IEC 60034-8:2007

INTERNATIONAL IEC
STANDARD
CEI
60034-8
NORME
Third edition
INTERNATIONALE
Troisième édition
2007-06
Rotating electrical machines –
Part 8:
Terminal markings and direction of rotation

Machines électriques tournantes –
Partie 8:
Marques d’extrémité et sens de rotation
Reference number
Numéro de référence
IEC/CEI 60034-8:2007
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INTERNATIONAL IEC
STANDARD
CEI
60034-8
NORME
Third edition
INTERNATIONALE
Troisième édition
2007-06
Rotating electrical machines –
Part 8:
Terminal markings and direction of rotation

Machines électriques tournantes –
Partie 8:
Marques d’extrémité et sens de rotation
PRICE CODE
V
CODE PRIX
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
Pour prix, voir catalogue en vigueur

– 2 – 60034-8 © IEC:2007
CONTENTS
FOREWORD.5
INTRODUCTION.7
1 Scope.8
2 Normative references.8
3 Terms and definitions .8
4 Symbols.10
4.1 General.10
4.2 DC and single-phase commutator machines .10
4.3 AC machines without commutators.10
4.4 Auxiliary devices .11
5 Direction of rotation.11
6 Rules for terminal markings .11
6.1 General.11
6.2 Suffixes.12
6.3 Prefixes.13
6.4 Winding identification for categories of machines .13
6.5 Synchronous machines.14
6.6 DC machines.14
6.7 Relation between terminal markings and direction of rotation .14
6.8 Terminal marking figures .15
7 Auxiliary terminal marking rules.20
7.1 General.20
7.2 Marking.20

Annex A (normative) Connection diagrams for common applications.23

Figure 1 – Single three-phase winding, three elements, open connection, six terminals .15
Figure 2 – Single three-phase winding, delta connection, three terminals .16
Figure 3 – Single three-phase winding, internal star connection with neutral conductor,
four terminals.16
Figure 4 – Single three-phase winding, two elements per phase, open connection,
twelve terminals.16
Figure 5 – Single three-phase winding, four elements per phase, open connection,
twenty-four terminals .16
Figure 6 – Single three-phase winding, two elements per phase with four tapping
points per element, open connection, thirty-six terminals .17
Figure 7 – Two separate three-phase windings with two independent functions, two
elements per phase, open connection, twenty-four terminals .17
Figure 8 – Two elements, internal connection, three terminals .17
Figure 9 – Single three-phase winding, star connection, duplicate terminals for
alternate connection, six terminals.
Figure 10 – Single three-phase winding, star connection, parallel terminals for shared
current, six terminals .18

60034-8 © IEC:2007 – 3 –
Figure 11 – Three-phase wound-rotor, star connections with neutral conductors, eight
terminals.18
Figure 12 – Main and auxiliary winding, two elements.18
Figure 13 – Single-phase auxiliary winding, integrally connected capacitor, one
element .18
Figure 14 – Single-phase main winding, integrally connected thermal protector, one
element .18
Figure 15 – Six-phase winding, open connection, six elements .18
Figure 16 – Armature winding, one element .19
Figure 17 – Commutating winding, one and two elements .19
Figure 18 – Compensating winding, one and two elements .19
Figure 19 – Series winding, one element, two tappings.19
Figure 20 – Shunt excitation winding, one element .19
Figure 21 – Separately excited excitation winding, one and two elements.19
Figure 22 – Direct-axis auxiliary winding, one element.19
Figure 23 – Quadrature-axis auxiliary winding, one element .19
Figure 24 – Armature winding with commutating and compensating windings, one
element .19
Figure 25 – Single-phase, single voltage .20
Figure 26 – Single-phase, dual voltage .20
Figure 27 – Three-phase, single voltage .21
Figure 28 – Three-phase, dual voltage.21
Figure 29 – Two-lead devices (except type R) .21
Figure 30 – Two-lead devices of type R .21
Figure 31 – Three-lead devices of type R.22
Figure 32 – Four-lead devices of type R .22
Figure 33 – Switch connections .22
Figure A.1 – Delta connection.23
Figure A.2 – Star connection – with or without neutral .23
Figure A.3 – Dual voltage, six terminals (1:√3).23
Figure A.4 – Star-connected, dual voltage, nine terminals (1:2) .24
Figure A.5 – Delta-connected, dual voltage, nine terminals (1:2).24
Figure A.6 – Star-delta, single voltage, six terminals.24
Figure A.7 – Star-delta, dual voltage, twelve terminals (1:2) .25
Figure A.8 – Part-winding, single voltage, six terminals .25
Figure A.9 – Part-winding, dual voltage, nine terminals (1:2).26
Figure A.10 – Variable-torque, six terminals .26
Figure A.11 – Variable-torque, dual-voltage (1:√3), nine terminals .27
Figure A.12 – Constant-torque, six terminals .28
Figure A.13 – Constant power, six terminals .28
Figure A.14 – Variable-torque, six terminals .29
Figure A.15 – Constant-torque, seven terminals.29
Figure A.16 – Constant-power, seven terminals .29

