IEC 60730-2-6:2025

IEC 60730-2-6 ®
Edition 4.0 2025-08
INTERNATIONAL
STANDARD
EXTENDED VERSION
This full version of IEC 60730-2-6:2025 includes the content of the references made to
IEC 60730-1:2022
Automatic electrical controls -
Part 2-6: Particular requirements for automatic electrical pressure sensing
controls including mechanical requirements
ICS 97.120 ISBN 978-2-8327-0661-9
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or
by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either
IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC copyright
or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local
IEC member National Committee for further information.

IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Discover our powerful search engine and read freely all the
The advanced search enables to find IEC publications by a publications previews, graphical symbols and the glossary.
variety of criteria (reference number, text, technical With a subscription you will always have access to up to date
committee, …). It also gives information on projects, content tailored to your needs.
replaced and withdrawn publications.
Electropedia - www.electropedia.org
The world's leading online dictionary on electrotechnology,
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published containing more than 22 500 terminological entries in English
details all new publications released. Available online and and French, with equivalent terms in 25 additional languages.
once a month by email. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer
Service Centre: sales@iec.ch.
CONTENTS
FOREWORD . 9
1 Scope . 12
2 Normative references . 13
3 Terms and definitions . 17
3.1 Definitions relating to ratings, voltages, currents, frequencies, and wattages . 17
3.2 Definitions of types of control according to purpose . 20
3.3 Definitions relating to the function of controls . 22
3.4 Definitions relating to disconnection and interruption . 26
3.5 Definitions of types of control according to construction . 27
3.6 Definitions of type of automatic action of a control . 28
3.7 Definitions relating to protection against electric shock and type of insulation . 28
3.8 Definitions relating to component parts of controls . 32
3.9 Definitions of types of terminals and terminations of controls . 34
3.10 Definitions relating to the connections to controls . 36
3.11 Definitions relating to the performance of type 2 actions . 37
3.12 Definitions relating to the requirements for creepage distances and

clearances . 37
3.13 Miscellaneous definitions . 38
3.14 Definitions relating to manufacturer and user . 40
3.15 Definitions pertaining to thermistors . 40
3.16 Definitions relating to the structure of controls using software . 40
3.17 Definitions relating to error avoidance in controls using software . 40
3.18 Definitions relating to fault/error control techniques for controls using
software . 40
3.19 Definitions relating to memory tests for controls using software . 40
3.20 Definitions of software terminology – General . 40
3.21 Definitions relating to classes of control functions . 40
3.22 Definitions relating to functional safety . 40
3.23 Definitions related to access to data exchange . 40
3.24 Definitions related to EMC performance . 41
4 General . 43
4.1 General structure of the document . 43
4.2 General requirements . 44
4.3 General notes on tests . 44
5 Required technical information . 48
5.1 General requirements . 48
5.2 Methods of providing technical information . 48
5.3 Class II symbol . 56
5.4 Additional requirements for marking . 56
5.5 Warning or cautionary markings . 58
6 Protection against electric shock . 58
6.1 General requirements . 58
6.2 Actuating members and actuating means . 60
6.3 Capacitors . 61
6.4 Covers and uninsulated live or hazardous parts . 61
6.5 Battery operated controls provided with a user accessible mains supply input

connector . 61
7 Provision for protective earthing . 62
7.1 Class 0I and Class I controls. 62
7.2 Class II and class III controls . 62
7.3 Adequacy of earth connections . 62
7.4 Corrosion resistance . 63
7.5 Other requirements . 64
7.6 Protective equipotential bonding . 64
8 Terminals and terminations. 64
8.1 Terminals and terminations for external copper conductors . 64
8.2 Terminals and terminations for internal conductors . 69
8.3 Terminals and terminations for integrated conductors . 71
9 Constructional requirements . 71
9.1 Materials . 71
9.2 Protection against electric shock . 71
9.3 Actuation and operation . 74
9.4 Actions . 77
9.5 Openings in enclosures . 80
9.6 Mounting of controls . 80
9.7 Attachment of cords . 81
9.8 Size of cords – non-detachable . 82
9.9 Inlet openings . 83
9.10 Equipment inlets and socket-outlets . 83
9.11 Requirements during mounting, use, maintenance and servicing . 84
9.12 Controls using software . 87
9.13 Protective controls and components of protective control systems . 90
