IEC 61010-2-201:2013

Safety requirements for electrical equipment for measurement, control and laboratory use - Part 2-201: Particular requirements for control equipment

IEC 61010-2-201:2013 specifies the complete safety requirements for control equipment (e.g. programmable controller (PLC)), the components of Distributed Control Systems, I/O devices, Human Machine Interface (HMI)). Safety terms of general use are defined in IEC 61010-1. More specific terms are defined in each part. This part incorporates the safety related requirements of Programmable Controllers. Annex DD provides a cross reference between clauses of this standard and those of IEC 61010-1 or IEC 61131-2:2007. It has the status of a basic safety publication in accordance with IEC Guide 104.
This publication is to be read in conjunction with IEC 61010-1:2010.

Règles de sécurité pour appareils électriques de mesurage, de régulation et de laboratoire - Partie 2-201: Exigences particulières pour les équipements de commande

La CEI 60101-2-201:2013 spécifie l'ensemble des exigences de sécurité relatives aux équipements de commande (par exemple les automates programmables (AP)), aux composants des systèmes à commande distribuée, aux appareils d'E/S et à l'interface homme/machine. Les termes de sécurité d'usage général sont définis dans la CEI 61010-1. Des termes plus spécifiques sont définis dans chaque partie. Cette partie contient les exigences relatives à la sécurité des automates programmables. L'Annexe DD établit une référence croisée entre les articles de la présente norme et ceux de la CEI 61010-1 ou de la CEI 61131-2:2007. Elle a le statut d'une publication fondamentale de sécurité conformément au Guide CEI 104.
Cette publication doit être lue conjointement avec la CEI 61010-1:2010.

General Information

• Status: Published
• Publication Date: 24-Feb-2013
• ICS: 13.110 - Safety of machinery
• ICS: 17.020 - Metrology and measurement in general
• ICS: 19.020 - Test conditions and procedures in general
• Technical Committee: TC 65 - Industrial-process measurement, control and automation
• Drafting Committee: JWG 13 - TC 65/JWG 13
• Current Stage: DELPUB - Deleted Publication
• Start Date: 24-Mar-2017
• Completion Date: 26-Oct-2025

Relations

• Revised: IEC 61010-2-201:2017 - Safety requirements for electrical equipment for measurement, control, and laboratory use - Part 2-201: Particular requirements for control equipment
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61010-2-201 ®
Edition 1.0 2013-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Safety requirements for electrical equipment for measurement, control, and
laboratory use –
Part 2-201: Particular requirements for control equipment

Règles de sécurité pour appareils électriques de mesurage, de régulation et de
laboratoire –
Partie 2-201: Exigences particulières pour les équipements de commande

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IEC 61010-2-201 ®
Edition 1.0 2013-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ

Safety requirements for electrical equipment for measurement, control, and

laboratory use –
Part 2-201: Particular requirements for control equipment

Règles de sécurité pour appareils électriques de mesurage, de régulation et de

laboratoire –
Partie 2-201: Exigences particulières pour les équipements de commande

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XA
ICS 13.110; 17.020; 19.020; 25.040.40 ISBN 978-2-83220-588-4