– 4 – 60034-8 © IEC:2007
Figure A.17 – Example of three-speed, constant torque motor using two separate
windings, ten terminals .30
Figure A.18 – Example of three-speed motor using three separate windings, ten
terminals.30
Figure A.19 – Example of four-speed, variable-torque motor using two separate
windings, twelve terminals .31
Figure A.20 – Split-phase or capacitor-start reversible motor .31
Figure A.21 – Reversible capacitor-start motor with four terminals with externally
connected capacitor.32
Figure A.22 – Shunt motor or generator, four terminals.32
Figure A.23 – Compound-motor or generator with compensating and commutating
windings, six terminals.32
Figure A.24 – Series-wound motor, two terminals .33

60034-8 © IEC:2007 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –

Part 8: Terminal markings and direction of rotation

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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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 60034-8 has been prepared by IEC technical committee 2:
Rotating machinery.
This third edition of IEC 60034-8 cancels and replaces the second edition published in 2002
and constitutes a technical revision.
The main change with respect to the previous edition is listed below:
– changed terminal markings for d.c. machines in Clause A.4.

– 6 – 60034-8 © IEC:2007
The text of this standard is based on the following documents:
FDIS Report on voting
2/1434/FDIS 2/1451/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts of the IEC 60034 series, under the general title Rotating electrical
machines, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
60034-8 © IEC:2007 – 7 –
INTRODUCTION
The revision of this part of IEC 60034 provides worldwide uniformity in the electrical
connections for rotating electrical machines and applies the recommendations of the basic
safety publication IEC 60445 in specifying marking requirements.
These standardized connections will then permit the safe interchange of electric machines
with their control and protective devices using standardized terminal markings.

– 8 – 60034-8 © IEC:2007
ROTATING ELECTRICAL MACHINES –

Part 8: Terminal markings and direction of rotation

1 Scope
This part of IEC 60034 applies to a.c. and d.c. machines and specifies
a) rules for the identification of winding connection points;
b) marking of winding terminals;
c) direction of rotation;
d) relationship between terminal markings and direction of rotation;
e) terminal marking of auxiliary devices;
f) connection diagrams of machines for common applications.
Turbine-type synchronous machines are excluded from this standard.
2 Normative references
The following referenced documents are indispensable for the application 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 60034-1, Rotating electrical machines – Part 1: Rating and performance
IEC 60417-1,Graphical symbols for use on equipment – Part 1: Overview and application
IEC 60445, Basic and safety principles for man-machine interface, marking and identification
– Identification of equipment terminals and conductor terminations
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60034-1 and the
following apply.
3.1
terminal marking
permanent identification of the external termination of winding leads or auxiliary leads at the
disposal of the user for connection of the machine to the supply or apparatus that indicates
the function of the termination
3.2
connecting points
all current transfer points that are used to permanently interconnect winding or winding
element ends internally
60034-8 © IEC:2007 – 9 –
3.3
tapping points
intermediate connections to a portion of a winding element
3.4
winding leads
insulated conductors that make the electrical connection between a winding and its
termination
3.5
winding
assembly of turns or coils having a defined function in an electrical rotating machine
[IEV 411-37-01]
3.6
winding phase
one or more winding elements associated with a particular phase
3.7
winding element
part of a winding, all the turns or coils in that part being permanently connected together
3.8
separate windings
two or more windings, each having a separate function, and not interconnected, used only
separately, whether fully or in part
3.9
multi-speed motor
motor, which can be operated at any one of two or more definite speeds
3.10
constant power
when a multi-speed motor provides approximately constant power over the speed range
3.11
constant torque
when a multi-speed motor provides approximately constant torque over the speed range
3.12
variable torque
when output torque of a multi-speed motor is proportional to approximately the square of the
speeds
3.13
phase sequence
order in which the voltages successively reach their maximum positive values between supply
conductors
– 10 – 60034-8 © IEC:2007
3.14
D-end
that end of the machine which accommodates the shaft end
[IEV 411-43-36]
NOTE For machines having two shaft ends, the D-end is the end
a) having the larger diameter;
b) opposite the external fan when the shaft ends are of the same diameter.

