prEN IEC 80000-17:2026

SLOVENSKI STANDARD
01-september-2026
Veličine in enote - 17. del: Časovna odvisnost
Quantities and units - Part 17: Time dependency
Grandeurs et unités - Partie 17: Dépendance temporelle
Ta slovenski standard je istoveten z: prEN IEC 80000-17:2026
ICS:
01.060 Veličine in enote Quantities and units
17.080 Merjenje časa, hitrosti, Measurement of time,
pospeška, kotne hitrosti velocity, acceleration,
angular velocity
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

25/853/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 80000-17 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2026-07-17 2026-10-09
SUPERSEDES DOCUMENTS:
25/844/RR
IEC TC 25 : QUANTITIES AND UNITS
SECRETARIAT: SECRETARY:
Italy Ms Daniela Zambelli
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 1,TC 2,TC 3,SC 3C,SC 3D,TC 4,TC 5,TC 7,TC 8,SC
8A,SC 8B,SC 8C,TC 9,TC 10,TC 11,TC 13,TC 14,TC
15,TC 17,SC 17A,SC 17C,TC 18,SC 18A,TC 20,TC 21,SC
21A,TC 22,SC 22E,SC 22F,SC 22G,SC 22H,TC 23,SC
23A,SC 23B,SC 23E,SC 23G,SC 23H,SC 23J,SC 23K,TC
26,TC 27,TC 29,TC 31,SC 31G,SC 31J,SC 31M,TC 32,SC
32A,SC 32B,SC 32C,TC 33,TC 34,SC 34A,SC 34B,SC
34C,SC 34D,TC 35,TC 36,SC 36A,TC 37,SC 37A,SC
37B,TC 38,TC 40,TC 42,TC 44,TC 45,SC 45A,SC 45B,TC
46,SC 46A,SC 46C,SC 46F,TC 47,SC 47A,SC 47D,SC
47E,SC 47F,TC 48,SC 48B,SC 48D,TC 49,TC 51,TC
55,TC 56,TC 57,TC 59,SC 59A,SC 59C,SC 59D,SC
59F,SC 59K,SC 59L,SC 59M,SC 59N,TC 61,SC 61B,SC
61C,SC 61D,SC 61H,SC 61J,TC 62,SC 62A,SC 62B,SC
62C,SC 62D,TC 64,TC 65,SC 65A,SC 65B,SC 65C,SC
65E,TC 66,TC 68,TC 69,TC 70,TC 72,TC 73,TC 76,TC
77,SC 77A,SC 77B,SC 77C,TC 78,TC 79,TC 80,TC 81,TC
82,TC 85,TC 86,SC 86A,SC 86B,SC 86C,TC 87,TC 88,TC
89,TC 90,TC 91,TC 94,TC 95,TC 96,TC 97,TC 99,TC
100,TA 1,TA 2,TA 5,TA 6,TA 15,TA 17,TA 18,TA 19,TA
20,TA 21,TC 101,TC 103,TC 104,TC 105,TC 106,TC
107,TC 108,TC 109,TC 110,TC 111,TC 112,TC 113,TC
114,TC 115,TC 116,TC 117,PC 118,TC 119,TC 120,TC
121,SC 121A,SC 121B,TC 122,TC 123,TC 124,TC
125,PC 126,PC
127,CISPR,CIS/A,CIS/B,CIS/D,CIS/F,CIS/H,CIS/I
ASPECTS CONCERNED:
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.
file, to make a copy and to print out the content for the sole purpo se 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.

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 t hey 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” clau ses to
be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for submitting ISC c lauses.
(SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Quantities and units - Part 17: Time dependency

PROPOSED STABILITY DATE: 2030
NOTE FROM TC/SC OFFICERS:
Link to Committee Draft for Vote (CDV) online document:
Click here
How to access
This link leads you to the Online Standards Development (OSD) platform for National Mirror Committee’s (NMC)
comments. The project draft may be found further down this document.

Resource materials
We recommend NCs to review the available materials to better understand the member commenting on the OSD
platform. This includes the:
• OSD NC roles overview
• How to add and submit comments to the IEC

Contact
Should you require any assistance, please contact the IEC IT Helpdesk.

