EN 60519-1:2011

SLOVENSKI STANDARD
01-april-2011
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SIST EN 60519-1:2004
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Safety in electroheating installations - Part 1: General requirements (IEC 60519-1:2010)
Sicherheit in Elektrowärmeanlagen - Teil 1: Allgemeine Anforderungen (IEC 60519-
1:2010)
Sécurité dans les installations électrothermiques - Partie 1: Exigences générales (CEI
60519-1:2010)
Ta slovenski standard je istoveten z: EN 60519-1:2011
ICS:
25.180.10 (OHNWULþQHSHþL Electric furnaces
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 60519-1
NORME EUROPÉENNE
January 2011
EUROPÄISCHE NORM
ICS 25.180.10 Supersedes EN 60519-1:2003

English version
Safety in electroheating installations -
Part 1: General requirements
(IEC 60519-1:2010)
Sécurité dans les installations Sicherheit in Elektrowärmeanlagen -
électrothermiques - Teil 1: Allgemeine Anforderungen
Partie 1: Exigences générales (IEC 60519-1:2010)
(CEI 60519-1:2010)
This European Standard was approved by CENELEC on 2011-01-03. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60519-1:2011 E
Foreword
The text of document 27/770/FDIS, future edition 4 of IEC 60519-1, prepared by IEC TC 27, Industrial
electroheating, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 60519-1 on 2011-01-03.
This European Standard supersedes EN 60519-1:2003.
The main technical changes with respect to EN 60519-1:2003 are as follows:
– scope and object have been modified, voltage limits and classification removed;
– terms/definitions, Annex ZA and bibliography have been updated and completed;
– Clause 4 on classification of equipment according to process frequency has been modified;
– Clause 5 (General requirements) has been redrafted and new provisions have been added (e.g.
relating to single fault conditions and EMF issues), following the recommendations of IEC Guide 104;
– Clause 8 has been redrafted, the contents of subclauses 8.2 and 8.3 has been moved to a new
normative Annex A and 8.4 has been deleted;
– a new Clause 12 (Protection against other hazards) has been added;
– clauses dealing with marking and documentation have been amended.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2011-10-03
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2014-01-03
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60519-1:2010 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60398:1999 NOTE  Harmonized as EN 60398:1999 (not modified).
IEC 61000-3-2 NOTE  Harmonized as EN 61000-3-2.
IEC 61000-3-3 NOTE  Harmonized as EN 61000-3-3.
IEC 61000-3-11 NOTE  Harmonized as EN 61000-3-11.
IEC 61000-6-2 NOTE  Harmonized as EN 61000-6-2.
IEC 62311:2007 NOTE  Harmonized as EN 62311:2008 (modified).
ISO 12100-1:2003 NOTE  Harmonized as EN ISO 12100-1:2003 (not modified).

- 3 - EN 60519-1:2011
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

IEC 60050-841 2004 International Electrotechnical Vocabulary - -
(IEV) -
Part 841: Industrial electroheat

IEC 60071-1 - Insulation co-ordination - EN 60071-1 -
Part 1: Definitions, principles and rules

IEC 60110-1 1998 Power capacitors for induction heating EN 60110-1 1998
installations -
Part 1: General
IEC 60204-1 (mod) 2005 Safety of machinery - Electrical equipment of EN 60204-1 2006
+ A1 2008 machines - + corr. February 2010
Part 1: General requirements + A1 2009

IEC 60204-11 - Safety of machinery - Electrical equipment of EN 60204-11 -
machines -
Part 11: Requirements for HV equipment for
voltages above 1 000 V a.c. or 1 500 V d.c.
and not exceeding 36 kV
IEC 60364-1 (mod) 2005 Low-voltage electrical installations - HD 60364-1 2008
Part 1: Fundamental principles, assessment
of general characteristics, definitions