4 Symbols
4.1 General
L Supply conductor
PE Protective earthing terminal
User available terminal, marking mandatory
Internal connection point
(.) Internal terminal marking (showing element symbol), optional
[ . , . ] Grouping of user joined terminals
; Separation of terminals or groups of terminals
4.2 DC and single-phase commutator machines
A Armature winding
B Commutating winding
C Compensating winding
D Series excitation winding
E Shunt excitation winding
F Separately excited winding
H Direct-axis auxiliary winding
J Quadrature-axis auxiliary winding
4.3 AC machines without commutator
F DC excitation winding
K Secondary winding
L Secondary winding
M Secondary winding
N Star point (neutral conductor) of the primary winding
Q Star point (neutral conductor) of a secondary winding
U Primary winding
V Primary winding
W Primary winding
Z Auxiliary windings
NOTE The primary and secondary symbol allocations are irrespective of whether the primary winding is located in
the stator or rotor.
60034-8 © IEC:2007 – 11 –
4.4 Auxiliary devices
BA AC brakes
BD DC brakes
BW Brush-wear detector
CA Capacitors
CT Current transformer
HE Heaters
LA Lightning arrestor
PT Potential transformer
R Resistance thermometers
SC Surge capacitor
SP Surge protectors
S Switches including plugging switches
TB Thermostats opening on increase of temperature
TC Thermocouples
TM Thermostats closing on increase of temperature
TN Thermistors, negative temperature coefficient
TP Thermistors, positive temperature coefficient
NOTE This table standardizes the most commonly used auxiliary devices. The
designation of other devices may be chosen by the manufacturer.
5 Direction of rotation
The direction of rotation shall be that of the shaft observed when facing the D-end.
Machines with terminal markings according to this standard shall have a clockwise direction of
rotation.
For other configurations, including unidirectional machines, an arrow located on the enclosure
shall show the direction of rotation.
6 Rules for terminal markings
6.1 General
6.1.1 Application
A terminal marking shall identify all winding and auxiliary device terminations accessible to
the user.
NOTE External line connections and winding arrangements used for common applications are shown in Annex A.
6.1.2 Marking instructions
All three-phase a.c. machines with more than three terminals and all other machines (and
auxiliary devices) with more than two terminals shall have connecting instructions consistent
with this standard.
– 12 – 60034-8 © IEC:2007
6.1.3 Alphanumeric marking notation
The terminal marking comprises upper-case Latin characters and Arabic numerals. The
characters shall be arranged without spaces.
Each winding, winding phase or auxiliary circuit shall be assigned a letter symbol(s) in
accordance with Clause 4.
To prevent confusion with the numerals 1 and 0, the letters “I” and “O” shall not be used.
6.1.4 Duplicate winding terminals
Several leads of a machine can have the same marking only if each of them is capable of
completely fulfilling the same electrical function, so that either one of them can be used for
the connection. See Figure 9.
6.1.5 Shared terminals
When several leads or conductors are provided to share the current, the terminal markings
shall be identified by an additional numerical suffix separated by a hyphen. See Figure 10.
Some multi-speed motors having two or more independent windings may produce circulating
currents in the de-energized winding. In this case, the terminal markings for the open delta
connection shall be identified by an additional numerical suffix separated by a hyphen. See
Figure A.15.
6.1.6 Omissions
Numerical suffixes and/or prefixes may be omitted if there is no risk of confusion. See
Figure 2.
When two or more elements are connected to the same terminal its marking shall be
determined from one of the elements. The order of precedence shall be determined by the
lower suffix. See Figure 8.
When two or more functionally different elements are connected internally, the combination of
elements shall be considered a single element and the terminal marking shall have the alpha
notation of the primary element function. See Figure 24.
6.1.7 Earthing terminal
The termination for the protective earthing conductor shall be marked with the letters PE
according to IEC 60445 (or marked with symbol IEC 60417-5019:2006-08). No other terminals
shall be so marked.
6.2 Suffixes
6.2.1 Winding elements
The ends of each winding element are distinguished by a numerical suffix, in accordance with
IEC 60445, as follows (see Figure 5):
1 and 2 for the first winding element (see Figure 1),
3 and 4 for the second winding element,
5 and 6 for the third winding element,
7 and 8 for the fourth winding element.

