IEC 60519-6:2022

IEC 60519-6 ®
Edition 4.0 2022-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Safety in installations for electroheating and electromagnetic processing –
Part 6: Particular requirements for high frequency dielectric and microwave
heating and processing equipment

Sécurité dans les installations destinées au traitement électrothermique et
électromagnétique –
Partie 6: Exigences particulières pour les équipements de chauffage et de
traitement diélectriques à hautes fréquences et à hyperfréquences

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IEC 60519-6 ®
Edition 4.0 2022-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Safety in installations for electroheating and electromagnetic processing –

Part 6: Particular requirements for high frequency dielectric and microwave

heating and processing equipment

Sécurité dans les installations destinées au traitement électrothermique et

électromagnétique –
Partie 6: Exigences particulières pour les équipements de chauffage et de

traitement diélectriques à hautes fréquences et à hyperfréquences

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.180.10 ISBN 978-2-8322-1068-9

– 2 – IEC 60519-6:2022 © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
3.1 General concepts . 9
3.2 Equipment and state of equipment . 11
3.3 Parts and accessories . 13
4 Classification and subdivision of equipment and installations . 13
4.1 Classification by processing frequency. 13
5 Risk assessment . 14
6 General provisions. 14
7 Protection against hazards from electric shock . 15
8 Protection against hazards from electric or magnetic fields . 17
9 Protection against hazards from radiation . 20
10 Protection against hazards from thermal influences . 21
11 Protection against hazards from fire . 21
12 Protection against hazards from fluids . 22
13 Specific requirements for components and subassemblies . 22
14 Control of the installation or equipment . 22
15 Protection against mechanical hazards . 23
16 Protection against hazards resulting from use . 23
17 EMC . 23
18 Verification and testing . 23
19 Information for use . 23
Annex A (normative) List of significant hazards . 24
Annex B (normative) Limits to touch currents . 25
Annex C (normative) Non coherent optical radiation – Limits and risk classes. 26
Annex D (normative) Electric and magnetic fields . 27
Annex E (normative) Surface temperature limits . 28
Annex F (normative) EH, EPM and fire. 29
Annex G (normative) Marking and warning . 30
Annex H (informative) Guidelines on using this document . 31
Annex I (informative) Connection with ISO 13577 (all parts). 32
Annex J (informative) Requirements specific to the EU and associated countries. 33
Annex AA (normative) Information for use . 34
AA.1 General . 34
AA.2 Labelling . 34
Annex BB (normative) Measurements and evaluations of the high frequency emission
and contact current . 37
BB.1 General . 37
BB.2 Conditions of equipment operation for measurements . 37
BB.3 Evaluation of the HF field characteristics . 37

BB.4 Electric, magnetic fields, and contact currents. 38
BB.5 Limiting values, continuous energising of the processing frequency source . 39
BB.6 Limiting values, intermittent energising of the processing frequency source . 39
BB.7 Relaxation for processing frequencies up to 41 MHz . 39
BB.8 Risk classes . 40
BB.9 Instrumentation . 40
Annex CC (normative) Measurements and evaluations of the microwave emission . 44
CC.1 Conditions for measurement . 44
CC.2 Measurement details . 44
CC.3 Risk classes . 44
CC.4 Instrumentation . 45
Annex DD (informative) Rationales for the high frequency emission limits and
measurements . 49
DD.1 The biological effects of HF emissions from 3 MHz to 300 MHz. 49
DD.2 Today’s agreed limits for operator safety . 49
DD.3 Differences between the concepts in the cited standards and this document . 50
DD.4 Field behaviour . 51
DD.5 Conclusions . 60
Annex EE (informative) Rationales for the microwave barrier and associated

microwave leakage tests . 62
EE.1 Standard measurement of microwave emission . 62
EE.2 Microwave hazards – SAR basic restriction . 63
EE.3 Microwave hazard evaluation – free space exposure method . 63
EE.4 Microwave hazards from openings in cavities, and from exit and entrance
ports . 64
EE.5 Time averaging . 65
EE.6 Conclusions and modifications of the standards for ovens with a cavity door . 66
Bibliography . 67