9.101 Construction requirements relating to operating mechanism . 92
9.102 A pressure cut-out shall not reset or be resettable manually or otherwise at a
value above the maximum or below the minimum operating pressure,
whichever is declared. . 93
9.103 A pressure cut-out with a manually operated reset device shall be trip-free. . 93
10 Threaded parts and connections . 93
10.1 Threaded parts moved during mounting or servicing . 93
10.2 Current-carrying connections and connections providing protective earthing
continuity . 95
11 Creepage distances, clearances and distances through solid insulation . 96
11.1 General . 96
11.2 Clearances . 97
11.3 Creepage distances . 101
11.4 Solid insulation . 105
12 Components . 106
12.1 Transformers . 106
12.2 Switch mode power supplies and converters . 106
12.3 Capacitors . 107
12.4 Fuses . 107
12.5 Varistors . 107
12.6 Thermistors. 107
12.7 Relays . 108
12.8 Other components . 108
13 Fault assessment on electronic circuits . 108
13.1 Fault assessment for inherent safety . 108
13.2 Fault assessment to ensure functional safety . 114
14 Moisture and dust resistance . 114
14.1 Protection against ingress of water and dust . 114
14.2 Protection against humid conditions . 115
14.3 Touch current test for in-line cord controls and free-standing controls . 116
15 Electric strength and insulation resistance . 117
15.1 Insulation resistance . 117
15.2 Electric strength . 117
15.3 Additional tests for in-line cord and free-standing controls . 119
16 Heating . 120
17 Manufacturing deviation and drift . 124
18 Environmental stress . 124
18.1 Transportation and storage . 124
18.2 Environmental stress of temperature . 124
19 Endurance . 125
19.1 General requirements . 125
19.2 Electrical conditions for the tests . 126
19.3 Thermal conditions for the tests . 132
19.4 Manual and mechanical conditions for the tests . 132
19.5 Dielectric strength requirements. 133
19.6 Ageing test . 133
19.7 Overvoltage test or overload test in all countries using an overload test of
automatic action at accelerated rate . 133
19.8 Test of automatic action at accelerated rate . 134
19.9 Test of automatic action at slow rate . 134
19.10 Overvoltage test or overload test in all countries that use the overload test of
manual action at accelerated speed . 135
19.11 Test of manual action at slow speed . 135
19.12 Test of manual action at high speed which has multiple poles, and where
polarity reversal occurs during the action . 135
19.13 Test of manual action at accelerated speed . 135
19.14 Evaluation of compliance . 136
19.15 Test for particular purpose controls . 136
20 Mechanical strength . 137
20.1 General requirements . 137
20.2 Impact resistance . 138
20.3 Free-standing controls . 138
20.4 In-line cord controls . 139
20.5 Pull-cord actuated controls . 139
20.6 Foot actuated controls . 139
20.7 Actuating member and actuating means . 140
20.8 Flexing – test . 140
20.9 Cord anchorages – test . 141
20.101 Medium leakage . 141
20.102 Strength of parts (hydrostatic) . 142
21 Resistance to heat, fire and tracking . 143
21.1 General requirements . 143
21.2 Integrated, incorporated and in-line cord controls. 143
21.3 Independently mounted, free-standing controls . 144
22 Resistance to corrosion . 145
22.1 Resistance to rusting . 145
23 Electromagnetic compatibility (EMC) requirements – Emission . 145
23.1 General requirement . 145
23.2 High frequency emission . 145
23.3 Low frequency emission . 149
24 Normal operation . 149
25 Electromagnetic compatibility (EMC) requirements – Immunity . 149
25.1 General . 149
25.2 EMC test plan and report . 150
25.3 Immunity requirements . 152
25.4 Performance criteria . 155
25.5 Surge immunity test . 156
25.6 Electrical fast transient immunity test . 156
25.7 Radio-frequency electromagnetic field immunity . 157
25.8 Electrostatic discharge . 157
25.9 Immunity to power-frequency magnetic fields . 157
25.10 Test of the influence of voltage dips and voltage interruption in the power
supply network . 157
26 Abnormal operation tests . 158
26.1 Abnormal temperature test . 158
26.2 Overload tests . 159
26.3 Battery short-circuit test . 160
Annex A (normative) Indelibility of markings . 177
Annex B (normative) Measurement of creepage distances and clearances in air . 179
Annex C (informative) Nominal voltages of supply systems for different modes of
overvoltage control . 183
Annex D (normative) Overvoltage categories . 185
Annex E (informative) Typical usage of controls and related overvoltage categories . 186
Annex F (normative) Pollution degrees . 187
F.1 Pollution . 187
F.2 Degrees of pollution in the micro-environment . 187
Annex G (normative) Resistance to heat, fire and tracking tests . 188
G.1 Glow-wire test . 188
G.2 Proof tracking test . 188
G.3 Ball pressure test . 188
Annex H (normative) Requirements related to functional safety . 190
H.3 Terms and definitions. 190
H.5 Information . 201