IEC 60364-4-41 - Low-voltage electrical installations - HD 60364-4-41 -
(mod) Part 4-41: Protection for safety - Protection
against electric shock
IEC 60364-4-42 - Low voltage electrical installations - HD 60364-4-42 -
Part 4-42: Protection for safety - Protection
against thermal effects
IEC 60364-4-43 - Low voltage electrical installations - HD 60364-4-43 -
(mod) Part 4-43: Protection for safety - Protection
against overcurrent
IEC 60364-5-53 - Electrical installations of buildings - - -
Part 5-53: Selection and erection of electrical
equipment - Isolation, switching and control

IEC 60364-5-54 - Electrical installations of buildings - HD 60364-5-54 -
(mod) Part 5-54: Selection and erection of electrical
equipment - Earthing arrangements,
protective conductors and protective bonding
conductors
IEC 60417 - Graphical symbols for use on equipment - -

Publication Year Title EN/HD Year

IEC 60446 - Basic and safety principles for man-machine EN 60446 -
interface, marking and identification -
Identification of conductors by colours or
alphanumerics
IEC 60529 - Degrees of protection provided by enclosures - -
(IP Code)
IEC 60664-1 - Insulation coordination for equipment within EN 60664-1 -
low-voltage systems -
Part 1: Principles, requirements and tests

IEC 61140 - Protection against electric shock - Common EN 61140 -
aspects for installation and equipment

IEC 61936-1 (mod) - Power installations exceeding 1 kV a.c. - EN 61936-1 -
Part 1: Common rules
CISPR 11 (mod) - Industrial, scientific and medical equipment - EN 55011 -
Radio-frequency disturbance characteristics -
Limits and methods of measurement

ISO 3864-1 - Graphical symbols - Safety colours and safety - -
signs -
Part 1: Design principles for safety signs in
workplaces and public areas
ISO 7000 - Graphical symbols for use on equipment - - -
Index and synopsis
IEC 60519-1 ®
Edition 4.0 2010-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Safety in electroheating installations –
Part 1: General requirements
Sécurité dans les installations électrothermiques –
Partie 1: Exigences générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
V
CODE PRIX
ICS 25.180.10 ISBN 978-2-88912-264-6
– 2 – 60519-1 Ó IEC:2010
CONTENTS
FOREW ORD . 4
INTRODUCTION . 6
1 Scope and object . 7
2 Normativ e references . 8
3 Terms and definitions . 9
4 Classification of electroheating equipment . 15
4.1 General . 15
4.2 Classification of electroheating equipment according to process frequency . 15
4.2.1 Direct current equipment . 15
4.2.2 Low-frequency equipment. 16
4.2.3 Mains-frequency equipment . 16
4.2.4 Medium-frequency equipment . 16
4.2.5 High-frequency equipment . 16
4.2.6 Microwave equipment . 16
4.2.7 Infrared equipment . 16
5 General requirements . 16
5.1 General . 16
5.2 Electroheating equipment . 17
5.3 Electric equipment of electroheating installations . 18
5.4 Electrostatic charges . 19
5.5 Magnetic, electric and electromagnetic fields . 19
5.6 Electromagnetic compatibility . 19
5.7 Ionizing radiation . 20
5.8 Liquid cooling . 20
6 Isolation and switching . 20
6.1 General . 20
6.2 Switching-off of control and auxiliary circuits . 21
6.3 Switching at high voltage levels . 21
7 Connection to the electrical supply network and internal connections . 21
7.1 General requirements . 21
7.2 Fixed electric connection . 22
7.3 Removable connection and flexible conductors . 22
8 Protection against electric shock . 22
8.1 General . 22
8.2 Direct contact – special measures. 23
8.3 Indirect contact – special measures . 23
9 Equipotential bonding . 23
9.1 General . 23
9.2 Protective bonding circuits . 23
9.2.1 General. 23
9.2.2 Protective conductors . 23
9.2.3 Continuity of the protective bonding system. 23
9.2.4 Exclusion of switching devices from the protective bonding system . 23
9.2.5 Parts that need not be connected to the protective bonding system . 23
9.2.6 Interruption of the protective bonding system . 24