Figure AA.1 – Examples of warning sign and labels . 35
Figure AA.2 – Labels at open HF applicators and handheld or open MW applicators . 35
Figure BB.1 – Large HF barrier for a conveyorised heating equipment scenario . 42
Figure BB.2 – Conditions for a HF plastic welding equipment . 43
Figure CC.1 – Large barrier for conveyorised microwave heating equipment . 46
Figure CC.2 – Small microwave access barrier for conveyorised microwave heating
equipment . 47
Figure CC.3 – Vertical-only MW barriers for conveyorised microwave heating
equipment . 48
Figure DD.1 – The overall complete scenario (left) with details . 53
Figure DD.2 – Field maxima with linear scaling (six top images) and decibel scaling
(six bottom images) . 55
Figure DD.3 – Quiver plots of momentary total fields at the same time phase . 56
Figure DD.4 – Power density patterns in the body-parts receiving the highest exposure
values . 57
Figure DD.5 – E field comparisons 30/100 MHz, and 100 MHz field polarisation . 58
Figure DD.6 – SAR maxima at 100 MHz in the scenario with only the body present . 59

Table 101 – Dimensional requirements for HF/MW barriers . 21
Table DD.1 – Maximum power densities in circularly cylindrical muscle objects

irradiated by 100 MHz plane waves with the E field parallel to the axis . 60

– 4 – IEC 60519-6:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY IN INSTALLATIONS FOR ELECTROHEATING
AND ELECTROMAGNETIC PROCESSING –

Part 6: Particular requirements for high frequency dielectric
and microwave heating and processing 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 this end and
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Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
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6) All users should ensure that they have the latest edition of this publication.
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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.
IEC 60519-6 has been prepared by IEC technical committee 27: Industrial electroheating and
electromagnetic processing. It is an International Standard.
This fourth edition cancels and replaces the third edition published in 2011.
This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the structure has been redrafted according to the IEC 60519-1:2020;
b) the scope and object have been redrafted;
c) the terms/definitions, normative references and bibliography have been updated and
completed;
d) all requirements and content from IEC 60519-6:2011 which are included in IEC 60519-
1:2020 were removed to avoid any duplication;
e) inclusion of high frequency equipment which was previously covered by IEC 60519-9:2005
(withdrawn). This edition constitutes an extension to high frequency equipment.
The text of this International Standard is based on the following documents:
Draft Report on voting
27/1142/FDIS 27/1144/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts in the IEC 60519 series, published under the general title Safety in installations
for electroheating and electromagnetic processing, can be found on the IEC website.
The clauses of this part 6 of the IEC 60519 series (called Particular Requirements) supplement
or modify the corresponding clauses of IEC 60519-1:2020 (General Requirements), hereinafter
called Part 1.
In this standard, the following print types are used:
– requirements and definitions: in roman type;
– NOTES: in smaller roman type;
– terms defined in Clause 3 in this document and in Part 1 are in bold type, from Clause 1.
This part of IEC 60519 is to be read in conjunction with Part 1. It supplements or modifies the
corresponding clauses of Part 1. Where the text indicates a “modification” of, “addition” to or a
“replacement” of the relevant provision of Part 1, these changes shall be made to the relevant
text of Part 1. Where no change is necessary, the words “This clause of Part 1 is applicable”
are used. When a particular subclause of Part 1 is not mentioned in this part, that subclause
applies as far as is reasonable. When a particular subclause of Part 1 is not applicable, the
word “void” is used.
Additional specific provisions to those in Part 1, given as individual clauses or subclauses, are
numbered starting from 101.
NOTE The following numbering system is used:
– subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
– unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;
– additional annexes are lettered AA, BB, etc.

– 6 – IEC 60519-6:2022 © IEC 2022
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.

INTRODUCTION
Some types of electroheating equipment, including the workload, can emit hazardous levels
of infrared radiation. It has been agreed in the IEC Technical Committee 27 that IEC 60519-12
addresses these infrared radiation aspects for this document.
This document presumes that the manufacturer possesses sufficient knowledge in equipment
design, manufacturing and documentation in accordance with good engineering practise, and
that the installation or equipment is operated and maintained only by personnel consisting of
skilled or instructed persons.
This document is intended to verify whether the installation or equipment meets the
requirements of safety, by design, and numerical verification if carefully carried out, site
acceptance tests, routine tests or inspection.

