IEC 60730-2-13:2025

IEC 60730-2-13 ®
Edition 4.0 2025-08
INTERNATIONAL
STANDARD
EXTENDED VERSION
This full version of IEC 60730-2-13:2025 includes the content of the references made
to IEC 60730-1:2022
Automatic electrical controls -
Part 2-13: Particular requirements for humidity sensing controls
ICS 97.120 ISBN 978-2-8327-0671-8
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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 . 19
3.3 Definitions relating to the function of controls . 22
3.4 Definitions relating to disconnection and interruption . 25
3.5 Definitions of types of control according to construction . 26
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 . 33
3.10 Definitions relating to the connections to controls . 35
3.11 Definitions relating to the performance of type 2 actions . 36
3.12 Definitions relating to the requirements for creepage distances and

clearances . 36
3.13 Miscellaneous definitions . 37
3.14 Definitions relating to manufacturer and user . 39
3.15 Definitions pertaining to thermistors . 39
3.16 Definitions relating to the structure of controls using software . 39
3.17 Definitions relating to error avoidance in controls using software . 39
3.18 Definitions relating to fault/error control techniques for controls using
software . 39
3.19 Definitions relating to memory tests for controls using software . 39
3.20 Definitions of software terminology – General . 39
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 . 40
4 General . 42
4.1 General structure of the document . 42
4.2 General requirements . 43
4.3 General notes on tests . 43
5 Required technical information . 47
5.1 General requirements . 47
5.2 Methods of providing technical information . 47
5.3 Class II symbol . 55
5.4 Additional requirements for marking . 55
5.5 Warning or cautionary markings . 57
6 Protection against electric shock . 57
6.1 General requirements . 57
6.2 Actuating members and actuating means . 59
6.3 Capacitors . 60
6.4 Covers and uninsulated live or hazardous parts . 60
6.5 Battery operated controls provided with a user accessible mains supply input