60519-1 Ó IEC:2010 – 3 –
9.2.7 Protective conductor connecting points . 24
9.2.8 Protective bonding for electroheating installations with earth
leakage current above 10 mA . 24
9.3 Functional bonding . 24
9.4 Prohibition of the use of earth as part of an active circuit . 24
10 Control circuits and control functions . 24
10.1 Control circuits . 24
10.2 Earthing of control circuits . 25
10.3 Control functions . 25
10.3.1 General. 25
10.3.2 Start and stop functions . 26
10.3.3 Operating modes . 26
10.3.4 Suspension of safety functions and/or protective measures . 26
10.3.5 Emergency operations . 26
10.3.6 Cableless control . 26
10.4 Control functions in the event of failure . 26
11 Protection against thermal influences . 26
12 Protection against other hazards . 27
13 Marking, labelling and technical documentation . 27
13.1 Marking . 27
13.2 Warning marking . 28
13.3 Labell ing . 28
13.4 Technical documentation . 28
14 Commissioning, inspection, operation and maintenance . 28
14.1 General requirements . 28
14.2 Commissioning and inspection. 29
14.3 Safety instructions for operation . 29
14.4 Instructions for maintenance work . 29
Annex A (normative) Protection against electric shock – special measures . 31
Bibliography . 32

– 4 – 60519-1 Ó IEC:2010
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY IN ELECTROHEATING INSTALLATIONS –

Part 1: General requirements
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in
addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60519-1 has been prepared by IEC technical committee 27:
Industrial electroheating.
This fourth edition cancels and replaces the third edition published in 2003. It constitutes
a technical revision.
The main technical changes with respect to the previous edition are as follows:
– scope and object have been modified, voltage limits and classification removed;
– terms/definitions, normative references and bibliography have been updated and
completed;
– Clause 4 on classification of equipment according to process frequency has been
modified;
– Clause 5 (General requirements) has been redrafted and new provisions have been
added (e.g. relating to single fault conditions and EMF issues), following the
recommendations of IEC Guide 104;

60519-1 Ó IEC:2010 – 5 –
– Clause 8 has been redrafted, the contents of subclauses 8.2 and 8.3 has been moved to
a new normative Annex A and 8.4 has been deleted;
– a new Clause 12 (Protection against other hazards) has been added;
– clauses dealing with marking and documentation have been amended.
The text of this standard is based on the following documents:
FDIS Report on voting
27/770/FDIS 27/778/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.
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of IEC 60519 series, under the general title Safety in electroheating
installations, can be found on the IEC website.
Future standards in this series will carry the new general title as cited above. Titles of
existing standards in this series will be updated at the time of a new edition.
The clauses of parts of the IEC 60519 series (hereinafter called Particular Requirements)
supplement or modify the corresponding clauses of Part 1. Where the text of subsequent
parts indicates an "addition" to or a "replacement" of the relevant provision of Part 1, these
changes are made to the relevant text of Part 1. Where no change is necessary, the words
"This clause of Part 1 is applicable" are used. Additional specific provisions to those in
Part 1 are given in the Particular Requirements as additional clauses, subclauses or
Annexes.
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.
– 6 – 60519-1 Ó IEC:2010
INTRODUCTION
International Standard IEC 60519 Safety in electroheating installations consists of several
parts. Part 1 comprises clauses of a general character and provisions common to various
types of industrial electroheating installations or equipment. Subsequent parts of the
IEC 60519 series (hereinafter called Particular Requirements) contain specific provisions
for particular types of electroheating installations or equipment.
Part 1: General requirements
Part 2: Particular requirements for resistance heating equipment
Part 3: Particular requirements for induction and conduction heating and induction
melting installations
Part 4: Particular requirements for arc furnace installations
Part 5: Specifications for safety in plasma installations
Part 6: Specifications for safety in industrial microwave heating equipment
Part 7: Particular requirements for installations with electron guns
Part 8: Particular requirements for electroslag remelting furnaces
Part 9: Particular requirements for high-frequency dielectric heating installations
Part 10: Particular requirements for electrical resistance trace heating systems for
industrial and commercial applications
Part 11: Particular requirements for installations using the effect of electromagnetic
forces on liquid metals
Part 21: Particular requirements for resistance heating equipment – Heating and
melting glass equipment
NOTE Additional parts covering particular industrial electroheating installations or equipment may be prepared in
the future.
60519-1 Ó IEC:2010 – 7 –
SAFETY IN ELECTROHEATING INSTALLATIONS –

