IEC 61347-2-10:2024

IEC 61347-2-10 ®
Edition 2.0 2024-05
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Lamp controlgear –
Controlgear for electric light sources – Safety –
Part 2-10: Particular requirements for electronic invertors
and convertors for high-frequency operation of cold start
tubulardischarge lamps (neon tubes) Particular requirements – Electronic
controlgear for high-frequency operation of tubular cold-cathode discharge
lamps (neon tubes)
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IEC 61347-2-10 ®
Edition 2.0 2024-05
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Lamp controlgear –
Controlgear for electric light sources – Safety –
Part 2-10: Particular requirements for electronic invertors
and convertors for high-frequency operation of cold start
tubulardischarge lamps (neon tubes) Particular requirements – Electronic
controlgear for high-frequency operation of tubular cold-cathode discharge
lamps (neon tubes)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.140.99  ISBN 978-2-8322-8917-4
– 2 – IEC 61347-2-10:2024 RLV © IEC 2024
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
4 General requirements . 11
5 General notes on tests . 11
6 Classification . 11
7 Marking . 12
7.1 Marking and information . 12
7.1.1 Items to be marked Mandatory marking . 12
7.1.2 Durability and legibility of marking Information to be provided . 12
7.2 Durability and legibility . 13
7.3 Built-in controlgear . 13
8 Terminals . 13
9 Provisions for Earthing . 13
10 Protection against accidental contact with live parts . 13
11 Moisture resistance and insulation . 14
12 Electric strength . 14
13 Thermal endurance test for windings . 14
14 Normal conditions . 14
15 Abnormal conditions . 15
16 Fault conditions . 16
17 Construction . 16
18 Creepage distances and clearances . 16
19 Protective circuits . 17
19.1 General . 17
19.2 Earth-leakage protection . 17
20 Screws, current-carrying parts and connections . 19
21 Resistance to heat, fire and tracking . 19
22 Resistance to corrosion . 19
23 No-load rated output voltage and rated output current . 19
24 Applicable annexes of IEC 61347-1 . 20
Annex AAnnex I (normative) Measurement of current and voltages in the output
circuits of electronic controlgear for neon tubes . 23
IA.1 General . 23
IA.1.1 Information to be provided by manufacturers . 23
IA.1.2 Measurement of output voltage and current . 23
IA.1.3 Amplitude modulations. 24
IA.1.4 Spikes and high-frequency harmonics. 24
IA.1.5 Test conditions . 24
IA.2 Instrumentation . 24
IA.3 Measurements . 25
IA.3.1 Measurement of no-load output voltage . 25

IA.3.2 Measurement of output current . 26
IA.3.3 Measurement of earth fault currents . 26
Annex B (informative) Schedule of more onerous requirements . 27
Bibliography . 28

– 4 – IEC 61347-2-10:2024 RLV © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LAMP CONTROLGEAR –
CONTROLGEAR FOR ELECTRIC LIGHT SOURCES – SAFETY –

Part 2-10: Particular requirements for electronic invertors
and convertors for high-frequency operation of cold start
tubulardischarge lamps (neon tubes)
Particular requirements – Electronic controlgear for high-frequency
operation of tubular cold-cathode discharge lamps (neon tubes)

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
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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
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the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition IEC 61347-2-10:2000+AMD1:2008 CSV. A vertical bar
appears in the margin wherever a change has been made. Additions are in green text,
deletions are in strikethrough red text.

IEC 61347-2-10 has been prepared by subcommittee 34C: Auxiliaries for lamps, of IEC
technical committee 34: Lighting. It is an International Standard.
This second edition cancels and replaces the first edition published in 2000 and
Amendment 1:2008. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) introduction of dated references as appropriate;
b) clarification of sample item numbers.
The text of this International Standard is based on the following documents:
Draft Report on voting
34C/1584/CDV 34C/1592/RVC
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/publications.
This document is intended to be used in conjunction with IEC 61347-1:2015 and
IEC 61347-1:2015/AMD1:2017. Where the requirements of any of the clauses of
IEC 61347-1:2015 and IEC 61347-1:2015/AMD1:2017 are referred to in this document by the
phrase "IEC 61347-1:2015, Clause n and IEC 61347-1:2015/AMD1:2017, Clause n apply", this
phrase is interpreted as meaning that all the requirements of the clause in question of
IEC 61347-1:2015 and IEC 61347-1:2015/AMD1:2017 apply, except any which are clearly
inapplicable to the specific type of controlgear covered by this document.
NOTE In this document, the following print type is used:
– compliance statements: in italic type.
A list of all parts in the IEC 61347 series, published under the general title Controlgear for
electric light sources – Safety, can be found on the IEC website.
Future documents in this series will carry the new general title as cited above. Titles of existing
documents in this series will be updated at the time of the next edition.