H.9 Constructional requirements . 203
H.13 Fault assessment on electronic circuits . 219
H.17 Manufacturing deviation and drift . 223
H.19 Endurance . 225
H.25 Electromagnetic compatibility (EMC) requirements – Immunity. 226
Annex I (normative) Requirements for certain types of DC supplied controls . 244
I.1 Scope . 244
Annex J (normative) Requirements for thermistor elements and controls using
thermistors. 246
J.1 Scope . 246
Annex K (normative) Circuit for measuring touch current . 263
Annex L (normative) Printed circuit board coating performance test . 264
Annex M (normative) Printed circuit board protection . 266
Annex N (informative) Explanatory notes for surge immunity test . 269
N.1 Different source impedances . 269
N.2 Application of the tests. 269
N.3 Installation classification . 270
Annex O (informative) Guidance for applying Clause 11 . 273
Annex P (normative) Requirements for SELV and PELV . 276
P.1 Overview of the requirements for SELV and PELV . 276
P.2 Protection against electric shock by SELV system or PELV system . 276
P.3 Protective measures for SELV system and PELV system . 277
Annex Q (informative) Regional differences relevant for the member countries of
Cenelec . 279
Annex R (informative) National differences relevant in the United States of America . 283
R.2 Normative references . 283
Annex S (informative) National differences relevant in Japan . 284
S.2 Normative references . 284
Annex T (informative) National differences relevant in Canada . 285
T.2 Normative references . 285
Annex AA (normative) Number of cycles . 286
AA.1 Number of cycles for independently mounted controls . 286
AA.2 Cycling rate for independently mounted controls . 286
Annex BB (informative) Stainless steel for bellows, bourdon tubes or similar elements . 287
Bibliography . 290

Figure 1 – Example of ports . 41
Figure 2 – Structure of the document with respect to inherent safety and functional
safety . 44
Figure 3 – Example of an electronic circuit with low power points . 109
Figure 4 – Test pin probe 13 of IEC 61032:1997 . 160
Figure 5 – Test finger probe B of IEC 61032:1997 . 161
Figure 6 – Test fingernail . 162
Figure 7 – Impact test for free-standing controls . 163
Figure 8 – Tumbling barrel . 163
Figure 9 – Apparatus for testing durability of markings on rating labels . 164
Figure 10 – Apparatus for flexing test . 164
Figure 11 – Screw terminals and stud terminals . 165
Figure 12 – Pillar terminals . 166
Figure 13 – Mantle terminals . 167
Figure 14 – Saddle and lug terminals . 168
Figure 15 – Tabs. 169
Figure 16 – Tabs for non-reversible connectors . 170
Figure 17 – Receptacles . 171
Figure 18 – Measurement of creepage distance and clearance . 172
Figure 19 – Diagram for touch current measurement at operating temperature for
single-phase connection of class II controls . 173
Figure 20 – Diagram for touch current measurement at operating temperature for
single-phase connection of controls other than class II . 173
Figure 21 – Diagram for touch current measurement at operating temperature for
three-phase connection of class II controls . 174
Figure 22 – Diagram for touch current measurement at operating temperature for
three-phase connection of controls other than class II . 175
Figure 23 – Diagram for touch current measurement at operating temperature for
single-phase connection of controls to three-wire, ground neutral supply other than
class II . 175
Figure 24 – Diagram for touch current measurement at operating temperature for
two‑phase connection of controls to three-wire, ground neutral supply other
than class II . 176
Figure B.1 – Narrow groove . 180
Figure B.2 – Wide groove . 180
Figure B.3 – V-shaped groove . 180
Figure B.4 – Rib . 180
Figure B.5 – Uncemented joint with narrow groove . 181
Figure B.6 – Uncemented joint with wide groove . 181
Figure B.7 – Uncemented joint with narrow and wide grooves . 181
Figure B.8 – Diverging side walls . 182
Figure B.9 – Narrow recess . 182
Figure B.10 – Wide recess . 182
Figure B.11 – Conductive floating part . 182
Figure H.1 – V-Model for the software life cycle . 211
Figure H.2 – Voltage variation test . 230
Figure J.1 – Generic test circuit for inrush-current limiting thermistor endurance test . 262
Figure K.1 – Circuit for measuring touch currents . 263
Figure L.1 – Test sample . 265
Figure M.1 – Example of type 1 protection . 267
Figure M.2 – Example of type 2 protection . 268
Figure N.1 – Example of surge protection by shielding in buildings with common earth
reference systems . 271
Figure N.2 – Example of secondary surge protection in buildings with separate
common earth reference systems . 272
Figure N.3 – Example of primary and secondary surge protection of indoor/outdoor
equipment . 272
Figure O.1 – Guidance flowchart for application of requirements of Clause 11 . 274

Table 1 – Required technical information and methods of providing these information . 51