– 2 – 61010-2-201 © IEC:2013
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope and object . 8
1.1.1 Equipment included in scope . 8
1.1.2 Equipment excluded from scope . 9
1.2.1 Aspects included in scope . 9
1.2.2 Aspects excluded from scope . 9
2 Normative references . 10
3 Terms and definitions . 10
4 Tests . 12
4.1 General . 12
4.3.2 State of equipment . 12
4.4 Testing in single fault condition . 12
5 Marking and documentation . 14
5.4.3 Equipment installation . 14
6 Protection against electric shock . 14
6.1.2 Exceptions . 14
6.2.1 General . 14
6.2.2 Examination . 14
6.2.3 Openings above parts that are hazardous live . 14
6.2.4 Openings for pre-set controls . 15
6.2.101 Accessibility of interfaces/ports/terminals . 15
6.2.102 Control equipment . 17
6.6.1 General . 20
6.6.2 Terminals for external circuits . 20
6.6.3 Circuits with terminals which are hazardous live . 20
6.6.4 Terminals for stranded conductors . 20
6.7.2 Insulation for mains circuits of overvoltage category II with a nominal
supply voltage up to 300 V . 22
6.7.3 Insulation for secondary circuits derived from mains circuits of
overvoltage category II up to 300 V . 24
6.7.101 Insulation for field wiring terminals of overvoltage category II with a
nominal voltage up to 1 000 V . 26
6.8.3 Test procedures . 26
6.10 Connection to the mains supply source and connections between parts of
equipment . 26
6.11 Disconnection from supply source . 27
7 Protection against mechanical hazards . 27
7.1.101 Open and panel mounted equipment . 27
7.2 Sharp edges . 27
7.3.3 Risk assessment for mechanical hazards to body parts . 27
7.3.4 Limitation of force and pressure. 28
7.3.5 Gap limitations between moving parts . 28
7.7 Expelled parts . 28
8 Resistance to mechanical stresses . 28
8.1.101 Open equipment . 28

61010-2-201 © IEC:2013 – 3 –
8.1.102 Panel mounted equipment . 28
8.2.2 Impact test . 28
8.3 Drop test . 28
8.3.1 Equipment other than hand-held equipment and direct plug-in
equipment . 29
8.3.2 Hand-held equipment and direct plug-in equipment . 29
9 Protection against the spread of fire . 29
9.2 Eliminating or reducing the sources of ignition within the equipment . 29
9.3.2 Constructional requirements . 29
10 Equipment temperature limits and resistance to heat . 30
10.1 Surface temperature limits for protection against burns . 30
10.3 Other temperature measurements . 31
10.4.1 General . 31
10.4.2 Temperature measurement of heating equipment . 32
10.4.3 Equipment intended for installation in a cabinet or a wall . 32
10.5.2 Non-metallic enclosures . 33
11 Protection against hazards from fluids . 33
11.6 Specially protected equipment . 33
12 Protection against radiation, including laser sources, and against sonic and
ultrasonic pressure . 33
13 Protection against liberated gases and substances, explosion and implosion . 34
13.1 Poisonous and injurious gases and substances . 34
13.2.1 Components . 34
13.2.2 Batteries and battery charging . 34
14 Components and subassemblies . 34
14.101 Components bridging insulation . 34
14.101.1 Capacitors . 34
14.101.2 Surge surpressors . 34
14.102 Switching devices . 35
15 Protection by interlocks . 35
16 Hazards resulting from application . 35
17 Risk assessment . 35
Annexes . 35
Annex F (normative) Routine tests . 36
Annex L (informative) Index of defined terms . 38
Annex AA (informative) General approach to safety for control equipment . 39
Annex BB (informative) System drawing of isolation boundaries . 41
Annex CC (informative) Historical techniques for secondary circuits . 49
Annex DD (informative) Cross references between IEC 61010-2-201 and IEC 61010-
1:2010 or IEC 61131-2:2007 . 53
Bibliography . 54

Figure 101 – Typical interface/port diagram of control equipment. 16
Figure 102 – Requirements for insulation between separate circuits and between
circuits and accessible conductive parts . 21
Figure 103 – Mechanical hazards requirements for panel mounted equipment . 27
Figure 104 – Safety enclosure with HMI installed through a wall . 30

– 4 – 61010-2-201 © IEC:2013
Figure 105 – Panel mounted HMI device extending through the wall of a cabinet . 33
Figure AA.1 – Control equipment access and safety concerns . 39
Figure BB.1 – Typical system enclosure layout . 42
Figure BB.2 – Simplified system schematic . 43
Figure BB.3 – Hazard situation of the control equipment . 44
Figure BB.4 – Application of the standard to the control equipment safety drawing . 45
Figure BB.5 – Reinforced insulation . 46
Figure BB.6 – Basic insulation . 47
Figure BB.7 – Reinforced insulation, basic insulation and limiting impedance . 48