– 6 – IEC 61347-2-10:2024 RLV © IEC 2024
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IMPORTANT – The "colour inside" logo on the cover page of this document 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
This part of IEC 61347, and the parts which make up IEC 61347-2, in referring to any of the
clauses of IEC 61347-1, specify the extent to which such a clause is applicable and the order
in which the tests are to be performed; they also include additional requirements, as necessary.
All parts which make up IEC 61347-2 are self-contained and, therefore, do not include
references to each other.
Where the requirements of any of the clauses of IEC 61347-1 are referred to in this standard
by the phrase ”The requirements of clause n of IEC 61347-1 apply”, this phrase is interpreted
as meaning that all requirements of the clause in question of part 1 apply, except any which are
clearly inapplicable to the specific type of lamp controlgear covered by this particular part of
IEC 61347-2.
The technical requirements in this document compared to IEC 61347-2-10:2000 and
IEC 61347-2-10:2000/AMD1:2008 are essentially unchanged. Nevertheless, a new edition of
this document could not be avoided, as without the introduction of dated references to
IEC 61347-1:2015 and IEC 61347-1:2015/AMD1:2017, the fourth edition of IEC 61347-1:—
would have been implicitly applicable due to the undated nature of the references to
IEC 61347-1 in IEC 61347-2-10:2000 and IEC 61347-2-10:2000/AMD1:2008.
This document, in referring to any of the clauses of IEC 61347-1:2015 and
IEC 61347-1:2015/AMD1:2017, specifies the extent to which such a clause is applicable.
Additional requirements are also included, as necessary.
In order to check the safety of controlgear, it is necessary to check their performance. However,
since no standardization of the characteristics of neon tubes exists, reference loads are
specified in this document to ensure reproducible test results.

___________
Fourth edition under preparation. Stage at the time of publication IEC FDIS 61347-1:2024.

– 8 – IEC 61347-2-10:2024 RLV © IEC 2024
LAMP CONTROLGEAR –
CONTROLGEAR FOR ELECTRIC LIGHT SOURCES – SAFETY –

Part 2-10: Particular requirements for electronic invertors
and convertors for high-frequency operation of cold start
tubulardischarge lamps (neon tubes)
Particular requirements – Electronic controlgear for high-frequency
operation of tubular cold-cathode discharge lamps (neon tubes)

1 Scope
This part of IEC 61347 specifies particular safety requirements for electronic invertors and
convertors controlgear for high-frequency operation of tubular cold-cathode discharge lamps
used in signs and luminous discharge tube installations and operating with an output voltage
exceeding 1 000 V but not exceeding 10 000 V for direct connection to DC or AC supply
voltages not exceeding 1 000 V (at 50 Hz or 60 Hz or 1 000 V d.c in case of alternating current).
NOTE 1 Historically, such types of controlgear were referred to as invertors or convertors.
NOTE 12 In Japan, the output voltage limit for the application of this document is set to 15 000 V is acceptable.
The requirements for two types of invertors and convertors, types A and B, are specified as
follows:
– Type A unit: an invertor or convertor operating within the frequency range 20 kHz to 50 kHz,
and having an output voltage (between terminals) not exceeding 5 000 V peak, a maximum
output current limited to 35 mA (r.m.s.) and 50 mA (peak value). The supply voltage does
not exceed 250 V at 50 Hz or 60 Hz or 250 V d.c.
NOTE 2 The output current of a type A unit may be considered as not presenting an electric shock hazard due to
the limits on the current and frequency range.
NOTE 3 In Japan, the output voltage of 15 000 V is acceptable.
– Type B unit: an invertor or convertor having a no-load output voltage not exceeding 5 000 V
to earth or 10 000 V between terminals, operating within the frequency range 10 kHz to
100 kHz with a maximum output current limited to 200 mA (r.m.s.) and 400 mA (peak value).
NOTE 4 Type B units require additional protection in the output circuit.
NOTE 5 In Japan, a type B unit exceeding 50 mA and/or the secondary grounded is not acceptable.
In order to check the safety of invertors or convertors, it is necessary to check their
performance. However, since no standardization of the characteristics of neon tubes exists,
reference loads are specified in this standard to ensure reproducible test results.
The rated maximum operating temperature of the winding, t , is not applicable to this standard.
w
This document applies for controlgear of type A and controlgear of type B, which are specified
as follows:
– Type A: controlgear operating within the frequency range 20 kHz to 50 kHz, and having an
output voltage not exceeding 5 000 V peak between terminals, with a maximum output
current limited to 35 mA (RMS) and 50 mA (peak value) and a supply voltage not exceeding
250 V.
NOTE 3 The output current of a type A unit can be considered as not presenting an electric shock hazard due
to the limits on the current and frequency range.