– 8 – IEC 60519-6:2022 © IEC 2022
SAFETY IN INSTALLATIONS FOR ELECTROHEATING
AND ELECTROMAGNETIC PROCESSING –

Part 6: Particular requirements for high frequency dielectric
and microwave heating and processing equipment

1 Scope
This clause of Part 1 is modified by the following regarding the areas of application.
Modification:
This part of IEC 60519 is applicable to equipment using high frequency or microwave energy
alone or in combination with other kinds of energy for industrial heating and processing of
materials. It is also applicable to HF and MW generators made available to users as separate
units.
This part is applicable to equipment operating in the frequency range 3 MHz to 300 GHz, with
the following limitations.
– This document applies to only high frequency dielectric heating and processing as defined
in 3.1.103. It does not apply to induction heating, which it is possible to carry out in the lower
part of the specified frequency band and is covered by IEC 60519-3, with magnetic field
safety aspects addressed in IEC TS 62997:2017, the latter to be replaced by a technical
report (TR) or by a revised technical specification (TS).
– The ISM centre frequencies for dielectric heating and processing of industrial interest are
narrow bands about 6,78 MHz, 13,56 MHz, 27,12 MHz and 40,68 MHz. Different field
emission measurement procedures and limiting values are applicable, depending on the
processing frequency in the high frequency range 3 to 300 MHz. Specifications are in
Annex BB.
– This document specifies limits for microwave emission only for the ISM frequencies
between 800 MHz and 6 MHz, as specified in Annex CC. For other microwave frequencies
the basic restriction and IEC 62311 apply.
– The foundations for compliance with emission values are the basic restrictions, referred to
in the IEEE/ANSI C95.1:2019 and Directive 2013/35/EU. However, maximum HF
processing frequency electric and magnetic field values are taken from the
IEEE/ANSI C95.1:2019 standard, as indicated in Annex BB.
– This document is not applicable to:
• appliances for household and similar use (covered by e.g. IEC 60335-2-25);
• commercial use (covered by IEC 60335-2-90 and IEC 60335-2-110);
• laboratory use (covered by IEC 61010-2-010);
• medical high frequency equipment and accessories (covered by IEC 60601-2-2).
NOTE 101 Since high frequency and microwave tunnel ovens and also some other types of microwave and high
frequency equipment are sometimes intended either for commercial, laboratory or industrial use, the following criteria
are suitable for determination of the classification as industrial equipment:
– commercial equipment is typically designed and planned for series production of many identical units, whereas
industrial equipment is typically produced in small series or even as single units. The processed goods are
consumed or ready for final use at the end of the heating process.
– laboratory heating equipment is for preparing material in a laboratory environment, and the processed material
is immediately available for investigations or further processing. Regular production of large quantities of material
is not foreseen.
– with industrial equipment, the processed goods are not immediately accessible to the end user, and the goods
are sometimes not in a final state from the perspective of the end user.
2 Normative references
This clause of Part 1 is applicable with the following addition.
Addition:
IEEE/ANSI C95.1:2019, IEEE standard for safety levels with respect to human exposure to
electric, magnetic, and electromagnetic fields, 0 Hz to 300 GHz
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60519-1 and the
following 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
Additions:
3.1 General concepts
3.1.101
basic restrictions
BR
restrictions on in situ (i.e. internal) electric fields or specific absorption rates (SAR) or power
densities with time and spatial averaging or integration, resulting from a part of or the whole
body being subjected to an external alternating electric (E) field, magnetic (B) flux or
electromagnetic field, and that are intended to be based directly on resulting established
pathophysiological effects
Note 1 to entry: The term exposure is defined in 3.4.14 in Part 1. Other definitions are provided in Annex DD.2.1.
There are no exposure requirements in this document since its definition does not consider any specific
characteristics of the source and accessible emission, as in this document. See Note 3 to entry.
Note 2 to entry: Basic restrictions have a safety margin to harm.
Note 3 to entry: Sources of scientific and medical information on numerical values of limits for workers are e.g.
IEEE, ICNIRP and EU; see the Bibliography. Another term for the basic restrictions is exposure limit values (ELV).
Note 4 to entry: Time factors of specific absorption rates (SAR) or power densities, i.e. energy absorption versus
time and over which tissue volumes are necessary for establishing criteria.
[SOURCE: IEC TS 62997:2017, 3.1.2, modified, to be replaced by a technical report (TR) or by
a revised technical specification (TS)]
3.1.102
contact current
induced current
current flowing into the body resulting from contact with a conductive object in an electric,
magnetic or electromagnetic field
Note 1 to entry: The scientific definition of induced current in IEC 60050-121:1998, 121-11-29 is replaced here, but the
definitions are consistent.
– 10 – IEC 60519-6:2022 © IEC 2022
Note 2 to entry: A touch current flows through the body or body-parts between two defined contact areas as defined
in e.g. Entry 3.4.6 in Part 1.
[SOURCE: IEC TR 63167:2018, 3.1]
3.1.103
dielectric heating and processing
electric treatment process in which the heat is generated in lossy dielectric or semiconducting
HF loads in the frequency range 1 MHz to 300 MHz
Note 1 to entry: The addition of “lossy” is used in this context since the power absorption mechanism can be by
dipolar relaxation and ionic or other conductivity phenomena.
Note 2 to entry: Dielectric heating and processing does not apply to metallic HF loads.
[SOURCE: IEC 60050-841:2004, 841-28-01, modified – The entry has been extended by adding
“processing”, the definition has been completed by adding “lossy” and two notes have been
added.]
3.1.104
electric nearfield
accessible emission of an electric field at a distance, characterised by fulfilling the criterion
of dielectric heating and processing
Note 1 to entry: The practical consequence of the definition is that the accessible emission of the electric nearfield
|E| ) is approximately equal to or higher than the magnetic nearfield energy (proportional
energy (proportional to ε
to µ |H| ) in the same locations, where ε is the electric constant and µ the magnetic constant. Due to the relative
0 0 0
phase of these fields, their coupling to body-parts is very different than from a propagating electromagnetic field.
3.1.105
electromagnetic emission
phenomenon by which electric, magnetic or electromagnetic energy is available near a source
Note 1 to entry: The emission characteristics and equipment-related precautionary measures are used instead of
operator exposure limits in this document, and are intended to result in a tolerable risk as defined in
ISO/IEC Guide 51.
Note 2 to entry: The source data used in this document is typically based on field properties of the accessible
emission, but high frequency fields are also characterised/limited by the particular conditions for dielectric heating
and processing.
Note 3 to entry: The energy is basically reactive where body-parts are present, i.e. non-radiating (evanescent).
[SOURCE: IEC 60050-161:1990, 161-01-08, modified – The definition has been modified by
replacing the words "electromagnetic energy emanates from a source" by "electric, magnetic or
electromagnetic energy is available near a source" and notes to entry have been added.]
3.1.106
HF/MW transparency
property of a material having negligible absorption and reflection of high frequency or
microwave fields
Note 1 to entry: The relative permittivity of a microwave transparent material is usually less than 7 and the loss
factor is usually less than 0,015.
[SOURCE: IEC 60050-841:2004, 841-29-14, modified – In the definition, the word "microwaves"
has been replaced by "high frequency or microwave fields".]