60034-8 © IEC:2007 – 13 –
In all winding elements, the end closer to the supply connection shall be marked with the
lower of the two numbers.
6.2.2 Internal connections
When several ends of winding elements are joined, the terminal marking shall use the lower
suffix; see Figure 8.
6.2.3 Tapping points
Tapping points of a winding element shall be marked in the sequence in which they occur in
the winding element, as follows (see Figure 6):
11, 12, 13, etc. for the first winding element,
31, 32, 33, etc. for the second winding element,
51, 52, 53, etc. for the third winding element,
71, 72, 73, etc. for the fourth winding element.
The tap closest to the beginning of the winding shall be marked with the lowest suffix.
6.3 Prefixes
Winding elements that are separate (or belong to different current systems), but have a
similar, but independent, function, shall be marked with the same letter, but distinguished by a
numerical prefix.
Each of the terminals shall be marked with a numerical prefix corresponding to the separate
winding (or current system) to which it belongs, as follows (see Figure 7):
first winding 1
second winding 2
third winding 3
fourth winding 4
and so on…
With multi-speed machines, the sequence of the prefixes corresponds to the sequence of
increasing speeds. See Figure A.19.
6.4 Winding identification for categories of machines
6.4.1 Three-phase machines
The letter symbols shall be U, V, and W for the first, second and third primary winding phase
respectively and N when a neutral conductor is used (see Figure 3) and K, L, and M and Q
when a secondary winding is used. See Figure 11.
6.4.2 Two-phase machines
The terminal markings of a two-phase machine shall be derived from the markings for three-
phase machines, with the letter symbols W and M omitted.
6.4.3 Single-phase machines
The letter symbols assigned shall be U for the primary winding and Z for the auxiliary winding.
See Figure 12.
– 14 – 60034-8 © IEC:2007
If the winding ends of a main and an auxiliary winding are connected to a common terminal,
the terminal shall be marked according to the rule for the main phase.
6.4.4 Multiple three-phase group (for example, six-phase) machines
Each phase group shall be differentiated by a prefix according to 6.3. See Figure 15.
The numerical order of the prefix shall increase according to the order in which the U phase of
each phase group reaches its maximum.
6.5 Field winding of synchronous machines
Terminal markings of the d.c. separately excited field windings shall be F1 and F2.
6.6 DC machines
The letter symbols assigned to winding elements shall be as listed in 4.2 with terminal
markings as shown in Figures 16 to 24.
6.7 Relation between terminal markings and direction of rotation
6.7.1 Multi-phase machines
The terminal markings shall be so arranged that clockwise rotation is obtained when the
alphabetical sequence of the letters (for example, U1, V1, W1) corresponds to the time
sequence of the system phase voltages. The phase sequence of a secondary winding (for
example, K, L, M) shall correspond to the phase sequence of the primary winding (for
example, U, V, W).
For counter-clockwise rotation, the time sequence of the system phase voltages shall be
reversed by rearrangement of the supply cables (for example, L2 and L3 in the case of 3-
phase).
The requirement in this clause applies to machines of any rated output and voltage even if
clockwise rotation is impracticable.
When machines are suitable for operation in only one direction of rotation, an arrow shall
indicate the direction of rotation. This arrow need not be on the rating plate, but it shall be
permanently attached and easily visible.
6.7.2 Multi-phase, multi-speed machines
With multi-speed machines incorporating a pole-changing winding, such as a Dahlander or
PAM (pole-amplitude-modulated) winding, the markings of the terminals for the lower speed of
these winding(s), which are to be connected to the supply (for example, 1U and 1W) shall be
interchanged, when necessary, in order to obtain the same direction of rotation for both
speeds.
6.7.3 Single-phase machines
Clockwise rotation shall be obtained when the supply is connected to U1 and U2 and the
auxiliary winding is connected as Z1 with U1 and Z2 with U2. To reverse the direction of
rotation, terminals Z1 shall be connected to U2 and Z2 to U1.