Table 2 – Cross-sectional area of conductors . 65
Table 3 – Terminal conductors . 67
Table 4 – Conductor pull test values . 67
Table 5 – Nominal cross-sectional areas of conductors . 69
Table 6 – Axial force values for tab insertion and withdrawal . 70
Table 7 – Minimum cord conductor sizes . 82
Table 8 – Data exchange . 89
Table 9 – Threaded parts torque test values . 95
Table 10 – Rated impulse voltage for equipment energized directly from the supply
mains (from IEC 60664-1:2007, Table F.1) . 98
Table 11 – Clearances for insulation co-ordination (from IEC 60664-1:2007, Table F.2). 99
Table 12 – Minimum creepage distances for basic insulation . 103
Table 13 – Minimum creepage distances for functional insulation . 104
Table 14 – Electrical/electronic component fault modes . 110
Table 15 – Minimum insulation resistance . 117
Table 16 – Insulation or disconnection test voltages . 118
Table 17 – Maximum heating temperatures . 122
Table 18 – Electrical conditions for the overvoltage and endurance tests . 128
Table 19 – Electrical conditions for the overload tests of 19.7 and 19.10 . 130
Table 20 – Electrical conditions for the endurance tests of 19.8, 19.9, 19.11, 19.12 and
19.13 . 131
Table 21 – Pull-cord force test values . 139
Table 22 – Pull and torque values . 141
Table 23 – Emission limit for residential electromagnetic environment . 147
Table 24 – Emission limit for industrial electromagnetic environment . 148
Table 25 – The applicable EMC test in relation to the class of control function and type
of Action . 150
Table 26 – Immunity test requirements for residential electromagnetic environments . 152
Table 27 – Immunity test requirements for industrial electromagnetic environment . 154
Table 28 – Performance criteria . 156
Table 29 – Maximum winding temperature (for test of mechanical blocked output
conditions) . 159
Table B.1 – Value of X . 179
Table C.1 – Inherent control or equivalent protective control . 183
Table C.2 – Cases where protective control is necessary and control is provided by
surge arresters having a ratio of clamping voltage to rated voltage not smaller than
that specified by IEC 60099-1 . 184
Table E.1 – Typical usage. 186
Table H.1 – Additional items to Table 1 . 201
a
Table H.2 – Acceptable measures to address fault/errors . 204
Table H.3 – Examples of techniques/measures for semi-formal methods . 211
Table H.4 – Examples of techniques/measures for software architecture specification . 212
Table H.5 – Examples of techniques/measures for module design specification . 213
Table H.6 – Examples of techniques/measures for design and coding standards . 213
Table H.7 – Examples of techniques/measures for software module testing . 214
Table H.8 – Examples of techniques/measures for software integration testing . 215
Table H.9 – Examples of techniques/measures for software safety validation . 215
Table H.10 – Combinations of analytical measures during hardware development . 216
Table H.11 – Examples of defences against unauthorised access and transmission
failure modes . 218
Table H.12 – Applicable test levels in addition to Clause 25. 227
Table H.13 – Voltage dips, short interruptions and voltage variations . 229
Table H.14 – Test values for voltage variations . 230
Table H.15 – Test voltages for test level 2 (depending on the installation class
conditions) . 233
Table H.16 – Test level for electrical fast transient burst test . 235
Table H.17 – Test levels for conducted disturbances on mains and I/O lines . 237
Table H.18 – Test level for immunity to radiated electromagnetic fields . 238
Table H.19 – Increased test level for radiated immunity . 239
Table H.20 – Test level for supply frequency variations . 240
Table H.21 – Test level for continuous fields . 242
Table I.1 – Electrical transient conduction immunity in accordance with ISO 7637-2 . 244
Table I.2 – Electrical transient conduction immunity in accordance with ISO 7637-3 . 245
Table J.1 – Maximum current . 248
Table J.2 – Normal operating conditions . 249
Table J.3 – Samples for the test (clause reference) . 250
Table J.4 – Electrical and thermal ratings of a thermistor . 251
Table J.5 – Additional items to Table 1 . 252
Table J.6 – Sequence of calibration and conditioning tests for PTC thermistors . 254
Table J.7 – Classes for PTC sensing thermistors . 255
Table J.8 – Sequence of calibration and conditioning tests for NTC thermistors . 256
Table J.9 – Classes for NTC sensing thermistors . 256
Table J.10 – Number of cycles for endurance test . 260
Table J.11 – Ageing test temperature . 260
Table J.12 – Number of cycles for endurance test . 261
Table L.1 – Environmental cycling conditions . 264
Table M.1 – IEC 60664-3 test levels or conditions . 266
Table O.1 – Example A – Using Annex O guidance for applying Clause 11 . 275
Table O.2 – Example B – Using Annex O guidance for applying Clause 11 . 275
Table Q.1 – Additional aging parameters for windings .
...