connector . 60
7 Provision for protective earthing . 61
7.1 Class 0I and Class I controls. 61
7.2 Class II and class III controls . 61
7.3 Adequacy of earth connections . 61
7.4 Corrosion resistance . 62
7.5 Other requirements . 63
7.6 Protective equipotential bonding . 63
8 Terminals and terminations. 63
8.1 Terminals and terminations for external copper conductors . 63
8.2 Terminals and terminations for internal conductors . 68
8.3 Terminals and terminations for integrated conductors . 70
9 Constructional requirements . 70
9.1 Materials . 70
9.2 Protection against electric shock . 70
9.3 Actuation and operation . 73
9.4 Actions . 76
9.5 Openings in enclosures . 78
9.6 Mounting of controls . 78
9.7 Attachment of cords . 80
9.8 Size of cords – non-detachable . 81
9.9 Inlet openings . 81
9.10 Equipment inlets and socket-outlets . 82
9.11 Requirements during mounting, use, maintenance and servicing . 83
9.12 Controls using software . 85
9.13 Protective controls and components of protective control systems . 88
10 Threaded parts and connections . 90
10.1 Threaded parts moved during mounting or servicing . 90
10.2 Current-carrying connections and connections providing protective earthing
continuity . 92
11 Creepage distances, clearances and distances through solid insulation . 93
11.1 General . 93
11.2 Clearances . 94
11.3 Creepage distances . 98
11.4 Solid insulation . 102
12 Components . 103
12.1 Transformers . 103
12.2 Switch mode power supplies and converters . 103
12.3 Capacitors . 104
12.4 Fuses . 104
12.5 Varistors . 104
12.6 Thermistors. 104
12.7 Relays . 105
12.8 Other components . 105
13 Fault assessment on electronic circuits . 105
13.1 Fault assessment for inherent safety . 105
13.2 Fault assessment to ensure functional safety . 111
14 Moisture and dust resistance . 111
14.1 Protection against ingress of water and dust . 111
14.2 Protection against humid conditions . 112
14.3 Touch current test for in-line cord controls and free-standing controls . 113
15 Electric strength and insulation resistance . 114
15.1 Insulation resistance . 114
15.2 Electric strength . 114
15.3 Additional tests for in-line cord and free-standing controls . 116
16 Heating . 117
17 Manufacturing deviation and drift . 122
18 Environmental stress . 122
18.1 Transportation and storage . 122
18.2 Environmental stress of temperature . 122
19 Endurance . 123
19.1 General requirements . 123
19.2 Electrical conditions for the tests . 124
19.3 Thermal conditions for the tests . 130
19.4 Manual and mechanical conditions for the tests . 130
19.5 Dielectric strength requirements. 131
19.6 Ageing test . 131
19.7 Overvoltage test or overload test in all countries using an overload test of
automatic action at accelerated rate . 131
19.8 Test of automatic action at accelerated rate . 132
19.9 Test of automatic action at slow rate . 132
19.10 Overvoltage test or overload test in all countries that use the overload test of
manual action at accelerated speed . 133
19.11 Test of manual action at slow speed . 133
19.12 Test of manual action at high speed which has multiple poles, and where
polarity reversal occurs during the action . 133
19.13 Test of manual action at accelerated speed . 133
19.14 Evaluation of compliance . 134
19.15 Test for particular purpose controls . 134
20 Mechanical strength . 135
20.1 General requirements . 135
20.2 Impact resistance . 135
20.3 Free-standing controls . 136
20.4 In-line cord controls . 136
20.5 Pull-cord actuated controls . 137
20.6 Foot actuated controls . 137
20.7 Actuating member and actuating means . 137
20.8 Flexing – test . 138
20.9 Cord anchorages – test . 138
21 Resistance to heat, fire and tracking . 139
21.1 General requirements . 139
21.2 Integrated, incorporated and in-line cord controls. 139
21.3 Independently mounted, free-standing controls . 141
22 Resistance to corrosion . 141
22.1 Resistance to rusting . 141
23 Electromagnetic compatibility (EMC) requirements – Emission . 141
23.1 General requirement . 141
23.2 High frequency emission . 142
23.3 Low frequency emission . 145
24 Normal operation . 145
25 Electromagnetic compatibility (EMC) requirements – Immunity . 145
25.1 General . 145
25.2 EMC test plan and report . 146
25.3 Immunity requirements . 148
25.4 Performance criteria . 151
25.5 Surge immunity test . 152
25.6 Electrical fast transient immunity test . 152
25.7 Radio-frequency electromagnetic field immunity . 153
25.8 Electrostatic discharge . 153
25.9 Immunity to power-frequency magnetic fields . 153
25.10 Test of the influence of voltage dips and voltage interruption in the power
supply network . 153
26 Abnormal operation tests . 154
26.1 Abnormal temperature test . 154
26.2 Overload tests . 155
26.3 Battery short-circuit test . 156
Annex A (normative) Indelibility of markings . 173
Annex B (normative) Measurement of creepage distances and clearances in air . 175
Annex C (informative) Nominal voltages of supply systems for different modes of
overvoltage control . 179
Annex D (normative) Overvoltage categories . 181
Annex E (informative) Typical usage of controls and related overvoltage categories . 182
Annex F (normative) Pollution degrees . 183
F.1 Pollution . 183
F.2 Degrees of pollution in the micro-environment . 183
Annex G (normative) Resistance to heat, fire and tracking tests . 184
G.1 Glow-wire test . 184
G.2 Proof tracking test . 184
G.3 Ball pressure test . 184
Annex H (normative) Requirements related to functional safety . 186
H.3 Terms and definitions. 186
H.5 Information . 197
H.9 Constructional requirements . 199
H.13 Fault assessment on electronic circuits . 215
H.17 Manufacturing deviation and drift . 219
H.19 Endurance . 221
H.25 Electromagnetic compatibility (EMC) requirements – Immunity. 222
Annex I (normative) Requirements for certain types of DC supplied controls . 239
I.1 Scope . 239
Annex J (normative) Requirements for thermistor elements and controls using
thermistors . 241
J.1 Scope . 241
Annex K (normative) Circuit for measuring touch current . 258
Annex L (normative) Printed circuit board coating performance test . 259
Annex M (normative) Printed circuit board protection . 261
Annex N (informative) Explanatory notes for surge immunity test . 264
N.1 Different source impedances . 264
N.2 Application of the tests. 264
N.3 Installation classification . 265
Annex O (informative) Guidance for applying Clause 11 . 268
Annex P (normative) Requirements for SELV and PELV . 271
P.1 Overview of the requirements for SELV and PELV . 271
P.2 Protection against electric shock by SELV system or PELV system . 271
P.3 Protective measures for SELV system and PELV system . 272
Annex Q (informative) Regional differences relevant for the member countries of
Cenelec . 274
Q.2 Normative references . 274
Annex R (informative) National differences relevant in the United States of America . 278
R.2 Normative references . 278
Annex S (informative) National differences relevant in Japan . 279
S.2 Normative references . 279
Annex T (informative) National differences relevant in Canada . 280
T.2 Normative references . 280
Annex AA (normative) Independently mounted and in-line cord controls . 281
Bibliography . 282

