Three-wire dimmer measuring method . 15
Figure A.2 Two-wire dimmer measuring method . 15
Figure A.3 – Three-wire dimmer with mechanical switch measuring method . 16
Figure A.4 – Two-wire dimmer with mechanical switch load side measuring method . 16
Figure A.6 – Three-wire presence detector measuring method . 17
Figure A.7 – HBES/BACS control device measuring method . 17
Figure A.8 – HBES/BACS power supply measuring method . 17
Figure A.9 – Socket-outlet with further function measuring method . 18
Figure A.10 – Two-wire electronic switch relay measuring method . 18
Figure A.11 – Three-wire electronic switch relay measuring method . 18

Table 1 – Relationship between accessories, their modes and energy efficiency class
(examples) . 9
Table 2 – Examples of functions in electrical accessories . 10

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SIST EN IEC 63172:2021
IEC 63172:2020 © IEC 2020 – 3 –
Table 3 – Energy efficiency classes . 12
Table 4 – Example of each function and the estimated time of usage for a dimmer . 13
Table 5 – Energy efficiency points . 14

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SIST EN IEC 63172:2021
– 4 – IEC 63172:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

ELECTRICAL ACCESSORIES –

Methodology for determining the energy efficiency class of electrical
accessories


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,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
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
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 63172 has been prepared by IEC technical committee 23: Electrical
accessories.
The text of this International Standard is based on the following documents:
CDV Report on voting
23/830/CDV 23/863/RVC

Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

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SIST EN IEC 63172:2021
IEC 63172:2020 © IEC 2020 – 5 –
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.


IMPORTANT – The "colour inside" logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this publication using a colour printer.

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SIST EN IEC 63172:2021
– 6 – IEC 63172:2020 © IEC 2020
INTRODUCTION
The electric energy efficiency of homes and buildings is continuously increasing by reducing
the electric energy consumption of products. For example, changing from traditional
incandescent lighting to LED lighting.
Specific electrical systems and accessories, for example home and building electronic systems
(HBES) / building automation control systems (BACS), individual sensors, actors, actuators,
dimmers and load shedding equipment (LSE), can contribute to additional energy savings.
Additional savings can also be achieved by managing and monitoring electrical energy use,
depending on time, occupancy, inputs and needs from the grid.
HBES/BACS contribute to greater energy savings than the energy they consume to perform this
task. However, as every watt counts, it is necessary to optimize their own energy consumption
for given functionalities.
In the case of devices with more functionality (e.g. multi-channel switch actuators, control boxes,
etc.), this document provides a methodology for determining the energy efficiency class of
accessories based on the consumption of each function and their percentage of use. It aims to
enable the system designer to determine the most efficient system considering the increasing
user demand for additional functionalities.

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SIST EN IEC 63172:2021
IEC 63172:2020 © IEC 2020 – 7 –
ELECTRICAL ACCESSORIES –

Methodology for determining the energy efficiency class of electrical
accessories

1 Scope
This document provides a methodology for det
...

SLOVENSKI STANDARD
oSIST prEN IEC 63172:2019
01-februar-2019
0HWRGRORJLMD]DGRORþDQMHUD]UHGRYHQHUJLMVNHXþLQNRYLWRVWLHOHNWULþQHRSUHPH
Methodology for determining the energy efficiency class of electrical accessories
Ta slovenski standard je istoveten z: prEN IEC 63172:2018
ICS:
27.015 (QHUJLMVNDXþLQNRYLWRVW Energy efficiency. Energy
2KUDQMDQMHHQHUJLMHQD conservation in general
VSORãQR
29.020 Elektrotehnika na splošno Electrical engineering in
general
oSIST prEN IEC 63172:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN IEC 63172:2019

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oSIST prEN IEC 63172:2019
23/830/CDV

COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 63172 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2018-12-21 2019-03-15
SUPERSEDES DOCUMENTS:
23/778/CD,23/790A/CC

IEC TC 23 : ELECTRICAL ACCESSORIES
SECRETARIAT: SECRETARY:
Belgium Mr Wim De Kesel
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:

SC 23A,SC 23B,SC 23E,SC 23G,SC 23H,SC
23J,SC 23K,TC 64,TC 121
Other TC/SCs are requested to indicate their interest, if
any, in this CDV to the secretary.
FUNCTIONS CONCERNED:

EMC ENVIRONMENT QUALITY ASSURANCE 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.