60034-8 © IEC:2007 – 15 –
6.7.4 Multiple three-phase group (for example, six-phase) machines
The terminal markings shall be so arranged that clockwise rotation is obtained when the
alphabetical sequence of the letters in each phase group corresponds to the time sequence of
the system phase voltages connected to this group. The order of prefixes of the groups
corresponds to the sequence in which the first phase of each phase group reaches its
maximum value.
For counter-clockwise rotation, the time sequence of the system phase voltages shall be
reversed by the rearrangement of the supply cables within each group and by reversing the
order of connecting the groups of the supply voltages to the phase groups of the windings.
6.7.5 DC machines
The terminal markings shall be so arranged that clockwise rotation is obtained when the line
polarities L+ and L– correspond to the polarities of the terminals A1 and A2. When the
machine is provided with a separately-excited field winding, the terminal markings shall be so
arranged that clockwise rotation is obtained when the line polarities L+ and L– correspond to
the polarities of both the terminals A1 and A2 and the terminals F1 and F2.
For counter-clockwise rotation, the polarity of the supply connection to either the armature or
the field shall be reversed taking into account 6.7.6.
6.7.6 Relation between direction of current and magnetic field (d.c. machines)
6.7.6.1 Two excitation windings generate fields having the same direction if the excitation
current in both windings flows from the terminal with the lower (higher) numerical suffix to the
terminal with the higher (lower) suffix.
6.7.6.2 The magnetic fields of commutating and compensating windings shall be of correct
polarity with respect to each other and to the magnetic field of the armature winding if, in all
the windings, current flows from the terminal with the lower (higher) numerical suffix to the
terminal with the higher (lower) suffix.
6.8 Terminal marking figures
Connection diagrams for common applications are shown in Annex A.
6.8.1 Three-phase asynchronous machines
U1    V1    W1
U2    V2    W2
Figure 1 – Single three-phase winding, three elements,
open connection, six terminals

– 16 – 60034-8 © IEC:2007
U     V    W
Figure 2 – Single three-phase winding, delta connection, three terminals
U     V    W    N
Figure 3 – Single three-phase winding, internal star connection with
neutral conductor, four terminals
U1    V1   W1
U2    V2   W2
U3    V3   W3
U4    V4   W4
Figure 4 – Single three-phase winding, two elements per phase,
open connection, twelve terminals
U1    V1   W1
U2    V2   W2
U3    V3   W3
U4    V4   W4
U5    V5   W5
U6    V6   W6
U7    V7   W7
U8    V8   W8
Figure 5 – Single three-phase winding, four elements per phase,
open connection, twenty-four terminals

60034-8 © IEC:2007 – 17 –
U1          V1         W1
W11
U11
V11
U12 W12
V12
W13
U13 V13
W14
U14
V14
U2          V2         W2
U3          V3         W3
U31 V31 W31
U32 V32 W32
U33 V33 W33
U34 V34 W34
U4          V4          W4