Table 101 – Overload test circuit values . 13
Table 102 – Endurance test circuit values . 13
Table 103 – Operator accessibility for open and enclosed equipment . 16
Table 4 – Clearance and creepage distances for mains circuits of overvoltage category
II up to 300 V . 23
Table 5 – Test voltages for solid insulation between mains and between mains and
d
secondary circuits overvoltage category II up to 300 V . 24
Table 6 – Clearances and test voltages for secondary circuits derived from mains
circuits of overvoltage category II up to 300 V . 25
Table 104 – Minimum creepages and clearances in air of overvoltage category II up to
1 000 V at field-wiring terminals . 26
Table 105 – Drop tests . 29
Table 19 – Surface temperature limits, under normal conditions . 31
Table CC.1 – Limits of output current and output power for inherently limited power
sources . 51
Table CC.2 – Limits of output current, output power and ratings for over-current
protective devices for non-inherently limited power sources . 52
Table DD.1 – Cross-references between IEC 61010-2-201 and IEC 61010-1 or
IEC 61131-2 . 53

61010-2-201 © IEC:2013 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY REQUIREMENTS FOR ELECTRICAL EQUIPMENT
FOR MEASUREMENT, CONTROL, AND LABORATORY USE –

Part 2-201: Particular requirements for control equipment

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
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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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 61010-2-201 has been prepared by IEC technical committee 65:
Industrial-process measurement, control and automation.
The text of this standard is based on the following documents:
FDIS Report on voting
65/515/FDIS 65/521/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 Part 2-201 is intended to be used in conjunction with IEC 61010-1. It was established on
the basis of the third edition (2010). Consideration may be given to future editions of, or
amendments to, IEC 61010-1.
– 6 – 61010-2-201 © IEC:2013
This Part 2-201 supplements or modifies the corresponding clauses in IEC 61010-1 so as to
convert that publication into the IEC standard: Particular requirements for control equipment.
Where a particular subclause of Part 1 is not mentioned in this part 2, that subclause applies
as far as is reasonable. Where this part states “addition”, “modification”, “replacement”, or
“deletion”, the relevant requirement, test specification or note in Part 1 should be adapted
accordingly.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
It has the status of a basic safety publication in accordance with IEC Guide 104.
A list of all parts in the IEC 61010 series, published under the general title Safety
requirements for electrical equipment for measurement, control and laboratory use, can be
found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability 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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
61010-2-201 © IEC:2013 – 7 –
INTRODUCTION
This IEC 61010-2-201 document constitutes Part 2-201 of a planned series of standards on
industrial-process measurement, control and automation equipment.
This part specifies the complete safety requirements for control equipment (e.g.
programmable controller (PLC)), the components of Distributed Control Systems, I/O devices,
Human Machine Interface (HMI)).
Safety terms of general use are defined in IEC 61010-1. More specific terms are defined in
each part.
This part incorporates the safety related requirements of Programmable Controllers.
Annex DD provides a cross reference between clauses of this standard and those of
IEC 61010-1 or IEC 61131-2:2007.

