oSIST prEN IEC 60034-8:2025
(Main)Rotating electrical machines - Part 8: Terminal markings and direction of rotation
Rotating electrical machines - Part 8: Terminal markings and direction of rotation
Drehende elektrische Maschinen - Teil 8: Anschlussbezeichnungen und Drehsinn
Machines électriques tournantes - Partie 8: Marquages d'extrémité et sens de rotation
Električni rotacijski stroji - 8. del: Oznake priključkov in smeri vrtenja (rotacije)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2025
Električni rotacijski stroji - 8. del: Oznake priključkov in smeri vrtenja (rotacije)
Rotating electrical machines - Part 8: Terminal markings and direction of rotation
Drehende elektrische Maschinen - Teil 8: Anschlussbezeichnungen und Drehsinn
Machines électriques tournantes - Partie 8: Marquages d'extrémité et sens de rotation
Ta slovenski standard je istoveten z: prEN IEC 60034-8:2025
ICS:
29.160.01 Rotacijski stroji na splošno Rotating machinery in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
2/2246/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60034-8 ED4
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-06-20 2025-09-12
SUPERSEDES DOCUMENTS:
2/2202/CD, 2/2241A/CC
IEC TC 2 : ROTATING MACHINERY
SECRETARIAT: SECRETARY:
United Kingdom Mr Charles Whitlock
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
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.
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:
Rotating electrical machines - Part 8: Terminal markings and direction of rotation
PROPOSED STABILITY DATE: 2027
NOTE FROM TC/SC OFFICERS:
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
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IEC 60034-8 ED4 © IEC 2025 2
1 CONTENTS
2 FOREWORD . 5
3 INTRODUCTION . 7
4 1 Scope . 8
5 2 Normative references . 8
6 3 Terms and definitions . 8
7 4 Symbols . 11
8 4.1 General . 11
9 4.2 DC and single-phase commutator machines . 11
10 4.3 AC machines without commutators . 11
11 4.4 Auxiliary devices . 11
12 5 Direction of rotation . 12
13 6 Rules for terminal markings . 12
14 6.1 General . 12
15 6.2 Suffixes . 14
16 6.3 Prefixes . 15
17 6.4 Winding identification for categories of machines . 15
18 6.5 Synchronous machines . 16
19 6.6 DC machines . Error! Bookmark not defined.
20 6.7 Relation between terminal markings and direction of rotation . 16
21 6.8 Terminal marking figures . 17
22 7 Auxiliary terminal marking rules . 23
23 7.1 General . 23
24 7.2 Marking . 23
26 Annex A (normative) Connection diagrams for common applications . 26
28 Figure 1 – Single three-phase winding, three elements, open connection, six terminals . 18
29 Figure 2 – Single three-phase winding, delta connection, three terminals . 19
30 Figure 3 – Single three-phase winding, internal star connection with neutral conductor,
31 four terminals . 19
32 Figure 4 – Single three-phase winding, two elements per phase, open connection,
33 twelve terminals . 19
34 Figure 5 – Single three-phase winding, four elements per phase, open connection,
35 twenty-four terminals . 19
36 Figure 6 – Single three-phase winding, two elements per phase with four tapping
37 points per element, open connection, thirty-six terminals . 20
38 Figure 7 – Two separate three-phase windings with two independent functions, two
39 elements per phase, open connection, twenty-four terminals . 20
40 Figure 8 – Two elements, internal connection, three terminals . 20
41 Figure 9 – Single three-phase winding, star connection, duplicate terminals for
42 alternate connection, six terminals . 20
43 Figure 10 – Single three-phase winding, star connection, parallel terminals for shared
44 current, six terminals . 21
IEC 60034-8 ED4 © IEC 2025 3
46 Figure 11 – Three-phase wound-rotor, star connections with neutral conductors, eight
47 terminals . 21
48 Figure 12 – Main and auxiliary winding, two elements . 21
49 Figure 13 – Single-phase auxiliary winding, integrally connected capacitor, one
50 element . 21
51 Figure 14 – Single-phase main winding, integrally connected thermal protector, one
52 element . 21
53 Figure 15 – Six-phase winding, open connection, six elements . 21
54 Figure 16 – Armature winding, one element . 22
55 Figure 17 – Commutating winding, one and two elements . 22
56 Figure 18 – Compensating winding, one and two elements . 22
57 Figure 19 – Series winding, one element, two tappings . 22
58 Figure 20 – Shunt excitation winding, one element . 22
59 Figure 21 – Separately excited excitation winding, one and two elements . 22
60 Figure 22 – Direct-axis auxiliary winding, one element . 22
61 Figure 23 – Quadrature-axis auxiliary winding, one element . 22
62 Figure 24 – Armature winding with commutating and compensating windings, one
63 element . 22
64 Figure 25 – Single-phase, single voltage . 23
65 Figure 26 – Single-phase, dual voltage . 24
66 Figure 27 – Three-phase, single voltage . 24
67 Figure 28 – Three-phase, dual voltage . 24
68 Figure 29 – Two-lead devices (except type R) . 24
69 Figure 31 – Three-lead devices of type R . 25
70 Figure 32 – Four-lead devices of type R . 25
71 Figure 33 – Switch connections . 25
72 Figure A.1 – Delta connection . 26
73 Figure A.2 – Star connection – with or without neutral . 26
74 Figure A.3 – Dual voltage, six terminals (1:√3) . 26
75 Figure A.4 – Star-connected, dual voltage, nine terminals (1:2) . 27
76 Figure A.5 – Delta-connected, dual voltage, nine terminals (1:2) . 27
77 Figure A.6 – Star-delta, single voltage, six terminals . 27
78 Figure A.7 – Star-delta, dual voltage, twelve terminals (1:2) . 28
79 Figure A.8 – Part-winding, single voltage, six terminals . 28
80 Figure A.9 – Part-winding, dual voltage, nine terminals (1:2). 29
81 Figure A.10 – Variable-torque, six terminals . 29
82 Figure A.11 – Variable-torque, dual-voltage (1:√3), nine terminals . 30
83 Figure A.12 – Constant-torque, six terminals . 31
84 Figure A.13 – Constant power, six terminals . 31
85 Figure A.14 – Variable-torque, six terminals . 32
86 Figure A.15 – Constant-torque, seven terminals . 32
87 Figure A.16 – Constant-power, seven terminals . 32
IEC 60034-8 ED4 © IEC 2025 4
89 Figure A.17 – Example of three-speed, constant torque motor using two separate
90 windings, ten terminals . 33
91 Figure A.18 – Example of three-speed motor using three separate windings, ten
92 terminals . 33
93 Figure A.19 – Example of four-speed, variable-torque motor using two separate
94 windings, twelve terminals . 34
95 Figure A.20 – Split-phase or capacitor-start reversible motor . 34
96 Figure A.21 – Reversible capacitor-start motor with four terminals with externally
97 connected capacitor . 35
98 Figure A.22 – Shunt motor or generator, four terminals . 35
99 Figure A.23 – Compound-motor or generator with compensating and commutating
100 windings, six terminals . 35
101 Figure A.24 – Series-wound motor, two terminals . 36
IEC 60034-8 ED4 © IEC 2025 5
103 INTERNATIONAL ELECTROTECHNICAL COMMISSION
104 ____________
106 ROTATING ELECTRICAL MACHINES –
108 Part 8: Terminal markings and direction of rotation
111 FOREWORD
112 1) The International Electrotechnical Commission (IEC) is a worldwide organization f
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