Figure 6 – Single three-phase winding, two elements per phase with four tapping points
per element, open connection, thirty-six terminals
1U1    1V1    1W1           2U1     2V1     2W1
1U2    1V2   1W2          2U2     2V2    2W2
1U3    1V3    1W3         2U3     2V3     2W3
1U4    1V4    1W4         2U4     2V4     2W4

Figure 7 – Two separate three-phase windings with two independent functions,
two elements per phase, open connection, twenty-four terminals
U2
U1 (U2) (U3)
U4
Figure 8 – Two elements, internal connection, three terminals
U U
V V
W W
(U1) (V1) (W1)
(U2) (V2)
(W2)
Figure 9 – Single three-phase winding, star connection, duplicate terminals
for alternate connection, six terminals

– 18 – 60034-8 © IEC:2007
U1-1
U1-2
V1-1
(U1) (V1) (W1)
V1-2
(U2) (V2) (W2)
W1-1
W1-2
Figure 10 – Single three-phase winding, star connection,
parallel terminals for shared current, six terminals
U    V    W     N
K     L     M      Q

Figure 11 – Three-phase wound-rotor, star connections
with neutral conductors, eight terminals
6.8.2 Single-phase asynchronous machines
U1       U2  Z1      Z2

Figure 12 – Main and auxiliary winding, two elements
Z1 Z2
Figure 13 – Single-phase auxiliary winding,
integrally connected capacitor, one element
U2
U1
TP
Figure 14 – Single-phase main winding, integrally connected
thermal protector, one element

6.8.3 Multiple three-phase group (six-phase) machines
1U1   1V1  1W1  2U1   2V1  2W1
1U2   1V2  1W2   2U2   2V2  2W2

Figure 15 – Six-phase winding, open connection, six elements

60034-8 © IEC:2007 – 19 –
6.8.4 DC machines
A1 A2
Figure 16 – Armature winding, one element
B1 B2
B1 B2 B3 B4
Figure 17 – Commutating winding, one and two elements
C1 C2
C1 C2 C3 C4
Figure 18 – Compensating winding, one and two elements
D1 D2
D11   D12
Figure 19 – Series winding, one element, two tappings
E1 E2
Figure 20 – Shunt excitation winding, one element
F2
F1
F1 F2 F3 F4
Figure 21 – Separately excited excitation winding, one and two elements
H1 H2
Figure 22 – Direct-axis auxiliary winding, one element
J1 J2
Figure 23 – Quadrature-axis auxiliary winding, one element

A1 (A2) (B1)       (B2)       (C1)        (C2)  A2

Figure 24 – Armature winding with commutating and
compensating windings, one element

– 20 – 60034-8 © IEC:2007
7 Auxiliary terminal marking rules
7.1 General
The marking of auxiliary terminals shall be according to 6.1.3, with 4.4 identifying the type of
auxiliary device together with:
– a numerical prefix identifying the individual circuit or device;
– a numerical suffix identifying the lead function.
The addition of letters and/or numbers to the auxiliary symbol shall, wherever possible, be
based on the rules given in Clause 6.
When there is a large number of terminals for a given type of device (for example,
thermocouples), the leads may be grouped by device code and the terminals identified by a
prefix (1-99) and followed by a single digit suffix (1-9).
The manufacturer should identify the function of these devices in the written instructions.
When only one device of a certain type exists, the prefix may be omitted.

7.2 Marking
7.2.1 Power-related devices
Devices BA, BD, BW, CA, HE, LA, SC and SP shall be marked and connected in accordance
with 7.2.1.1 to 7.2.1.4 where:
∗∗ indicates the device coding and represents the device.
NOTE This symbol should be changed according to IEC 60617 for schematic diagrams.
7.2.1.1 Single-phase, single voltage

∗∗1 ∗∗2
L1 L2
∗∗1 ∗∗2
Figure 25 – Single-phase, single voltage
7.2.1.2 Single-phase, dual voltage

∗∗2
∗∗1 ∗∗4
Voltage L1 L2 Join Isolate
High ∗∗1 ∗∗4 - ∗∗2
Low -
∗∗1 ∗∗2 [∗∗1, ∗∗4]
Figure 26 – Single-phase dual voltage