– 8 – 61010-2-201 © IEC:2013
SAFETY REQUIREMENTS FOR ELECTRICAL EQUIPMENT
FOR MEASUREMENT, CONTROL, AND LABORATORY USE –

Part 2-201: Particular requirements for control equipment

1 Scope and object
This clause of Part 1 is applicable, except as follows.
1.1.1 Equipment included in scope
Replacement:
This part of IEC 61010 specifies safety requirements and related verification tests for control
equipment of the following types:
– Programmable controllers (PLC and PAC);
– the components of Distributed Control Systems (DCS);
– the components of remote I/O – systems;
– industrial PC (computers) and Programming and Debugging Tools (PADTs);
– Human-Machine Interfaces (HMI);
– any product performing the function of control equipment and/or their associated
peripherals,
which have as their intended use the control and command of machines, automated
manufacturing and industrial processes, e.g. discrete and continuous control.
Components of the above named equipment and in the scope of this standard are:
– (auxiliary) stand-alone power supplies;
– peripherals such as digital and analogue I/O, remote-I/O;
– industrial network equipment.
Control equipment and their associated peripherals are intended to be used in an industrial
environment and may be provided as open or enclosed equipment.
NOTE 1 Control equipment intended also for use in other environments or for other purposes (example; for use in
building installations to control light or other electrical installations, or for use on cars, trains or ships) can have
additional conformity requirements defined by the safety standard(s) for these applications. These requirements
can involve as example: insulation, spacings and power restrictions.
NOTE 2 Computing devices and similar equipment within the scope of IEC 60950 (planned to be replaced by
IEC 62368) and conforming to its requirements are considered to be suitable for use with control equipment within
the scope of this standard. However, some of the requirements of IEC 60950 for resistance to moisture and liquids
are less stringent than those in IEC 61010-1:2010, 5.4.4 second paragraph.
Control equipment covered in this standard is intended for use in overvoltage category II
(IEC 60664-1) in low-voltage installations, where the rated equipment supply voltage does not
exceed a.c. 1 000 V r.m.s. (50/60 Hz), or d.c. 1 500 V.
NOTE 3 If equipment in the scope of this part is applied to overvoltage category III and IV installations, then the
requirements of Annex K of Part 1 apply.
The requirements of ISO/IEC Guide 51 and IEC Guide 104, as they relate to this Part, are
incorporated herein.
61010-2-201 © IEC:2013 – 9 –
1.1.2 Equipment excluded from scope
Replacement:
This standard does not deal with aspects of the overall automated system, e.g. a complete
assembly line. Control equipment (e.g. DCS and PLC), their application program and their
associated peripherals are considered as components (components in this context are items
which perform no useful function by themselves) of an overall automated system.
Since control equipment (e.g. DCS and PLC) are component devices, safety considerations
for the overall automated system including installation and application are beyond the scope
of this standard. Refer to IEC 60364 series of standards or applicable national/local
regulations for electrical installation and guidelines.
1.2.1 Aspects included in scope
Replacement:
The purpose of the requirements of this standard is to ensure that all hazards to the operator,
service personnel and the surrounding area are reduced to a tolerable level.
NOTE By using the terms "operator" and "service personnel" this standard considers the perception of hazards
depending on training and skills. Annex AA gives a general approach in this regard.
Requirements for protection against particular types of hazard are given in Clauses 6 to 13,
as follows:
a) electric shock or burn (see Clause 6);
b) mechanical hazards (see Clauses 7 and 8);
c) spread of fire from the control equipment (see Clause 9);
d) excessive temperature (see Clause 10);
e) effects of fluids and fluid pressure (see Clause 11);
f) effects of radiation, including lasers sources, and sonic and ultrasonic pressure (see
Clause 12);
g) liberated gases, explosion and implosion (see Clause 13);
Requirements for protection against hazards arising from reasonably foreseeable misuse and
ergonomic factors are specified in Clause 16.
Risk assessment for hazards or environments not fully covered above is specified in Clause
17.
NOTE Attention is drawn to the existence of additional requirements regarding the health and safety of labour
forces.
1.2.2 Aspects excluded from scope
Replacement:
This standard does not cover:
a) reliability, functionality, performance, or other properties of the control equipment not
related to safety;
b) mechanical or climatic requirements for operation, transport or storage;
c) EMC requirements (See e.g. IEC 61326 or IEC 61131-2);
d) protective measures for explosive atmospheres (See e.g. IEC 60079 series);
e) functional safety (See e.g. IEC 61508 or IEC 61131-6).