TITLE:
Methodology for determining the energy efficiency class of electrical accessories

PROPOSED STABILITY DATE: 2022

NOTE FROM TC/SC OFFICERS:
This CDV has been prepared by the convenor of WG9 based on the decision of TC 23 WG 9 taken during
it’s meeting held in September 2018


Copyright © 2018 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.

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oSIST prEN IEC 63172:2019
63172/Ed.1/CDV © IEC(E) 2 23/830/CDV

1 CONTENTS
2 FOREWORD . 3
3 INTRODUCTION . 5
4 1 Scope . 6
5 2 Normative references . 6
6 3 Terms and definitions . 6
7 4 Description of the methodology . 7
8 4.1 General . 7
9 4.2 Relationship between accessories, their modes and the energy efficiency class
10 relevance . 8
11 4.3 Functions embedded in electrical accessories . 8
12 5 Energy efficiency classes .11
13 Annex A (informative) Measuring Methods .15
14 A.1 Measuring Method.15
15 A.1.1 General .15
16 A.2 Dimmers .15
17 A.2.1 Dimmer 3 wires .15
18 A.2.2 Dimmer 2 wires .15
19 A.2.3 Dimmer 3 wires with mechanical switch load side .15
20 A.2.4 Dimmer 2 wires with mechanical switch load side .16
21 A.3 Presence Movement detector .16
22 A.3.1 Presence Detector 2 wires .16
23 A.3.2 Presence Detector 3 wires .16
24 A.4 HBES / BACS .16
25 A.4.1 HBES/BACS Device .16
26 A.4.2 HBES Controller .17
27 A.4.3 HBES power supply .17
28 A.5 Socket outlet with further function .17
29 A.6 Electronic switch relays .17
30 A.6.1 Electronic switch relays (2 wires) .17
31 A.6.2 Electronic switch relays 3 wires .18
32 Bibliography .19
33
34 Table 1 – Relationship between accessories, their modes and the energy efficiency class
35 (examples) . 8
36 Table 2 – Examples of functions in electrical accessories .10
37 Table 3 – Energy efficiency classes .12
38 Table 4 – Example of each functions and the estimated time of usage for a dimmer.12
39 Table 5 – Energy Efficiency points .14
40
41

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oSIST prEN IEC 63172:2019
63172/Ed.1/CDV © IEC(E) 3 23/830/CDV

42 INTERNATIONAL ELECTROTECHNICAL COMMISSION
43 ____________
44
45 ELECTRICAL ACCESSORIES –
46
47 Methodology for determining the Energy Efficiency class of electrical
48 accessories
49
50
51 FOREWORD
52 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all
53 national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-
54 operation on all questions concerning standardization in the electrical and electronic fields. To this end and in
55 addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
56 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
57 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
58 may participate in this preparatory work. International, governmental and non-governmental organizations liaising
59 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
60 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
61 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
62 consensus of opinion on the relevant subjects since each technical committee has representation from all
63 interested IEC National Committees.
64 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
65 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
66 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
67 misinterpretation by any end user.
68 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
69 transparently to the maximum extent possible in their national and regional publications. Any divergence between
70 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
71 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
72 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
73 services carried out by independent certification bodies.
74 6) All users should ensure that they have the latest edition of this publication.
75 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
76 members of its technical committees and IEC National Committees for any personal injury, property damage or
77 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses
78 arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
79 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
80 indispensable for the correct application of this publication.
81 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
82 rights. IEC shall not be held responsible for identifying any or all such patent rights.
83 This Technical Report IEC TR XXXXX has been prepared by working group 9: Energy Efficiency
84 Aspects in TC23, of IEC technical committee 23: Electrical accessories.
85 The text of this International Standard is based on the following documents:
FDIS Report on voting
XX/XX/FDIS XX/XX/RVD
86 [JK1]
87 Full information on the voting for the approval of this International Standard can be found in the
88 report on voting indicated in the above table.
89 This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