60034-8 © IEC:2007 – 21 –
7.2.1.3 Three-phase, single voltage
∗∗U
∗∗U
∗∗W ∗∗V
∗∗W ∗∗V
L1 L2 L3 Connection L1 L2 L3 Connection
Delta Star
∗∗U ∗∗V ∗∗W ∗∗U ∗∗V ∗∗W
Figure 27 – Three-phase, single voltage
7.2.1.4 Three-phase, dual voltage

∗∗U1
∗∗W2 ∗∗U1
∗∗U2
∗∗W2
∗∗V2
∗∗W1 ∗∗U2
∗∗W1
∗∗V1
∗∗V1
∗∗V2
Voltage L1 L2 L3 Join together Connection
Low ∗∗U1 ∗∗V1 ∗∗W1 [∗∗U1, ∗∗W2]; [∗∗V1, ∗∗U2]; [∗∗W1, ∗∗V2] Delta
High Star
∗∗U1 ∗∗V1 ∗∗W1 [∗∗U2, ∗∗V2, ∗∗W2]
Figure 28 – Three-phase dual voltage
7.2.2 Thermal and measurement devices
Devices CT, PT, R, TB, TC, TN, TM and TP shall be marked and connected in accordance
with 7.2.2.1 to 7.2.2.4 where:
∗∗ indicates the device coding and represents the device.
NOTE 1 For TC devices, the leads are colour coded by the manufacturer to denote polarity.
NOTE 2 For resistance thermometers, the last character indicates the circuit number.
NOTE 3 This symbol should be changed according to IEC 60617 for schematic diagrams.
7.2.2.1 Two-lead devices of types TB, TC, TM, TN and TP
1∗∗1 1∗∗2 2∗∗1 2∗∗2
Figure 29 – Two-lead devices (except type R)
L1 and L2 should be connected according to written instructions or lead colour identification.
7.2.2.2 Two-lead devices of type R
1∗∗1 1∗∗2 2∗∗1 2∗∗2
Figure 30 – Two-lead devices of type R

– 22 – 60034-8 © IEC:2007
7.2.2.3 Three-lead devices of type R
1∗∗1 1∗∗2 2∗∗1 2∗∗2
1∗∗2 2∗∗2
Figure 31 – Three-lead devices of type R
7.2.2.4 Four-lead devices of type R
1∗∗1 1∗∗2 2∗∗1 2∗∗2
1∗∗2 2∗∗2
1∗∗1 2∗∗1
Figure 32 – Four-lead devices of type R
7.2.3 Switches
Switches shall be marked and connected as shown in Figure 33 where ∗ denotes the switch
number.
∗S3
∗S1
∗S2
Figure 33 – Switch connections

60034-8 © IEC:2007 – 23 –
Annex A
(normative)
Connection diagrams for common applications

A.1 General
Annex A provides connections for terminal markings that shall be used for common
applications. The layout of figures is for information and may take other forms.
Applications not shown shall be derived from the rules of Clause 6.
NOTE Additions of other common applications may be made to this annex upon request.
A.2 Three-phase machines
A.2.1 Single-speed stator windings
A.2.1.1 Single voltage
U
U
N
W V W V
L1 L2 L3 Connection L1 L2 L3 Connection
U V W Delta U V W Star
Figure A.1 – Delta connection Figure A.2 – Star connection –
with or without neutral
A.2.1.2 Dual voltage
U1
W2 U1
U2
W2 V2
W1
U2
W1 V1
V1
V2
Join Winding
Voltage L1 L2 L3
together connection
Low U1 V1 W1 [U1, W2]; [U2, V1]; [V2, W1] Delta
High U1 V1 W1 [U2, V2, W2] Star
Figure A.3 – Dual voltage, six terminals (1:√3)

– 24 – 60034-8 © IEC:2007
U1
U2
U3 U1
U3
W2
U2
W3 V3
W1
V2 V3
W3
W2 V2
V1
W1 V1
Join Winding
Voltage L1 L2 L3
together connection
Low U1 V
...