IEC 60204-11:2018

IEC 60204-11 ®
Edition 2.0 2018-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Safety of machinery – Electrical equipment of machines –
Part 11: Requirements for equipment for voltages above 1 000 V AC or 1 500 V
DC and not exceeding 36 kV
Sécurité des machines – Équipement électrique des machines –
Partie 11: Exigences pour les équipements fonctionnant à des tensions
supérieures à 1 000 V en courant alternatif ou 1 500 V en courant continu et ne
dépassant pas 36 kV
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IEC 60204-11 ®
Edition 2.0 2018-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Safety of machinery – Electrical equipment of machines –

Part 11: Requirements for equipment for voltages above 1 000 V AC or 1 500 V

DC and not exceeding 36 kV
Sécurité des machines – Équipement électrique des machines –

Partie 11: Exigences pour les équipements fonctionnant à des tensions

supérieures à 1 000 V en courant alternatif ou 1 500 V en courant continu et ne

dépassant pas 36 kV
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.110; 29.020 ISBN 978-2-8322-5904-7

– 2 – IEC 60204-11:2018 © IEC 2018
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 10
2 Normative references. 11
3 Terms and definitions . 12
4 General requirements . 18
4.1 General . 18
4.2 Selection of electrical equipment . 19
4.3 Electrical power supply . 20
4.3.1 General . 20
4.3.2 Voltage characteristics . 20
4.3.3 On-board power supply . 20
4.4 Physical environment and operating conditions . 20
4.4.1 General . 20
4.4.2 Electromagnetic compatibility (EMC) . 20
4.5 Transportation and storage . 21
4.6 Provisions for handling . 21
4.7 Installation . 21
4.7.1 General . 21
4.7.2 Assembly and mounting . 21
5 Incoming supply conductor terminations and devices for disconnecting and
switching off . 21
5.1 Incoming high-voltage conductor terminations . 21
5.2 Earthing terminal of high-voltage equipment . 21
5.3 Supply disconnecting devices and means for earthing . 22
5.3.1 General . 22
5.3.2 Type . 22
5.3.3 Requirements for disconnectors . 23
5.3.4 Requirements for earthing and short-circuiting . 23
5.3.5 Arrangement of disconnecting and earthing devices . 24
5.4 Devices for switching off for prevention of unexpected start-up . 24
5.5 Devices for disconnecting and means for earthing HV equipment . 24
5.6 Protection against unauthorized, inadvertent and/or mistaken operation . 25
6 Protection against electric shock . 25
6.1 General . 25
6.2 Protection against direct contact . 26
6.3 Protection against indirect contact . 26
6.3.1 General . 26
6.3.2 Measures to prevent the occurrence of a hazardous touch voltage for
an unlimited time of fault duration . 26
6.3.3 Protection by automatic disconnection of supply within a limited time of
fault duration . 27
6.3.4 Protection for mobile machines . 27
7 Protection of HV equipment . 28
7.1 General . 28
7.2 Overcurrent protection . 28