Part 1: General requirements
1 Scope and object
This part of IEC 60519 specifies the general safety requirements applicable to industrial
electroheating installations.
In case these requirements differ from those of other IEC publications, an equivalent
degree of safety is ensured.
The requirements apply to industrial installations, intended for electroheating and
electroheat based treatment technologies, with the possible use of the following equipment:
– equipment for direct and indirect resistance heating;
– equipment for electric resistance trace heating;
– equipment for induction heating;
– equipment using the effect of EM forces on liquid metals;
– equipment for arc heating, including submerged arc heating;
– equipment for electroslag remelting;
– equipment for plasma heating;
– equipment for microwave heating;
– equipment for dielectric heating;
– equipment for electron beam heating;
– equipment for laser heating;
– equipment for infrared radiation heating.
NOTE 1 The list presents typical examples of equipment used in installations covered by this standard and is not
exhaustive.
This standard is not applicable for heating appliances for household (e.g. electric cooking),
laboratory or medical applications or for welding equipment, if covered by other particular
standards, nor does it apply to any kind of space heating.
This standard refers to normal operation of industrial electroheating installations. It is
intended to ensure the safety of persons also in the case of abnormal operation and when
faults occur in electroheating installations. This standard presumes that the installations are
operated and maintained only by personnel consisting of instructed or skilled persons,
respectively.
The object of this standard is to specify the general safety requirements for electroheating
installations. These safety requirements concern the protection of persons and the
environment against dangers of electrical origin and also against certain dangers of non-
electrical origin, common to all types of equipment and installations.
Certain clauses of this standard concern not only safety of personnel but also protection of
the environment.
The overall safety requirements result from the joint application of the general requirements
specified in this standard and Particular Requirements concerning the specific industrial

– 8 – 60519-1 Ó IEC:2010
application of electroheat. These Particular Requirements supplement, modify or replace
the general requirements.
The Particular Requirements cover particular safety relevant features such as high voltages
and electric fields or high currents and magnetic fields, also with respect to the frequencies.
NOTE 2 Information on non-electrical hazards possibly arising from the utilization of industrial electroheating
equipment may also be taken from European Standard EN 746-1 (see Bibliography), which specifies common safety
requirements for industrial thermoprocessing equipment.
General test methods for industrial electroheating installations are specified in IEC 60398.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest
edition of the referenced document (including any amendments) applies.
IEC 60050-841:2004, International Electrotechnical Vocabulary – Part 841: Industrial
electroheat
IEC 60071-1, Insulation co-ordination – Part 1: Definitions, principles and rules
IEC 60110-1:1998, Power capacitors for induction heating installations – Part 1: General
IEC 60204-1:2005 , Safety of machinery – Electrical equipment of machines – Part 1:
General requirements
Amendment 1 (2008)
IEC 60204-11, Safety of machinery – Electrical equipment of machines – Part 11:
Requirements for HV equipment for voltages above 1 000 V a.c. or 1 500 V d.c. and not
exceeding 36 kV
IEC 60364-1:2005, Low-voltage electrical installations – Part 1: Fundamental principles,
assessment of general characteristics, definitions
IEC 60364-4-41, Low-voltage electrical installations – Part 4-41: Protection for safety –
Protection against electric shock
IEC 60364-4-42, Low-voltage electrical installations – Part 4-42: Protection for safety –
Protection against thermal effects
IEC 60364-4-43, Low-voltage electrical installations – Part 4-43: Protection for safety –
Protection against overcurrent
IEC 60364-5-53, Electrical installations of buildings – Part 5-53: Selection and erection of
electrical equipment – Isolation, switching and control
IEC 60364-5-54, Electrical installations of buildings – Part 5-54: Selection and erection of
electrical equipment – Earthing arrangements, protective conductors and protective bonding
conductors
———————
There is a consolidated edition 5.1 (2009) that includes IEC 60204-1 (2005) and its amendment 1 (2008).