– 10 – 61010-2-201 © IEC:2013
2 Normative references
This clause of Part 1 is applicable, except as follows:
Addition of the following references to the list:
IEC 60068-2-31:2008, Environmental testing – Part 2-31: Tests – Test Ec: Rough handling
shocks, primarily for equipment-type specimens
IEC 60384-14:2005, Fixed capacitors for use in electronic equipment – Part 14: Sectional
specification: Fixed capacitors for electromagnetic interference suppression and connection to
the supply mains
IEC 60664-1:2007, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests
IEC 60695-2-11:2000, Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods –
Glow-wire flammability test method for end-products
IEC 60947-5-1:2003, Low-voltage switchgear and controlgear – Part 5-1: Control circuit
devices and switching elements – Electromechanical control circuit devices
IEC 60947-7-1:2009, Low-voltage switchgear and controlgear – Part 7-1: Ancillary equipment
– Terminal blocks for copper conductors
IEC 61010-1:2010, Safety requirements for electrical equipment for measurement, control,
and laboratory use – Part 1: General requirements
IEC 61010-2-030, Safety requirements for electrical equipment for measurement, control, and
laboratory use – Part 2-030: Particular requirements for testing and measuring circuits
IEC 61051-2:1991, Varistors for use in electronic equipment – Part 2: Sectional specification
for surge suppression varistors
3 Terms and definitions
This clause of Part 1 is applicable, except as follows:
Additional terms and definitions:
3.101
enclosed equipment
equipment which includes an enclosure, having safety capability, or combination of an
enclosure, having safety capability, and installation provisions enclosing on all sides, with the
possible exception of its mounting surface, to prevent personnel from accidentally touching
hazardous live, hot or moving parts contained therein and meeting requirements of
mechanical strength, flammability, and stability (where applicable)
Note 1 to entry: Examples are portable and hand-held equipment.
Note 2 to entry: This definition is related to IEC 60050-441:1990, 441-12-02.
3.102
enclosure
housing affording the type and degree of protection suitable for the intended application

61010-2-201 © IEC:2013 – 11 –
[SOURCE: IEC 60050-195:1998, 195-02-35]
Note 1 to entry: An enclosure, in general, may or may not have any safety capabilities. That depends on its
application purpose and construction.
Note 2 to entry: In this standard an enclosure is assumed to have safety capability, unless specifically stated
otherwise.
3.103
field wiring
wiring of the control equipment, which is installed by the user
Note 1 to entry: Examples of field wiring are power supply, digital and analogue input and output wiring.
3.104
hand-held equipment
equipment which is intended to be held in one hand while being operated with the other hand
3.105
modular equipment
equipment consisting of different modules such as a Rack, CPU, different I/O-modules,
network modules etc.
Note 1 to entry: Modular equipment
a) can be open equipment or enclosed equipment,
b) can consist of modules that cannot operate alone or of a basic module that is operational alone and can be
enhanced in functions by additional modules,
c) can vary in size and functionality depending on the combination and the number of modules and
d) can be combined with operational equipment or enhanced in function by the addition of modules by the
customer.
3.106
open equipment
equipment which does not protect personnel from accidentally touching live or moving parts
contained therein nor meet requirements of mechanical strength, flammability and stability
(where applicable)
Note 1 to entry: See Annex AA.
3.107
operator
person, with appropriate training and awareness of the general hazards in an industrial
environment, commanding and monitoring, but not changing, a machine or process
Note 1 to entry: The operator does not change e.g. the control equipment hardware configuration or install
software updates provided by the manufacturer.
Note 2 to entry: The operator commands and monitors a machine or process e.g. through an HMI connected to
the equipment.
3.108
portable equipment
equipment intended to be carried by hand and not fixed during normal use
3.109
protective extra-low voltage circuit
PELV circuit
electrical circuit in which the voltage cannot exceed a.c. 30 V r.m.s., 42,4 V peak or d.c. 60 V
in normal and single-fault condition, except earth faults in other circuits
Note 1 to entry: A PELV circuit incorporates a connection to protective earth. Without the protective earth
connection or if there is a fault in the protective earth connection the circuit voltages are not controlled.