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oSIST prEN IEC 63172:2019
63172/Ed.1/CDV © IEC(E) 4 23/830/CDV

90 The committee has decided that the contents of this document will remain unchanged until the
91 stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
92 the specific document. At this date, the document will be
93 • reconfirmed,
94 • withdrawn,
95 • replaced by a revised edition, or
96 • amended.
97
98
IMPORTANT – The “colour inside” logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this publication using a colour printer.
99

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oSIST prEN IEC 63172:2019
63172/Ed.1/CDV © IEC(E) 5 23/830/CDV

100 INTRODUCTION
101 The electric energy efficiency of homes and buildings is continuously increasing by reducing the
102 electric energy consumption of products. For example, changing from traditional incandescent
103 lighting to LED lighting.
104 Specific electrical systems and accessories e.g. Home and Building Electronic Systems (HBES) /
105 Building Automation Control Systems (BACS), individual sensors, actors, actuators, dimmers and
106 load shading equipment (LSE) can contribute to additional energy savings.
107 Additional savings can also be achieved by managing and monitoring electrical energy use,
108 depending on time, occupancy, inputs and needs from the grid.
109 HBES/BACS contribute to greater energy savings than the energy they consume to perform this
110 task. However, as every watt counts, it is necessary to optimize their own energy consumption
111 for given functionalities.
112 In the case of devices with more functionality (e.g. multi-channel switch actuators, control
113 boxes,.), this document provides a methodology for determining the energy efficiency class of
114 accessories based on the consumption of each function and their percentage of use. It aims to
115 enable the system designer to determine the most efficient system considering the increasing
116 users request for additional functionalities.
117

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oSIST prEN IEC 63172:2019
63172/Ed.1/CDV © IEC(E) 6 23/830/CDV

118 ELECTRICAL ACCESSORIES –
119
120 Methodology for determining the Energy Efficiency class of electrical
121 accessories
122
123
124
125 1 Scope
126 This document provides a methodology for determining the energy efficiency class of electrical
127 accessories, to enable the system designer to determine the most efficient components for an
128 electrical installation, also considering all functionalities.
129 NOTE Functionalities are for example: wireless communication, network connectivity, timer, energy monitoring.
130 This methodology is based on the energy consumption, taking into account the individual
131 functions of the accessory.
132 The energy efficiency class approach contributes to the overall reduction of the energy
133 consumption of an electrical installation.
134 This group EE publication is primarily intended to be used as an EE standard for the products
135 mentioned in the scope, but is also intended to be used by technical committees in the
136 preparation of publications for products similar to those mentioned in the scope of this document,
137 in accordance with the principles laid down in IEC Guide 118 and IEC Guide 119.
138 2 Normative references
139 The following documents are referred to in the text in such a way that some or all of their content
140 constitutes requirements of this document. For dated references, only the edition cited applies.
141 For undated references, the latest edition of the referenced document (including any
142 amendments) applies.
143 IEC GUIDE 118:2017, Inclusion of energy efficiency aspects in electrotechnical publications
144 IEC GUIDE 119:2017, Preparation of energy efficiency publications and the use of basic energy
145 efficiency publications and group energy efficiency publications
146 3 Terms and definitions
147 For the purposes of this document, the following terms and definitions apply.
148 ISO and IEC maintain terminological databases for use in standardization at the following
149 addresses:
...

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