60519-1 Ó IEC:2010 – 9 –
IEC 60417, Graphical symbols for use on equipment
IEC 60446, Basic and safety principles for man-machine interface, marking and
identification – Identification of conductors by colours or alphanumerics
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60664-1, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests
IEC 61140, Protection against electric shock – Common aspects for installation and
equipment
IEC 61936-1, Power installations exceeding 1 kV a.c. – Part 1: Common rules
CISPR 11, Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
ISO 3864-1, Graphical symbols – Safety colours and safety signs – Part 1: Design principles
for safety signs in workplaces and public areas
ISO 7000, Graphical symbols for use on equipment – Index and synopsis
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-841:2004
and the following apply.
NOTE 1 Unless otherwise stated, the terms "voltage" and "current" apply to the r.m.s. values in the case of a.c.
NOTE 2 The electrical terms and quantities associated with the word "rated" refer to the electroheating equipment
itself, unless otherwise stated. The terms "rated voltage", "rated current" or "rated power" refer to the voltage (in the
case of a three-phase system, the voltage between phases), the current or the power specified by the manufacturer
and marked on the electroheating equipment.
3.1
direct contact
electric contact of persons or animals with live parts
[IEC 60050-195:1998, 195-06-03]
3.2
earthing conductor
grounding conductor (US)
earth conductor (deprecated)
conductor which provides a conductive path, or part of the conductive path, between a
given point in a system or in an installation or in equipment and an earth electrode
[IEC 60050-195:1998, 195-02-03]
3.3
earth leakage current
current flowing from the live parts of the installation to earth, in the absence of an insulation
fault
[IEC 60050-442: 1998, 442-01-24]

– 10 – 60519-1 Ó IEC:2010
3.4
electric connection
means or actual condition that allows or ensures the passage of electric current between
two conductive parts
3.5
electric equipment
item used for such purposes as generation, conversion, transmission, distribution or
utilization of electric energy, such as converters, transformers, capacitors, switchgear and
controlgear, measuring instruments, protective devices and wiring systems
[IEC 60050-826:2004, 826-16-01, modified]
3.6
electrical installation
assembly of associated electric equipment having co-ordinated characteristics to fulfil
specific purposes
[IEC 60050-826:2004, 826-10-01]
3.7
(electrically) instructed person
person adequately advised or supervised by electrically skilled persons to enable him or her
to perceive risks and to avoid hazards which electroheating installations can create
(operating and maintenance staff)
[IEC 60050-826:2004, 826-18-02, modified]
3.8
(electrically) skilled person
person with relevant education and experience to enable him or her to perceive risks and to
avoid hazards which electroheating installations can create
[IEC 60050-826:2004, 826-18-01, modified]
3.9
electroheat
branch of science and technology dealing with the conversion of electric energy into
thermal energy for useful purposes
[IEC 60050-841:2004, 841-21-22, modified]
3.10
electroheating equipment
electroheat equipment
equipment in which electric energy is converted into thermal energy for useful purposes
NOTE The term covers also equipment using the effect of electromagnetic forces on liquid metals.
[IEC 60050-841:2004, 841-22-01, modified]
3.11
electroheating installation
electroheat installation
installation composed of electroheating equipment, electric equipment and mechanical
accessories needed for its operation and use
[IEC 60050-841:2004, 841-22-02, modified]