– 12 – 61010-2-201 © IEC:2013
Note 2 to entry: Derived from IEC 60050-826:2004, 826-12-32, PELV system
3.110
safety extra-low voltage circuit
SELV circuit
electrical circuit in which the voltage cannot exceed a.c. 30 V r.m.s., 42,4 V peak or d.c. 60 V
in normal and single-fault condition, including earth faults in other circuits
Note 1 to entry: Derived from IEC 60050-826:2004, 826-12-31, SELV system.
3.111
service personnel
person, with the appropriate technical training, experience and awareness of hazards and of
measures to minimize danger to themselves, other persons or to the control equipment, in an
industrial environment, changing or repairing the control equipment
Note 1 to entry: Service personnel are persons having the appropriate technical training and experiences
necessary to be aware of hazards – e.g, electrical hazards, temperature hazards, fire hazards – to which they are
exposed in performing a task and of measures to minimize danger to themselves or to other persons or to the
control equipment, in an industrial environment
Note 2 to entry: Service personnel change or repair the control equipment e.g. hardware configuration or
installing software updates provided by the manufacturer.
4 Tests
This clause of Part 1 is applicable, except as follows.
4.1 General
Addition:
The product is verified to this standard in a test configuration, defined by the manufacturer,
which represents the least favourable configuration. See 4.3.
It is likely or possible that there are different test configurations which yield least favourable
test conditions, e.g. a least favourable configuration for temperature tests, a least favourable
test configuration for electrical safety test. If this is the case then these different least
favourable test configuration(s) shall be used in the test for which they are appropriate, with
regard to 4.3.2 and 4.4.
These least favourable test configurations and test conditions shall be practical and useful for
the intended applications.
Conformity verification: The selected test configuration(s) and test conditions shall be
documented with the rationale in the test report
4.3.2 State of equipment
Addition:
The state of the control equipment shall take into account the least favourable rated
environmental conditions. This may be taken into account by the actual test environment of
the control equipment or by suitable analysis and correction of the results in a set of reference
test conditions.
4.4 Testing in single fault condition
Addition of first line after 4.4:

