EN IEC 60375:2018

SLOVENSKI STANDARD
01-oktober-2018
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SIST EN 60375:2004
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Conventions concerning electric circuits (IEC 60375:2018)
Conventions concernant les circuits électriques (IEC 60375:2018)
Ta slovenski standard je istoveten z: EN IEC 60375:2018
ICS:
17.220.01 Elektrika. Magnetizem. Electricity. Magnetism.
Splošni vidiki General aspects
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60375

NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2018
ICS 01.060; 01.080.40 Supersedes EN 60375:2003
English Version
Conventions concerning electric circuits
(IEC 60375:2018)
Conventions concernant les circuits électriques Vereinbarungen für Stromkreise
(IEC 60375:2018) (IEC 60375:2018)
This European Standard was approved by CENELEC on 2018-06-12. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, 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
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60375:2018 E
European foreword
The text of document 25/620/FDIS, future edition 3 of IEC 60375, prepared by IEC/TC 25 "Quantities
and units, and their letter symbols" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 60375:2018.
The following dates are fixed:
(dop) 2019-03-12
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2021-06-12
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60375:2003.

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 60375:2018 was approved by CENELEC as a European
Standard without any modification.
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.cenelec.eu.
Publication Year Title EN/HD Year

IEC 60617-DB -  Graphical symbols for diagrams - -

IEC 60375 ®
Edition 3.0 2018-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Conventions concerning electric circuits

Conventions concernant les circuits électriques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 01.060; 01.080.40 ISBN 978-2-8322-5597-1

– 2 – IEC 60375:2018 © IEC 2018
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Orientation of geometrical objects . 15
4.1 Orientation of a curve . 15
4.2 Orientation of a surface. 15
4.3 Arrows perpendicular to the plane of the figure . 15
5 Conventions concerning currents . 15
5.1 Physical direction of current . 15
5.2 Reference direction of current . 16
5.3 Indication of the reference direction for currents . 16
5.3.1 Indication of the reference direction for currents for a branch . 16
5.3.2 Indication of the reference direction for mesh currents . 16
5.4 Kirchhoff law for nodes . 17
6 Conventions concerning voltages . 17
6.1 Physical polarity of voltage . 17
6.2 Reference polarity for a pair of nodes . 18
6.3 Indication of the reference polarity . 18
6.3.1 First method . 18
6.3.2 Second method. 18
6.3.3 Third method . 19
6.4 Kirchhoff law for meshes . 19
7 Conventions concerning power . 20
7.1 Physical direction of power . 20
7.2 Reference direction of power . 20
7.3 Indication of the reference direction of power . 20
7.4 Combined conventions . 20
7.4.1 General . 20
7.4.2 Motor convention . 21
7.4.3 Generator convention . 21
8 Conventions concerning two-port networks . 21
9 Conventions concerning sources . 22
9.1 Conventions concerning voltage sources . 22
9.1.1 Independent voltage sources . 22
9.1.2 Controlled voltage sources . 22
9.2 Conventions concerning current sources . 23
9.2.1 Independent current sources . 23
9.2.2 Controlled current sources . 23
10 Conventions concerning passive elements. 24
10.1 General conventions . 24
10.2 Resistive elements . 24
10.2.1 Resistive two-terminal elements . 24
10.2.2 Resistive n-terminal elements . 25
10.3 Capacitive elements . 26
10.3.1 Capacitive two-terminal elements . 26

IEC 60375:2018 © IEC 2018 – 3 –
10.3.2 Capacitive n-terminal elements . 27
10.4 Inductive elements . 29
10.4.1 Inductive two-terminal elements . 29
10.4.2 Inductive n-port elements . 30
11 Complex notation . 32
11.1 General . 32
11.2 Conventions concerning complex representation of sinusoidal quantities . 32
11.3 Reference direction of a complex current . 32
11.4 Reference polarity for a complex voltage . 33
11.5 Complex representation of Ohm's law . 34
11.6 Conventions concerning the graphical representation of phasors . 35
11.7 Conventions concerning phase differences . 35
11.8 Conventions concerning power . 36
11.8.1 Time-dependent electric power . 36
11.8.2 Complex power . 36
Bibliography . 37

Figure 1 – Orientation of a curve . 15
Figure 2 – Orientation of a surface . 15
Figure 3 – Indication of the reference direction for a current by an arrow . 16
Figure 4 – Indication of the reference direction using the node names . 16
Figure 5 – Indication of the reference direction for mesh currents . 17
Figure 6 – Examples of the Kirchhoff law for nodes . 17
Figure 7 – Indication of the reference polarity by means of plus and minus signs . 18
Figure 8 – Simplified indication of the reference polarity by means of plus signs . 18
Figure 9 – Indication of the reference polarity by an arrow . 18
Figure 10 – Indication of the reference polarity using the node names . 19
Figure 11 – Simplified indication of the reference polarity using the node names . 19
Figure 12 – Examples of the Kirchhoff law for meshes . 20
Figure 13 – Indication of the reference direction of power . 20
Figure 14 – Examples of motor conventions . 21
Figure 15 – Examples of generator conventions . 21
Figure 16 – A reference convention for a two-port network. 22
Figure 17 – Graphical representation of
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