60519-1 Ó IEC:2010 – 11 –
3.12
emergency switching-off
operation intended to switch-off any electric power from an electrical installation to avert or
alleviate a hazardous situation
[IEC 60050-826:2004, 826-17-03, modified]
3.13
enclosure
housing affording the type and degree of protection suitable for the intended application
[IEC 60050-195:1998, 195-02-35]
NOTE For the classification of degrees of protection provided by enclosures (IP Code), see IEC 60529.
3.14
equipotential bonding
provision of electric connections between conductive parts, intended to put them at a
substantially equal potential
[IEC 60050-195:1998, 195-01-10, modified]
3.15
equipotential bonding system
EBS
interconnection of conductive parts providing equipotential bonding between those parts
NOTE If an equipotential bonding system is earthed, it forms part of an earthing arrangement.
[IEC 60050-195:1998, 195-02-22]
3.16
exposed conductive part
conductive part of electrical equipment, which can be touched and which is not live in
normal operation, but which can become live under fault conditions
[IEC 60050-826:2004, 826-12-10, modified]
3.17
extraneous conductive part
conductive part not forming part of the electrical installation and liable to introduce an
electric potential, generally the electric potential of a local earth
[IEC 60050-826:2004, 826-12-11]
3.18
failure
termination of the ability of an item to perform a required function
NOTE 1 After a failure the item has a fault.
NOTE 2 "Failure" is an event, as distinguished from "fault", which is a state.
NOTE 3 This concept as defined does not apply to items consisting of software only.
NOTE 4 In practice, the terms fault and failure are often used synonymously.
[IEC 60204-1:2005, 3.25]
– 12 – 60519-1 Ó IEC:2010
3.19
fault
state of an item characterized by inability to perform a required function, excluding the
inability during preventive maintenance or other planned actions, or due to lack of external
resources
NOTE 1 A fault is often the result of a failure of the item itself, but may exist without prior failure.
NOTE 2 In English, the term “fault” and its definition are identical with those given in IEV 191-05-01. In the field of
machinery, the French term “défaut” and the German term “Fehler” are used rather than the terms “panne” and
“Fehlzustand” that appear with this definition.
[IEC 60204-1:2005, 3.26]
3.20
fixed electric connection
electric connection requiring the use of a tool for mounting and dismantling purposes
NOTE In all other cases, the connection is removable.
3.21
functional bonding
equipotential bonding necessary for proper functioning of electrical equipment
[IEC 60204-1:2005, 3.27]
3.22
functional switching
operation intended to switch on or off or vary the supply of electric energy to an electrical
installation or parts of it for normal operating purposes
[IEC 60050-826:2004, 826-17-05]
3.23
harm
physical injury or damage to the health of people, or damage to property or the environment
[ISO/IEC Guide 51:1999, 3.3]
3.24
hazard
potential source of harm
NOTE The term hazard can be qualified in order to define its origin (e.g. electrical hazard, mechanical hazard) or
the nature of the potential harm (e.g. electric shock hazard, cutting hazard, toxic hazard, fire hazard).
[ISO/IEC Guide 51:1999, 3.5, modified]
3.25
indirect contact
electric contact of persons or animals with exposed-conductive parts which have become
live under fault conditions
[IEC 60050-195:1998, 195-06-04]
3.26
input frequency
frequency of the supply voltage to the electroheating installation

60519-1 Ó IEC:2010 – 13 –
3.27
insulation
all the insulating materials necessary to ensure the proper operation of the equipment and
protection against electric shock
NOTE 1 It refers also to the action of insulating.
NOTE 2 Under certain circumstances, the heat insulation materials employed for electroheating equipment may
equally perform the function of the electrical insulation.
3.28
isolation
function intended to make dead for reasons of safety all or a discrete section of the
electrical installation by separating the electrical installation or section from every source of
electric energy
[IEC 60050-826:2004, 826-17-01]
3.29
leakage current
earth current (deprecated)
electric current in an unwanted conductive path under normal operating conditions
[IEC 60050-195:1998,195-05-15]
3.30
live part
conductor or conductive part intended to be energized in normal operation, including a
neutral conductor, but by convention not a PEN conductor or PEM conductor or PEL
conductor
NOTE This concept does not necessarily imply a risk of electric shock.
[IEC 60050-195:1998, 195-02-19]
3.31
manufacturer
maker of the electroheating equipment or installation (who may also be the supplier,
importer or agent) responsible for compliance with this standard
NOTE From the perspective of the user, the manufacturer is a party responsible for the design, development,
manufacture, supply and commissioning of the equipment or installation.
3.32
normal operation
operation of the electroheating installation or equipment specified by the manufacturer and
agreed with the user
3.33
PEL conductor
conductor combining the functions of both a protective earthing conductor and a line
conductor
[IEC 60050-195:1998,195-02-14]
3.34
PEM conductor
conductor combining the functions of both a protective earthing conductor and a mid-point
conductor
[IEC 60050-195:1998, 195-02-13]