7.2.1 General . 28
7.2.2 Supply conductors . 28
7.2.3 Power circuits . 28
7.2.4 Transformers . 28
7.2.5 Overcurrent protective devices . 29
7.2.6 Rating and setting of overcurrent protective devices . 29
7.3 Protection of motors against overheating . 29
7.4 Protection against abnormal temperature . 29
7.5 Protection against the effects of supply interruption or voltage reduction and
subsequent restoration . 29
7.6 Motor overspeed protection . 29
7.7 Earth fault protection . 30
7.8 Protection against overvoltage due to lightning and switching surges . 30
7.9 Protection against hazards due to arc faults . 30
7.10 Protection against overpressure and leakage . 30
7.11 Protection against fire . 30
8 Equipotential bonding . 30
8.1 General . 30
8.2 Protective bonding circuit . 33
8.2.1 General . 33
8.2.2 Protective conductors . 34
8.2.3 Continuity of the protective bonding circuit . 34
8.2.4 Mobile machines . 35
8.2.5 Protective bonding circuit connecting points . 35
8.2.6 Supplementary protective bonding conductors . 36
9 Control systems, control circuits and control functions . 36
10 Operator interface and machine-mounted control devices . 36
11 Electronic equipment . 36
12 Controlgear: location, mounting, and enclosures . 36
12.1 General requirements . 36
12.2 Location and mounting . 37
12.2.1 Accessibility and maintenance . 37
12.2.2 Physical separation . 37
12.3 Degrees of protection . 37
12.4 Enclosures, doors and openings . 38
12.5 Access to HV equipment . 39
13 Conductors and cables . 39
13.1 General requirements . 39
13.2 Conductors . 39
13.3 Insulation and sheath materials . 40
13.4 Current-carrying capacity in normal service . 40
13.5 Conductor and cable voltage drop . 40
13.6 Minimum cross-sectional area . 40
13.7 Flexible cables . 40
13.7.1 General . 40
13.7.2 Mechanical rating . 41
13.7.3 Current-carrying capacity of cables wound on drums . 41
13.8 Conductor wires, conductor bars and slip-ring assemblies . 41

– 4 – IEC 60204-11:2018 © IEC 2018
13.8.1 Protection against direct contact . 41
13.8.2 Protective bonding circuit . 42
13.8.3 Protective conductor current collectors . 42
13.8.4 Clearances in air . 42
13.8.5 Creepage distances . 42
13.8.6 Conductor system sectioning . 43
13.8.7 Construction and installation of conductor wire, conductor bar systems
and slip-ring assemblies . 43
14 Wiring practices . 44
14.1 Connections and routing . 44
14.1.1 General requirements . 44
14.1.2 Cable runs . 44
14.2 Identification of conductors . 45
14.3 Flexible cables . 45
14.4 Plug-socket combinations . 46
14.5 Dismantling for shipment . 46
14.6 Cable trays . 46
15 Electric motors and associated equipment . 46
15.1 General . 46
15.2 Motor connection boxes . 46
16 Means to protect persons working on electrical installations . 47
16.1 General . 47
16.2 Equipment for isolating installations or apparatus . 47
16.3 Devices to prevent reclosing of isolating devices. 47
16.4 Devices for determining the de-energized state . 47
16.5 Devices for earthing and short-circuiting . 47
16.6 Equipment acting as protective barriers against adjacent live parts . 47
16.7 Storage of personal protection equipment . 47
17 Marking, warning signs and reference designations . 47
17.1 General . 47
17.2 Warning signs . 47
18 Technical documentation . 48
18.1 General . 48
18.2 Instructions for use . 48
18.2.1 General . 48
18.2.2 Provisions for handling . 48
18.2.3 Assembly and mounting . 48
18.2.4 Connections . 49
18.2.5 Final installation inspection . 49
18.2.6 Warning sign . 49
19 Testing and verification . 49
19.1 General . 49
19.2 Earthing system tests . 49
19.3 Insulation resistance tests . 50
19.4 Voltage tests . 50
19.5 Functional tests . 50
19.6 IP tests for HV equipment outside electrical operating areas . 50
19.7 Retesting . 50

Annex A (informative) Examples of machines covered by IEC 60204-11 . 51
Annex B (informative) Inquiry form for the HV equipment of machines . 52
Annex C (informative) Relationship between cable rated voltages and highest voltage
for HV equipment . 56
Bibliography . 57

Figure 1 – Block diagram of a machine containing HV equipment . 9
Figure 2 – Example of equipotential bonding for electrical equipment of a machine . 33
Figure 3 – Symbol for protective earth (protective ground) . 35
Figure 4 – Warning sign “high voltage” . 48
Figure 5 – DANGER hazard severity panel . 48