NOTE 4 In Japan, the output voltage of 15 000 V is acceptable.
– Type B: controlgear operating within the frequency range 10 kHz to 100 kHz and having a
no-load output voltage not exceeding 10 000 V between terminals or not exceeding 5 000 V
to earth, with a maximum output current limited to 200 mA (RMS) and 400 mA (peak value).
NOTE 5 In Japan, a type B controlgear providing an output current exceeding 50 mA is not acceptable.
2 Normative references
For the purpose of this part of IEC 61347, the normative references given in clause 2 of
IEC 61347-1 which are mentioned in this standard apply, together with the following 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 60417, Graphical symbols for use on equipment, available at https://www.graphical-
symbols.info/equipment
IEC 60598-1:2020, Luminaires – Part 1: General requirements and tests
IEC 61347-1:2015, Lamp controlgear – Part 1: General and safety requirements
IEC 61347-1:2015/AMD1:2017
ISO 3864:1984, Safety colours and safety signs
ISO 3864-1:2011, Graphical symbols – Safety colours and safety signs – Part 1: Design
principles for safety signs and safety markings
3 Terms and definitions
For the purpose of this part of IEC 61347, the definitions given in clause 3 of IEC 61347-1, with
the exception of definitions 3.14, 3.16 and 3.17 apply, together with the following:
For the purposes of this document, the terms and definitions given in IEC 61347-1 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
tubular cold-cathode discharge lamp
neon tube
discharge tube having cathodes which may be coated with an electron emitting material and
which, during the starting process without external heating, emits electrons by field emission.
tubular discharge lamp in which the light is produced by the positive column of a glow discharge
Note 1 to entry: These lamps have a low-pressure filling of a rare gas (or a mixture of rare gases) and possibly
mercury vapour. They can have an inside coating of fluorescent materials.

– 10 – IEC 61347-2-10:2024 RLV © IEC 2024
3.2
rated no-load rated output voltage
U
o
rated maximum rated voltage between the output terminals or the ends of the integral
connecting leads of the invertor or convertor connected to the rated supply voltage at rated
frequency with no load on the output circuit
Note 1 to entry: For sinusoidal wave forms, the rated no-load output voltage is the RMS value or the peak value
divided by square root of 2. For other waveforms, it is the RMS value or the equivalent value deduced from the peak
value, obtained by mathematical calculation.
Note 2 to entry: For the purposes of this document this definition overrules the one given in IEC 61347-1.
[SOURCE: IEC 61347-1:2015, 3.9, modified – The definition has been adapted for the purposes
of this document and the Notes to entry have been added.]
3.3
invertor
electric energy transducer that converts direct current to alternating current
3.4
convertor
unit for the electronic conversion of AC supply at one frequency to an AC supply at another
frequency
3.5
earth-leakage protective device
device which removes the output power from an invertor or convertor the controlgear in the
event of an earth fault current flowing between any part of the output high-voltage circuit and
earth
3.6
open-circuit protective device
device which removes the output power from an invertor or convertor the controlgear in the
event of non-operation of the tube load or an interruption in the output high-voltage circuit
Note 1 to entry: An open-circuit protective device may operate by detecting an increase in the output voltage or by
other suitable means.
3.7
upper shut-down limit
output voltage of an invertor or convertor the controlgear at which an open-circuit protective
device operates
3.8
output high-voltage circuit
that part of the circuit consisting of
a) cables between the output terminals of the convertor or invertor controlgear and the
discharge tubes,
b) discharge tubes,
c) any series connections between the discharge tubes,
It does not include any internal components or wiring of the invertor or convertor. but not
including any internal components or wiring of the controlgear
3.9
sample
one or more sampling items intended to provide information on the population or on the material
provided by the manufacturer or responsible vendor