– 14 – 60519-1 Ó IEC:2010
3.35
PEN conductor
conductor combining the functions of both a protective earthing conductor and a neutral
conductor
[IEC 60050-195:1998, 195-02-12]
3.36
photocoupler
optocoupler
optoelectronic device designed for the transfer of electrical signals by utilizing optical
radiation to provide coupling while the output is isolated from the input
[IEC 60050-521:2002, 521-04-45]
NOTE This device may provide immunity against electromagnetic influences as well as independence of the
distance of two voltage system levels.
3.37
process frequency
frequency of voltage or current used for the process in which electric energy is converted
into thermal energy
3.38
protective conductor
(identification: PE)
conductor provided for purposes of safety, for example protection against electric shock
[IEC 60050-195:1998, 195-02-09]
NOTE In an electrical installation, the PE conductor is normally also considered as a protective earthing conductor.
3.39
protective earthing
protective grounding (US)
earthing a point or points in a system or in an installation or in equipment, for purposes of
electrical safety
[IEC 60050-195:1998, 195-01-11]
3.40
protective equipotential bonding system
PEBS
equipotential bonding system providing protective-equipotential-bonding
[IEC 60050-826:2004, 826-13-31]
3.41
protective earthing conductor
protective grounding conductor (US)
protective conductor provided for protective earthing
[IEC 60050-195:1998, 195-02-11]
3.42
rated voltage
voltage for which an installation (or a part thereof) is designed

60519-1 Ó IEC:2010 – 15 –
3.43
reasonably foreseeable misuse
use of a product, process or service in a way not intended by the supplier, but which may
result from readily predictable human behaviour
[ISO/IEC Guide 51:1999, 3.14]
3.44
residual voltage (on a capacitor)
voltage remaining between the terminals of a capacitor after switching off its supply
[IEC 60110-1:1998, 1.3.24, modified]
3.45
single fault condition
condition in which one means for protection against hazard is defective
NOTE If a single fault condition results unavoidably in another single fault condition, the two failures are
considered as one single fault condition.
[IEC 60050-851:2008, 851-11-20]
3.46
supply network
supply system
electric power transmission or distribution system not exclusively used for supplying an
electroheating installation
3.47
switching-off for mechanical maintenance
opening operation of a switching device intended to inactivate an item or items of
electrically powered equipment for the purpose of preventing a hazard, other than that due
to electric shock or to arcing, during non-electrical work on the equipment
[IEC 60050-826:2004, 826-17-02]
3.48
user
party or parties responsible for the use and maintenance of the electroheating equipment or
installation, from putting into service to de-commissioning at the end of product life
3.49
workload
object or material being processed
4 Classification of electroheating equipment
4.1 General
Electroheating equipment is in general classified according to process frequency as
specified in 4.2.
4.2 Classification of electroheating equipment according to process frequency
4.2.1 Direct current equipment
Equipment with rated process frequency of 0 Hz.

– 16 – 60519-1 Ó IEC:2010
4.2.2 Low-frequency equipment
Equipment with rated process frequencies not greater than 60 Hz (excluding
mains-frequency equipment).
4.2.3 Mains-frequency equipment
Equipment with rated process frequency equal to the frequenc
...