3.1.107
prospective primary capacitive current area
part of the body in its most onerous position facing the live source
[SOURCE: IEC TS 62996:2017, 3.7, to be replaced by a technical report (TR) or by a revised
technical specification (TS)]
3.1.108
secondary contact area
live part or ground, with or without protective insulation, through which the current flows when
the primary contact area is being contacted or touched, or through the prospective primary
capacitive current area
[SOURCE: IEC TS 62996:2017, 3.10, to be replaced by a technical report (TR) or by a revised
technical specification (TS)]
3.1.109
spark discharge
transfer of current across an air gap prior to making contact with another conductive object at
a different potential
[SOURCE: IEC TR 63167:2018, 3.6]
3.1.110
reference surface
fictitious surface in the vicinity of mainly the entrance and exit ports, located as a consequence
of HF/MW leakage measurements of accessible emission
Note 1 to entry: See 9.1.1.103 for the practical specifications.
3.1.111
scenario
in numerical modelling, all relevant geometrical parts/components/body-parts, locations and
dimensions, all complex permittivities, boundary conditions, source characteristics, excitation
and operating frequency or frequency interval
3.2 Equipment and state of equipment
3.2.101
accessible emission
HF/MW leakage
electromagnetic, electric or magnetic field existing near the equipment where practically
relevant measurement results related to induced electric shock or body-part SAR are
considered possible
Note 1 to entry: Measurements of the field characteristics very close to a processing frequency source or a
mechanically accessible part of the equipment are considered unreliable with regard to the possible specific
absorption rate (SAR) in a body-part located there. As a consequence, minimum distances between the field
measurement probe and mechanically accessible parts are to be defined, as is done in 9.1.1.103.
[SOURCE: IEC 60519-1:2020, 3.4.15, modified by addition of the necessity of the emission to be
measurable]
3.2.102
cover
structural feature of any part of the HF/MW equipment which can be opened or removed by the
use of a tool to provide access for routine maintenance, service, replacement of expendable
parts, etc.
– 12 – IEC 60519-6:2022 © IEC 2022
3.2.103
entrance port
exit port
openings in the HF/MW enclosure through which the HF/MW load moves
3.2.104
HF applicator
device comprising the heating capacitive device or work electrodes with their fixing and
positioning systems, impedance matching circuits (if not situated in the generator assembly)
and, where necessary, protective and screening devices, means for transport, supply and
ventilation
3.2.105
HF enclosure
MW enclosure
enclosure intended to confine the electromagnetic, electric or magnetic energy to a defined
region
Note 1 to entry: Examples are a microwave cavity, door seals and waveguides.
Note 2 to entry: HF/MW barriers mounted outside the HF/MW enclosure are not considered to be a part of it.
[SOURCE: IEC 60050-841:2004, 841-29-20, modified by extension to lower-frequency fields]
3.2.106
high frequency generator
HF generator
source used to produce electromagnetic energy in the processing frequency range from 3 MHz
to 300 MHz
3.2.107
HF/MW interlock
interlock that prevents unacceptably high HF/MW emission
3.2.108
HF/MW load
objects in the treatment region of the HF/MW applicator
Note 1 to entry: This includes the workload as well as an intermediate electromagnetic ionised gas (plasma), and
any containers, as well as test loads for determination of HF/MW generator characteristics.
[SOURCE: IEC 60050-841:2004, 841-29-12, modified by extension to lower-frequency fields]
3.2.109
MW applicator
structure which applies the electromagnetic energy to the MW load
EXAMPLE A microwave cavity, a plasma source, or a handheld applicator
[SOURCE: IEC 60050-841:2004, 841-29-11, modified by addition of examples]
3.2.110
microwave cavity
space enclosed by inner metal walls and a door or an access opening and in which the micro-
wave load is placed
[SOURCE: IEC 60050-841:2004, 841-29-19, modified by use of the term microwave load]