[SOURCE: IEC 60050-151:2001, 151-16-19, modified – "provided by the manufacturer or
responsible vendor" has been added.]
3.10
sample item
one of the individual items in a population of similar items, or a portion of material forming a
cohesive entity and taken from one place and at one time
[SOURCE: IEC 60050-151:2001, 151-16-18]
4 General requirements
IEC 61347-1:2015, Clause 4 applies.
For electronic lamp controlgear with means of protection against overheating, additionally
IEC 61347-1:2015, Annex C applies.
Provisions for the rated maximum temperature of the winding t , are not applicable.
w
5 General notes on tests
IEC 61347-1:2015, Clause 5, applies, together with the following:
– IEC 61347-1:2015, Annex H applies.
– One sample item shall be used for all tests, unless otherwise specified in the corresponding
clause.
To allow for parallel testing and reduced test times, additional sample items may be used
except where the outcome of the test can be affected by preceding tests, for example the
tests of Clause 11 and Clause 12.
Specially prepared sample items may be used where required.
For information on requalification of products compliant with the previous edition of this
document, i.e. IEC 61347-2-10:2000 and IEC 61347-2-10:2000/AMD1:2008, refer to Annex B.
6 Classification
IEC 61347-1:2015, Clause 6 applies, together with the following:
Invertors and convertors Additionally, controlgear shall be classified according to their rated
no-load output voltage, the rating of the operating frequency and output current range, as one
of the following:
a) type A invertor or convertor controlgear;
b) type B invertor or convertor controlgear.
Type B invertors or convertors controlgear may have more than one output. In this case, each
output shall comply with the above.

– 12 – IEC 61347-2-10:2024 RLV © IEC 2024
7 Marking
7.1 Marking and information
7.1.1 Items to be marked Mandatory marking
Electronic invertors and convertors for high-frequency operation of cold start tubular discharge
lamps shall be clearly and durably marked, in accordance with the requirements of 7.2 of
IEC 61347-1, with the following markings:
Controlgear, other than integral controlgear, shall be marked with the following:
– items a), b), c), d), e) and f) of IEC 61347-1:2015, 7.1 and IEC 61347-1:2015/AMD1:2017,
7.1;
– on independent electronic invertors and convertors controlgear, a warning notice for high
voltage, e.g. "HIGH VOLTAGE" and a symbol in the form of an arrow in accordance with
IEC 60417-6042:2010-11 and figure 1 of ISO 3864 ISO 3864-1:2011, Figure 3.
This marking shall be placed on the outside of the enclosure of the electronic invertor or
convertor controlgear so that it is clearly visible.
NOTE It is not necessary to mark integral invertors or convertors separately as their marking is the subject of
relevant sign or luminaire standards.
– type A or type B as applicable.
If the electronic invertor or convertor consists of more than one separate unit, the units providing
the output shall be marked with the necessary information about other associated units such as
DC power supplies or capacitors.
7.1.2 Durability and legibility of marking Information to be provided
In addition to the above mandatory marking, The following information, if applicable, shall be
given on the electronic invertor or convertor controlgear, or be made available in the
manufacturer's catalogue or similar:
– items h), k), m), n) and o) of IEC 61347-1:2015, 7.1;
– if the electronic invertor or convertor consists of more than one separate unit, the units
providing the output shall be marked with necessary information about other associated
units such as d.c power supplies or capacitors;
– the range and number of tube types, diameters and lengths recommended for the invertor
or convertor controlgear;
– where the invertor or convertor controlgear is not supplied with integral leads (tails), details
of the recommended cable types and maximum cable lengths;
– details of suitable types of mounting surfaces and recommended mounting arrangements;
– details of earthing arrangements, including connections to the invertor or convertor
controlgear output winding, where appropriate;
– details of any protective circuits incorporated in the invertor or convertor controlgear;
– the following nominal electrical characteristics:
1) output rated no-load output voltage. This marking shall be in the following terms:
• if the output terminal is not connected to an earthing terminal:
".kV" (e.g. 4 kV),
• if one output terminal is connected to an earthing terminal:
"E -.kV" (e.g. E – 4 kV),
• if the centre point of the output winding is referred to an earthing terminal:
". - E -.kV" (e.g. 3 – E – 3 kV);