Table 1 – Maximum allowable conductor temperatures under normal and short-circuit
conditions . 39
Table 2 – De-rating factors for cables wound on drums . 41
Table 3 – Selection of the pollution level depending on the degree of protection and
insulator material . 43
Table 4 – Minimum creepage distance of conductor lines and slip ring assemblies . 43
Table B.1 – Overvoltage protection for HV equipment of machinery . 54
Table C.1 – Rated voltages of cable and highest voltage for HV equipment . 56

– 6 – IEC 60204-11:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY OF MACHINERY –
ELECTRICAL EQUIPMENT OF MACHINES –

Part 11: Requirements for equipment for voltages
above 1 000 V AC or 1 500 V DC and not exceeding 36 kV

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,
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agreement between the two organizations.
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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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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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
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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 60204-11 has been prepared by IEC technical committee 44:
Safety of machinery – Electrotechnical aspects.
This second edition cancels and replaces the first edition, published in 2000. This edition
constitutes a technical revision.
This edition contains significant technical changes with respect to the previous edition
regarding the following:
– aspects of risk assessment, which are mirrored from ISO 12100;
– equipotential bonding and earthing;
– EMC and power quality;
– HV switchgear and controlgear;

– creepage distances for conductors and slip-ring assemblies;
– a list of machinery using HV equipment, in Annex A.
This second edition of IEC 60204-11 has been updated and improved to reflect the
experience gained with the first edition and the evolution of high-voltage equipment reflected
in the relevant standards.
Regarding formal requirements, IEC 60204-11 has been aligned with
– IEC 60204-1:2016,
– IEC 61936-1:2010 and IEC 61936-1:2010/AMD1:2014,
– IEC 62271 (all parts).
This document is intended to be used in conjunction with IEC 60204-1.
The text of this International Standard is based on the following documents:
FDIS Report on voting
44/819/FDIS 44/828/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60204 series, published under the general title Safety of
machinery – Electrical equipment of machines, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document 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.
– 8 – IEC 60204-11:2018 © IEC 2018
INTRODUCTION
This part of IEC 60204 provides requirements and recommendations relating to the high-
voltage electrical equipment (HV equipment) of machines together with its associated low-
voltage electrical equipment (LV equipment) so as to promote
– safety of persons and property,
– consistency of control response,
– maintainability.
Figure 1 is a block diagram of a machine and associated equipment showing the various
elements of the electrical equipment addressed in this document. Numbers in parentheses
(…) refer to clauses and subclauses in this document. It is understood that all of the elements
taken together including the safeguards, software and the documentation constitute the
machine or group of machines working together with usually at least one level of supervisory
control.
This document should be used in conjunction with IEC 60204-1. HV equipment can include LV
control parts in the same general enclosure or in separate compartments.

Figure 1 – Block diagram of a machine containing HV equipment

– 10 – IEC 60204-11:2018 © IEC 2018
SAFETY OF MACHINERY –
ELECTRICAL EQUIPMENT OF MACHINES –

Part 11: Requirements for equipment for voltages
above 1 000 V AC or 1 500 V DC and not exceeding 36 kV