3.2.111
microwave generator
MW generator
source used to produce electromagnetic energy in the processing frequency range from
300 MHz to 300 GHz
3.3 Parts and accessories
3.3.101
HF/MW barrier
barrier which is HF/MW transparent and does not influence the HF/MW field
Note 1 to entry: HF/MW barriers may be fixed to the equipment or not; in either case they are considered to be a
part of the installation.
Note 2 to entry: Devices such as an array of metal chains or hinged metal plates at entrance and exit ports intended
to reduce HF/MW leakage are not considered HF/MW barriers.
Note 3 to entry: The transparency also applies to guards.
3.3.102
HF screen
screen that, when removed, significantly increases the HF emission in the region which it is
intended to protect
Note 1 to entry: HF screens are reflective or absorptive, or both.
Note 2 to entry: HF screens may be fixed to the equipment or not; in either case they are considered to be a part
of the installation.
Note 3 to entry: Devices such as hinged metal plates at entrance and exit ports intended to reduce HF emission
are considered to be HF screens.
Note 4 to entry: The non-transparency also applies to obstacles.
3.3.103
maintenance door
all structural features of any part of the MW/HF equipment which can be opened or removed
without the use of a tool to provide access to locations other than the HF/MW applicator or
microwave cavity
3.3.104
test load
artificial power-absorbing device used for testing HF/MW generators with similar equivalent
impedance to the actual HF/MW load for which the equipment is designed, to allow the output
power to be applied under normal operation in the absence of the actual load
4 Classification and subdivision of equipment and installations
This clause of Part 1 is applicable with the following.
4.1 Classification by processing frequency
Modifications:
4.1.101 High frequency in this document means rated processing frequencies between
3 MHz and 300 MHz, and microwave means processing frequencies which are higher than
300 MHz.
NOTE Dielectric heating and processing frequencies less than 3 MHz are not considered industrially feasible.