NOTE In Japan, E -.kV and - E - kV are not used.
For type A units, this will be is equivalent to the peak value. For type B units, it will be
this is equivalent to the RMS value or 0,5 times the peak value, whichever is the greater
larger.
2) rated output current with rated load;
3) rated output frequency.
Where appropriate, the details in items 1) and 2) above shall be marked for each independent
output circuit of an invertor or convertor a controlgear.
7.2 Durability and legibility
IEC 61347-1:2015, 7.2 applies.
7.3 Built-in controlgear
For controlgear without an enclosure and classified as built-in (e.g. open printed circuit board
assembly), only items a) and b) according to IEC 61347-1:2015, 7.1 shall be marked on the
controlgear.
Other mandatory markings shall be provided as information to be given either on the controlgear
or made available in the manufacturer's catalogue or similar.
8 Terminals
IEC 61347-1:2015, Clause 8 and IEC 61347-1:2015/AMD1:2017, Clause 8 apply, together with
the following:
Invertors or convertors Controlgear provided with tails shall comply with the relevant
requirements of IEC 60598-1:2020.
9 Provisions for Earthing
IEC 61347-1:2015, Clause 9 applies, together with the following:
For type B invertors or convertors controlgear, the earthing terminal shall be connected to a
part of the output circuit except where
– the earthing terminal is connected to a part of the output circuit through means to detect
earth-fault currents, or
– there is no direct connection between any part of the output circuit and the earth terminal,
and for example, part(s) of that output circuit are referenced to earth potential by means of
the internal circuits.
Compliance is checked by inspection.
NOTE In Japan, this clause is not applicable.
10 Protection against accidental contact with live parts
IEC 61347-1:2015, Clause 10 and IEC 61347-1:2015/AMD1:2017, Clause 10 apply, together
with the following:
The remaining charge between terminals in the output circuit of an invertor or convertor a
controlgear following a worst case of disconnection shall not exceed 45 µC.

– 14 – IEC 61347-2-10:2024 RLV © IEC 2024
Compliance is checked by measurement.
Where part(s) of the output circuit of an invertor or convertor a controlgear is(are) not connected
to earth, or is(are) not referenced to earth by means of internal circuits, the insulation barrier
between the input and output circuits shall consist of double or reinforced insulation (see test
voltages in Clause 12).
Compliance is checked by the test of Clause 12 (see test voltages).
11 Moisture resistance and insulation
IEC 61347-1:2015, Clause 11 and IEC 61347-1:2015/AMD1:2017, Clause 11 apply, together
with the following:
For type A units controlgear, the capacitance between the output terminals and the metal foil
of not less than 100 cm area placed anywhere on the surface of the enclosure of the invertor
or convertor controlgear shall not exceed 50 pF. During the test the convertor shall not operate.
Compliance is checked by measurement.
12 Electric strength
IEC 61347-1:2015, Clause 12 applies, together with the following:
Test voltages
The test voltages for all invertors and convertors controlgear are:
– twice the rated input voltage plus 1 000 V on the input side, with the output circuits
connected to external metal parts;
– twice the no-load rated output voltage on the output side, the input circuits being connected
to external metal parts.
NOTE In Japan, 1,5 times the test voltage is approved.
IEC 60598-1:2020, Table 10.2 applies for independent invertors or convertors controlgear.
13 Thermal endurance test for windings
An invertor or convertor Controlgear or its support shall not, under normal or abnormal
conditions, have too high a temperature or impair safety.
Compliance is checked by the tests specified in Clause 14, Clause 15 and Clause 16.
14 Normal conditions
The invertor or convertor controlgear shall be installed in its normal operating position arranged
in accordance with the manufacturer's instructions and mounted as shown in IEC 61347-1:2015,
Figure H.1. The test shall be carried out in a draught-free enclosure as specified in IEC 61347-
1:2015, Annex F.
The invertor or convertor controlgear shall be operated with the tube load replaced by the
specified load resistor R (see Annex IA) and with nominal supply voltage.
– In the case of invertors or convertors controlgear which provide near constant current output,
the supply voltage shall be maintained at the nominal value until steady-state temperatures
are obtained.
– In the case of invertors or convertors controlgear which do not provide near constant current
output, adjustments shall be made to the supply voltage until the output current is the same
as the nominal value specified on the label of the invertor or convertor controlgear. The
output current is then maintained at this value until steady-state temperatures are obtained.
If the invertor or convertor controlgear has more than one output, the appropriate load
resistors (R ) shall be connected to each pair of output terminals.
During the test, the temperature on the relevant parts shall not exceed the values specified in
IEC 60598-1:2020, Table 12.1 and Table 12.2.
15 Abnormal conditions
The invertor or convertor controlgear shall be operated under the test conditions specified in
15.2, and according to the manufacturer's instructions (including heatsinks and spacers, if
specified) at the most onerous voltage between 90 % and 110 % of the rated supply voltage for
a period of 1 h. The test shall be carried out in a draught-free enclosure as specified in
IEC 61347-1:2015, Annex F.
The test shall be carried out with one of the following combination of conditions, whichever is
the most onerous. The time interval between tests shall not exceed 15 min.
a) Conditions 1) to 3) applied sequentially.
b) Conditions 2) and 3) applied simultaneously.
1) The output circuit(s) shall be short-circuited.
If there is more than one output circuit, all circuits shall be short-circuited at the same
time.
NOTE 1 If the invertor or convertor controlgear includes means to remove the shut off
output power in the event of a short-circuit of the output load, this test may be omitted.
2) The abnormal load resistor R (see Annex IA) shall be connected across the output
terminals. If the invertor or convertor controlgear has more than one output, the
appropriate abnormal resistors R shall be connected to each pair of output terminals at
the same time.
3) The invertor or convertor controlgear shall be mounted on a 1 mm thick metal sheet,
whose material shall be specified by the manufacturer.
If not specified, then either steel or aluminium (whichever provides the worst condition)
shall be used.
NOTE 2 In addition, other materials may be taken into consideration.
During and at the end of the tests specified in 15.2, the invertor or convertor controlgear shall
show no defect impairing safety, nor shall any smoke be produced.
The temperature of any part of the outer surface of an independent invertor or convertor
controlgear shall not exceed 90 °C. In addition, the output current and voltage shall not exceed
the values specified in Clause 23.