61010-2-201 © IEC:2013 – 13 –
For test and verification conditions, see 4.1.
Additional subclause:
4.4.1.101 Switching devices tests
4.4.1.101.1 Overload test
Switching devices shall close and open a test circuit having the current, voltage, and power
factor values given in Table 101. Fifty cycles, each consisting of 1 closing and 1 opening,
shall be completed using a timing of 1 s on, 9 s off. After completion of the 50 cycles, the
equipment shall be subjected to the endurance test in 4.4.1.101.2, if required by 14.102.
Table 101 – Overload test circuit values
Intended use Current Voltage Power factor
AC general use 1,5 × rated Rated 0,75 to 0,80
DC general use Rated 1,0
1,5 × rated
AC resistance Rated 1,0
1,5 × rated
DC resistance 1,5 × rated Rated 1,0
a a
b
AC pilot duty Rated <0,35
1,1 × rated
a a
b
DC pilot duty Rated 1,0
1,1 × rated
a
Unless otherwise specified, the inrush current shall be 10 times the steady-state current.\
b
Set up the EUT at its rated voltage and current and then increase the voltage by 10 % without further
adjustment of the load.
NOTE Source IEC 61131-2:2007
Conformity, pass/fail, is determined by test completion without electrical/dielectric/mechanical
breakdown of the equipment.
4.4.1.101.2 Endurance test
After completion of the overload test in 4.4.1.101.1, the switching device is to close and open
a test circuit having the current, voltage, and power factor values given in Table 102. A total
of 6 000 cycles, consisting of 1 closing and 1 opening, shall be completed. The cycle timing
shall be 1 s on and 9 s off, except for the first 1 000 cycles of the pilot duty test. The first
1 000 cycles of the pilot duty test shall be at a rate of 1 cycle per second except that the first
10 to 12 cycles are to be as fast as possible.
The endurance test need not be conducted on solid-state output devices for general or
resistive use.
Table 102 – Endurance test circuit values
Intended use Current Voltage Power factor
AC general use Rated Rated 0,75 to 0,80
DC general use Rated Rated 1,0
AC resistance Rated Rated 1,0
DC resistance Rated Rated 1,0
a
AC pilot duty Rated Rated
<0,35
a
DC pilot duty Rated Rated 1,0
a
The test circuit is identical to the overload test circuit except that the voltage is the rated voltage.
NOTE Source IEC 61131-2:2007
– 14 – 61010-2-201 © IEC:2013
Conformity, pass/fail, is determined by test completion without electrical/dielectric/mechanical
breakdown of the equipment.
5 Marking and documentation
This clause of Part 1 is applicable, except as follows.
5.4.3 Equipment installation
Addition:
h) open equipment: If the control equipment is classified as open equipment its
documentation shall specify the final safety enclosure characteristics, e.g. safety enclosure
mechanical rigidity, IP rating.
Replacement of item d)1):
d) 1): supply and field wiring requirements, e.g. insulation, temperature rating
6 Protection against electric shock
This clause of Part 1 is applicable, except as follows.
6.1.2 Exceptions
Replacement:
If it is not feasible for operating reasons to prevent the following parts being both accessible
and hazardous live, they are permitted to be accessible to a service personnel during normal
use while they are hazardous live:
For example:
a) parts of lamps and lamp sockets after lamp removal;
b) parts intended to be replaced by an service personnel (for example, batteries) and which
may be hazardous live during the replacement or other service personnel action, but only
if they are accessible only by means of a tool and have a warning marking (see 5.2);
If any of the parts in examples a) and b) receive a charge from an internal capacitor, they
10 s after interruption of the supply.
shall not be hazardous live
If a charge is received from an internal capacitor, conformity is checked by the measurements
of 6.3 to establish that the levels of 6.3.1 c) are not exceeded.
6.2.1 General
This subclause of Part 1 is applicable to enclosed equipment.
6.2.2 Examination
This subclause of Part 1 is applicable to enclosed equipment.
6.2.3 Openings above parts that are hazardous live
This subclause of Part 1 is applicable to enclosed equipment.

61010-2-201 © IEC:2013 – 15 –
6.2.4 Openings for pre-set controls
Addition:
First paragraph: This subclause of Part 1 is applicable to enclosed equipment. This subclause
applies to service personnel.
Additional subclauses:
6.2.101 Accessibility of interfaces/ports/terminals
Peripherals
Ar
(perm anently /
Interface/port digital and analogue input signals
non-permanently installed)
C
Al J
I/O power interface/port
Remote IOs
C
Interface/port digital and analogue output signals
D
J
Local extension rack
I/O power interface/port
J
C
J D
J
C Communication interface/port with third- party
E
Input
devices (e.g. computers, printers)\
Module(s)
J
D
J
E
F
Processing Equipment power interface/port
D
Output
unit(s)
Module(s)
and
J E
F
Memory
K
Auxiliary power output interface/port
used to power sensors and actuators
Communicati
E
ons Modules
F
G
(optional)
K Protective earthing port
Basic
Control
F
K
Equipment
H
Power supply G
Functional earthing port
Be
K H
Open communication interface/port,
G
Auxiliary power
also open to third-party devices
Bi
supply (optional)
Be
H
G
Bi
H Be
Bi
Be
Bi
Internal communication interface/port
for peripherals
Interfaced devices and signals
Limit of the scope of this standard

IEC  148/13
Key
Al Communication interface/port for local extension rack
Ar Communication in
...