1 Scope
This part of IEC 60204 applies to electrical and electronic equipment and systems to
machines, including a group of machines working together in a co-ordinated manner, which
operate at nominal voltages above 1 000 V AC or 1 500 V DC and not exceeding 36 kV AC or
DC with nominal frequencies not exceeding 60 Hz.
In this document, the term HV equipment also covers the LV equipment forming an integral
part of the equipment operating at high voltage. The requirements in this document primarily
cover the parts operating at high-voltage except where explicitly stated otherwise.
NOTE 1 LV equipment not forming part of the HV equipment is covered by IEC 60204-1:2016.
NOTE 2 In this document, the term "electrical" includes both electrical and electronic matters (i.e. electrical
equipment means both the electrical and the electronic equipment).
NOTE 3 This document does not apply to independent high-voltage power supply installations for which separate
IEC standards exist.
The electrical equipment covered by this document commences at the point of connection of
the supply to the electrical equipment of the machine (see 5.1).
NOTE 4 For the requirements for high-voltage power supply installations, see IEC 61936-1.
This document is a generic safety standard. It does not cover all the requirements (e.g.
guarding, interlocking or control) which are needed or required by other standards or
regulations in order to safeguard personnel from hazards other than electrical hazards. Each
type of machine has unique requirements to be accommodated to provide adequate safety.
NOTE 5 In some machines the high-voltage power supply can be produced by a step-up transformer
(autotransformer), supplied by a low-voltage system (e.g. by a LV generator).
NOTE 6 In the context of this document, the term "person" refers to any individual; "personnel" are those persons
who are assigned and instructed by the user or his agent(s) in the use and care of the machine in question.
This part of IEC 60204 specifically includes, but is not limited to, machines as defined in 3.29
(Annex A lists examples of machines whose electrical equipment can be covered by this
document).
For protection against electric shock from high-voltage equipment, this document refers to
IEC 61936-1. When it comes to low-voltage equipment, this document refers to
IEC 60204-1:2016.
NOTE 7 High- and low-voltage standards use different terms regarding protection against electric shock. Whereas
high-voltage standards use the terms “direct contact” and “indirect contact”, low-voltage standards correspondingly
use “basic protection” and “fault protection”.
Additional and special requirements can apply to the electrical equipment of machines that
– are used in the open air (i.e. outside buildings or other protective structures);
– use, process or produce potentially explosive material (e.g. paint or sawdust);
– are used in potentially explosive and/or flammable atmospheres;

– have special risks when producing or using certain materials;
– are used in mines.
Hazards as a result of noise and vibration are excluded from the scope of this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements 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 60071-2:1996, Insulation co-ordination – Part 2: Application guide
IEC 60076-5, Power transformers – Part 5: Ability to withstand short-circuit
IEC 60204-1:2016, Safety of machinery – Electrical equipment of machines – Part 1: General
requirements
IEC 60364-5-54:2011, Low-voltage electrical installations – Part 5-54: Selection and erection
of electrical equipment – Earthing arrangements and protective conductors
IEC 60417, Graphical symbols for use on equipment (available at http://www.graphical-
symbols.info/equipment)
IEC 60445, Basic and safety principles for man-machine interface, marking and identification
– Identification of equipment terminals, conductor terminations and conductors.
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60865-1, Short-circuit currents – Calculation of effects – Part 1: Definitions and
calculation methods
IEC 61800 (all parts), Adjustable speed electrical power drive systems
IEC 61936-1:2010, Power installations exceeding 1 kV a.c. – Part 1: Common rules
IEC 61936-1:2010/AMD1:2014
IEC 62061, Safety of machinery – Functional safety of safety-related electrical, electronic and
programmable electronic control systems
IEC 62271-102, High-voltage switchgear and controlgear – Part 102: Alternating current
disconnectors and earthing switches
IEC 62271-103, High-voltage switchgear and controlgear – Part 103: Switches for rated
voltages above 1 kV up to and including 52 kV
IEC 62271-105, High-voltage switchgear and controlgear – Part 105: Alternating current
switch-fuse combinations for rated voltages above 1 kV up to and including 52 kV
IEC 62271-107, High-voltage switchgear and controlgear – Part 107: Alternating current fused
circuit-switchers for rated voltages above 1 kV up to and including 52 kV
IEC 62271-200:2011, High-voltage switchgear and controlgear – Part 200: AC metal-enclosed
switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV

– 12 – IEC 60204-11:2018 © IEC 2018
IEC 62271-201, High-voltage switchgear and controlgear – Part 201: AC solid-insulation
enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including
52 kV
IEC 62745, Safety of machinery – Requirements for cableless control systems of machinery
ISO 13849-1, Safety of machinery – Safety-related parts of control systems – Part 1: General
principles for design
ISO 3864-1:2011, Graphical symbols – Safety colours and safety signs – Part 1: Design
principles for safety signs and safety markings
ISO 3864-2:2016, Graphical symbols –Safety colours and safety signs – Part 2: Design
principles for product safety labels
ISO 7010:2011, Graphical symbols – Safety colours and safety signs – Registered safety
signs
ISO 12100, Safety of machinery –General principles for design – Risk assessment and risk
reduction
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
ambient temperature
temperature of the air or other medium where the equipment is to be used
3.2
barrier
part providing protection against contact with live parts from any usual direction of access
3.3
basic protection
protection against electric shock under fault-free conditions
Note 1 to entry: Previously referred to as “protection against direct contact”.
[SOURCE: IEC 60050-195:1998, 195-06-01, modified – The note has been added.]
3.4
cable tray
cable support consisting of a continuous base with raised edges but no covering
Note 1 to entry: A cable tray may be perforated or mesh.
[SOURCE: IEC 60050-826:2004, 826-15-08]

3.5
conductor wire
conductor bar
conductor rail
conductive wire, bar or rail of a feeder system with a sliding current collector
3.6
control circuit
circuit used for the control, including monitoring, of a machine and the
electrical equipment
3.7
control device
device connected into the control circuit and used for controlling the operation of the machine
EXAMPLE Position sensor, manual control switch, relay, magnetically operated valve.
3.8
controlgear
general term covering switching devices and their combination with associated control,
measuring, protective, and regulating equipment, also assemblies of such devices and
equipment with associated interconnections, accessories, enclosures, and supporting
structures, intended in principle for the control of electrical energy consuming equipment
[SOURCE: IEC 60050-441:2000, 441-11-03]
3.9
duct
enclosed channel designed expressly for holding and protecting electrical conductors, cables,
and busbars
Note 1 to entry: Conduits, cable trunking systems and underfloor channels are types of duct.
3.10
earthing system
all the electric connections and devices involved in the earthing of a system, an installation
and equipment
[SOURCE: IEC 60050-826:2004, 826-13-04, modified – The preferred terms have been
deleted and the deprecated term is used as a preferred term.]
3.11
electrical operating area
room or location for electrical equipment to which access is intended to be restricted to skilled
or instructed persons, by the opening of a door or the removal of a barrier without the use of a
key or tool, and which is clearly marked by appropriate warning signs
Note 1 to entry: An (electrically) instructed person is a person adequately advised or supervised by an electrically
skilled person to enable him or her to perceive risks and to avoid hazards which electricity can create (see
IEC 60050-826:2004, 826-18-02.
Note 2 to entry: An (electrically) skilled person is a person with relevant education and experience to enable him
or her to perceive risks and to avoid hazards which electricity can create (see IEC 60050-826:2004, 826-18-01)
3.12
electronic equipment
part of the electrical equipment containing circuitry mainly based on electronic devices and
components
– 14 – IEC 60204-11:2018 © IEC 2018
3.13
closed electrical operating area
room or location for operation of electrical installations and equipment to which access is
intended to be restricted to skilled or instructed persons or to lay personnel under the
supervision of skilled or instructed persons, e.g. by opening of a door or removal of a
protective barrier only by the use of a key or tool, and which is clearly marked by appropriate
warning signs
Note 1 to entry: See also Notes to entry 1 and 2 of definition 3.11.
3.14
enclosure
part providing a specified degree of protection of equipment against external influences and,
in any direction, a specified degree of protection against approach to or contact with live parts
and against contact with moving parts
Note 1 to entry: The definition needs the following explanations within the scope of this document:
Enclosures provide protection of persons or livestock against access to hazardous parts.
Barriers, shaped openings, or any other means suitable to prevent or limit the penetration of the specified test
probes, whether attached to the enclosure or formed by the enclosed equipment, are considered as part of the
enclosure, except where they can be removed without the use of a key or tool.
An enclosure may be
– a cabinet or box, either mounted on the machine or separate from the machine;
– a compartment consisting of an enclosed space within the machine structure.
[SOURCE: IEC 60050-441:2000, 441-13-01, modified – "of an assembly" has been deleted
and "in any direction" and the note have been added.]
3.15
equipment
items used in connection with the util
...