Figure 1 – Example of ports . 40
Figure 2 – Structure of the document with respect to inherent safety and functional
safety . 43
Figure 3 – Example of an electronic circuit with low power points . 106
Figure 4 – Test pin probe 13 of IEC 61032:1997 . 156
Figure 5 – Test finger probe B of IEC 61032:1997 . 157
Figure 6 – Test fingernail . 158
Figure 7 – Impact test for free-standing controls . 159
Figure 8 – Tumbling barrel . 159
Figure 9 – Apparatus for testing durability of markings on rating labels . 160
Figure 10 – Apparatus for flexing test . 160
Figure 11 – Screw terminals and stud terminals . 161
Figure 12 – Pillar terminals . 162
Figure 13 – Mantle terminals . 163
Figure 14 – Saddle and lug terminals . 164
Figure 15 – Tabs. 165
Figure 16 – Tabs for non-reversible connectors . 166
Figure 17 – Receptacles . 167
Figure 18 – Measurement of creepage distance and clearance . 168
Figure 19 – Diagram for touch current measurement at operating temperature for
single-phase connection of class II controls . 169
Figure 20 – Diagram for touch current measurement at operating temperature for
single-phase connection of controls other than class II . 169
Figure 21 – Diagram for touch current measurement at operating temperature for
three-phase connection of class II controls . 170
Figure 22 – Diagram for touch current measurement at operating temperature for
three-phase connection of controls other than class II . 171
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 . 171
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 . 172
Figure B.1 – Narrow groove . 176
Figure B.2 – Wide groove . 176
Figure B.3 – V-shaped groove . 176
Figure B.4 – Rib . 176
Figure B.5 – Uncemented joint with narrow groove . 177
Figure B.6 – Uncemented joint with wide groove . 177
Figure B.7 – Uncemented joint with narrow and wide grooves . 177
Figure B.8 – Diverging side walls . 178
Figure B.9 – Narrow recess . 178
Figure B.10 – Wide recess . 178
Figure B.11 – Conductive floating part . 178
Figure H.1 – V-Model for the software life cycle . 207
Figure H.2 – Voltage variation test . 226
Figure J.1 – Generic test circuit for inrush-current limiting thermistor endurance test . 257
Figure K.1 – Circuit for measuring touch currents . 258
Figure L.1 – Test sample . 260
Figure M.1 – Example of type 1 protection . 262
Figure M.2 – Example of type 2 protection . 263
Figure N.1 – Example of surge protection by shielding in buildings with common earth
reference systems . 266
Figure N.2 – Example of secondary surge protection in buildings with separate
common earth reference systems . 267
Figure N.3 – Example of primary and secondary surge protection of indoor/outdoor
equipment . 267
Figure O.1 – Guidance flowchart for application of requirements of Clause 11 . 269