IEC CDV 80000-17 © IEC 2026
CONTENTS
Contact . 3
CONTENTS . 1
FOREWORD . 2
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and Definitions . 6
4 Names and symbols for time-dependent quantities . 6
4.1 General . 6
4.2 Quantities that vary with time periodically . 7
4.2.1 General . 7
4.2.2 Sinusoidal quantities. 7
4.2.3 Root-mean-square value ,RMS value, effective value . 7
4.3 Succession and position of information subscripts . 7
5 Tables for time-dependent quantities . 8
Annex A (informative) Examples of time-dependent quantities . 12
A.1 Examples of alternating quantities . 12
A.2 Examples of transient quantities . 17
A.3 Example of a random quantity . 19
Bibliography . 20

Figure A.1 – Sum of a constant component 𝑋0 and an alternating component 𝑥a . 12
Figure A.2 – Sum of two alternating components . 13
Figure A.3 – Product of two alternating components . 14
Figure A.4 – Sum of a constant component and two alternating components . 15
Figure A.5 – Sum of a constant component and three alternating components . 16
Figure A.6 – Product of a varying component and an alternating component . 17
Figure A.7 – Sum of two varying components and one alternating component. 18
Figure A.8 – Sum of a constant component and a random variable . 19

Table 1 – Symbols for time-dependent quantities . 8
Table 2 – Symbols for average quantities . 9
Table 3 – Symbols for components of a combined quantity . 9
Table 4 – Symbols for some instantaneous or average values of a component . 10
Table 5 – Distributions, singularity functions . 10

IEC CDV 80000-17 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Quantities and units -
Part 17: Time dependency
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 corres ponding 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) 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/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
IEC CDV 80000-17 © IEC 2026
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 80000-17:202X has been prepared by TC 25/JWG 2: Revision and amendments of IEC-
related parts of ISO/IEC 80000 series of IEC technical committee TC25: Quantities and units.
It is an International Standard.
This 1st edition together with the future forthcoming Part 16 (Printing and writing rules) will
cancel and replace IEC 60027-1:1992+COR1:1993+AMD1:1997+AMD2:2005 ED6.0, Letter
symbols to be used in electrical technology - Part 1: General.
This new part is an excerpt from IEC 60027-1 according to IEC/TC 25 decision 2017/25-07
(Document 25/614/DL). This draft contains Clause 2, tables 9 and 10, and Annex C of
publication IEC 60027-1 Ed 6: 1995.
IEC 80000 consists of the following parts, under the general title Quantities and units:
Part 6: Electromagnetism
Part 13: Information science and technology
Part 15: Logarithmic and related quantities, and their units
Part 16: Printing and writing rules
Part 17: Time dependency
The following parts are published by ISO:
Part 1: General
Part 2: Mathematics
Part 3: Space and time
Part 4: Mechanics
Part 5: Thermodynamics
Part 7: Light
Part 8: Acoustics
Part 9: Physical chemistry and molecular physics
Part 10: Atomic and nuclear physics
Part 11: Characteristic numbers
Part 12: Condensed matter physics
The text of this International Standard is based on the following documents:
IEC CDV 80000-17 © IEC 2026
Draft Report on voting
25/XX/FDIS 25/XX/RVD
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 .
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 CDV 80000-17 © IEC 2026
INTRODUCTION
Time-dependent quantities can be periodic, transient or random and can be often represented
by a combination, e.g. sum, product, polynomial, etc., of components which are functions such
as trigonometric functions, exponentials, distributions, etc. They are denoted by specific
symbols which also can express specific characteristics like maximum, minimum, average by
various graphemes like subscripts, superscripts, diacritics, underscore, etc.
For time-dependent quantities, several different systems have been developed and used
depending on the number and the choice of base quantities on which the system is based.
However, in time dependency and electrical engineering, only the International Sys tem of
Quantities, ISQ, and the associated International System of Units, SI, are acknowledged and
are reflected in the standards of ISO and IEC. The SI has seven base units, among them meter,
symbol m, kilogram, symbol kg, second, symbol s, and ampere, symbol A.
The various possibilities for symbols for time-dependent quantities are presented in tables with
examples. No specific quantities are considered but place holders or abstract quantities.
All symbols and graphemes are language independent.
The items given in IEC 80000-17 are generally in conformity with the International
Electrotechnical Vocabulary (IEV).
...