– 14 – IEC 60519-6:2022 © IEC 2022
4.1.102 For HF dielectric heating and processing frequencies up to 300 MHz, field
measurement principles, methods and emission limits are specified in Annex BB. Magnetic
fields shall also be measured for HF processing frequencies 100 MHz and higher, and both
the maximum electric and magnetic emission levels shall then be complied with. For HF
processing frequencies less than 100 MHz, contact currents are measured as an alternative
to magnetic field measurements.
NOTE There are relaxations of the electric field emission levels as specified in Clause BB.6 for equipment with
processing frequencies less than 41 MHz, determined to fulfil the criteria in BB.3.2 for dielectric heating and
processing.
4.1.103 For microwave processing frequencies from 800 MHz to 6 GHz, probes sensing the
electric field only are accepted. Measurement principles, methods and electromagnetic
emission limits are specified in Annex CC. IEC 62311 applies for lower and higher microwave
processing frequencies.
5 Risk assessment
This clause of Part 1 is applicable.
6 General provisions
This clause of Part 1 is applicable except as follows:
6.4 Physical environment and operating conditions for electrical equipment caused by
operation of the processing equipment
Additions to 6.4.2:
6.4.2.101 Unintended conveyor stops during HF/MW operation and operation under conditions
which are not normal operation are defined as a single fault condition. Requirements for these
kinds of abnormal operation regarding excessive heating of the HF/MW load are in 11.101;
requirements for HF and microwave leakage are in 9.1.103, and for interlock functions in
14.4.101 to 14.4.103.
6.4.2.102 The following applies to HF equipment: Operation without a load or interruption of
the flow of HF loads is a case of normal operation for some types of equipment and shall not
result in a non-compliant HF emission. Compliance with this requirement can be checked by
detection of the HF emission or by the equipment operation being stopped by other means.
Defeating the safety circuit is considered to be a single fault condition. The requirements on HF
emission levels for this condition are those for normal operation in 9.1.1.103.
6.4.2.103 The following applies to MW equipment: no-load operation of MW equipment and
interruption of the flow of MW load(s) shall be protected against. Compliance with this
requirement can be checked by detecting the MW emission by an active leakage monitor which
switches off the MW generator in order for the requirements of Annex CC to be fulfilled.
Defeating the safety sensor circuit is considered a single fault condition. Requirements on MW
emission levels for this condition are in 9.1.1.102.
6.4.2.104 Any single electrical or mechanical fault in the HF/MW equipment under normal
operation shall not result in energising the HF/MW generator.
NOTE 1 A mechanical fault in an array of metal chains or hinged metal plates at entrance and exit ports intended
to reduce MW or HF field leakage is a single fault condition.
NOTE 2 Compliance with this requirement can be checked by inspection of the circuit diagrams and/or with the
measurements as specified in Annex BB or Annex CC.

For the purpose of testing, all maintenance doors, means of access and HF/MW barriers and
HF screens are removed or opened, except those which incorporate HF/MW interlocks which
prohibit generation of HF/MW power when r
...