Table 1 – Required technical information and methods of providing these information . 50
Table 2 – Cross-sectional area of conductors . 64
Table 3 – Terminal conductors . 66
Table 4 – Conductor pull test values . 66
Table 5 – Nominal cross-sectional areas of conductors . 68
Table 6 – Axial force values for tab insertion and withdrawal . 69
Table 7 – Minimum cord conductor sizes . 81
Table 8 – Data exchange . 86
Table 9 – Threaded parts torque test values . 92
Table 10 – Rated impulse voltage for equipment energized directly from the supply
mains (from IEC 60664-1:2007, Table F.1) . 95
Table 11 – Clearances for insulation co-ordination (from IEC 60664-1:2007, Table F.2). 96
Table 12 – Minimum creepage distances for basic insulation . 100
Table 13 – Minimum creepage distances for functional insulation . 101
Table 14 – Electrical/electronic component fault modes . 107
Table 15 – Minimum insulation resistance . 114
Table 16 – Insulation or disconnection test voltages . 115
Table 17 – Maximum heating temperatures . 120
Table 18 – Electrical conditions for the overvoltage and endurance tests . 126
Table 19 – Electrical conditions for the overload tests of 19.7 and 19.10 . 128
Table 20 – Electrical conditions for the endurance tests of 19.8, 19.9, 19.11, 19.12 and
19.13 . 129
Table 21 – Pull-cord force test values . 137
Table 22 – Pull and torque values . 138
Table 23 – Emission limit for residential electromagnetic environment . 143
Table 24 – Emission limit for industrial electromagnetic environment . 144
Table 25 – The applicable EMC test in relation to the class of control function and type
of Action . 146
Table 26 – Immunity test requirements for residential electromagnetic environments . 148
Table 27 – Immunity test requirements for industrial electromagnetic environment . 150
Table 28 – Performance criteria . 152
Table 29 – Maximum winding temperature (for test of mechanical blocked output
conditions) . 155
Table B.1 – Value of X . 175
Table C.1 – Inherent control or equivalent protective control . 179
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 . 180
Table E.1 – Typical usage. 182
Table H.1 – Additional items to Table 1 . 197
a
Table H.2 – Acceptable measures to address fault/errors . 200
Table H.3 – Examples of techniques/measures for semi-formal methods . 207
Table H.4 – Examples of techniques/measures for software architecture specification . 208
Table H.5 – Examples of techniques/measures for module design specification . 209
Table H.6 – Examples of techniques/measures for design and coding standards . 209
Table H.7 – Examples of techniques/measures for software module testing . 210
Table H.8 – Examples of techniques/measures for software integration testing . 211
Table H.9 – Examples of techniques/measures for software safety validation . 211
Table H.10 – Combinations of analytical measures during hardware development . 212
Table H.11 – Examples of defences against unauthorised access and transmission
failure modes . 214
Table H.12 – Applicable test levels in addition to Clause 25. 222
Table H.13 – Voltage dips, short interruptions and voltage variations . 224
Table H.14 – Test values for voltage variations . 225
Table H.15 – Test voltages for test level 2 (depending on the installation class
conditions) . 228
Table H.16 – Test level for electrical fast transient burst test . 230
Table H.17 – Test levels for conducted disturbances on mains and I/O lines . 232
Table H.18 – Test level for immunity to radiated electromagnetic fields . 233
Table H.19 – Increased test level for radiated immunity . 234
Table H.20 – Test level for supply frequency variations . 235
Table H.21 – Test level for continuous fields . 236
Table I.1 – Electrical transient conduction immunity in accordance with ISO 7637-2 . 239
Table I.2 – Electrical transient conduction immunity in accordance with ISO 7637-3 . 240
Table J.1 – Maximum current . 243
Table J.2 – Normal operating conditions . 244
Table J.3 – Samples for the test (clause reference) . 245
Table J.4 – Electrical and thermal ratings of a thermistor . 246
Table J.5 – Additional items to Table 1 . 247
Table J.6 – Sequence of calibration and conditioning tests for PTC thermistors . 249
Table J.7 – Classes for PTC sensing thermistors . 250
Table J.8 – Sequence of calibration and conditioning tests for NTC thermistors . 251
Table J.9 – Classes for NTC sensing thermistors . 251
Table J.10 – Number of cycles for endurance test . 255
Table J.11 – Ageing test temperature . 255
Table J.12 – Number of cycles for endurance test . 256
Table L.1 – Environmental cycling conditions . 259
Table M.1 – IEC 60664-3 test levels or conditions . 261
Table O.1 – Example A – Using Annex O guidance for applying Clause 11 . 270
Table O.2 – Example B – Using Annex O guidance for applying Clause 11 . 270
Table Q.1 – Additional aging parameters for windings . 275
Table AA.1 – Number of cycles . 281

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Automatic electrical controls -
Part 2-13: Particular requirements for humidity sensing controls

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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