– 16 – IEC 61347-2-10:2024 RLV © IEC 2024
16 Fault conditions
IEC 61347-1:2015, Clause 14 and IEC 61347-1:2015/AMD1:2017, Clause 14 apply, together
with the following:
a) the output shall be short-circuited, or in the case of an invertor or convertor a controlgear
having short-circuit protection, the output shall be connected to resistor R as described in
Annex IA;
b) an earth fault of negligible impedance shall be applied on one or both of the output terminals.
The output current shall not exceed 1,5 times the value specified by the manufacturer in both
cases a) and b).
NOTE The test of b) need is not be applied applicable if there is no earth connection to any part
of the output circuit; or if the invertor or convertor controlgear includes means to remove the
shut off output power in the event of a short-circuit between one of the output terminals and
earth, in accordance with Clause 19.
17 Construction
IEC 61347-1:2015, Clause 15 applies, together with following:
Independent invertors or convertors of class II controlgear construction shall be provided with
an enclosure of insulating material only.
Compliance is checked by inspection.
The cable between the output terminals of an invertor or convertor a controlgear and the
discharge tube shall be of a type specified by the manufacturer of the invertor or convertor
controlgear and shall satisfy the following requirements:
a) be suitable for operation at high frequency;
b) be suitable for operation at the output voltage of the invertor or convertor controlgear.
18 Creepage distances and clearances
IEC 61347-1:2015, Clause 16 and IEC 61347-1:2015/AMD1:2017, Clause 16 apply, together
with the following:
Creepage distances and clearances in the output circuit, whether the invertor or convertor
controlgear is installed in dry or damp situations, shall be not less than the following, expressed
in millimetres:
– minimum creepage distance d = 12 + 6 U
o
– minimum clearance c = 9 + 4,5 U
o
where
U is the rated no-load rated output voltage of the invertor or convertor controlgear supplying
o
the circuit in kilovolts.
The distance through insulation shall be dimensioned according to the application of the
insulation and the working voltage (exceeding 50 V RMS or 71 V peak or DC) and in accordance
with the following:
– supplementary insulation shall have a minimum thickness of 0,4 mm;

– reinforced insulation shall have a minimum thickness of 0,4 mm when not subjected to any
mechanical stress which, at nominal operating temperature, would be likely to lead to
deformation or deterioration of the insulating material.
NOTE Under mechanical stress conditions, it may can be necessary to increase the thickness.
Compliance is checked by measurement and, where specified, by electric strength tests.
19 Protective circuits
Protective circuits in type B invertors and convertors shall comply with the requirements of 19.1,
19.2 and 19.3.
19.1 General
Type A controlgear may, and type B invertors or convertors controlgear shall include earth-
leakage protection to remove the shut off output power in the event of an earth fault occurring
in the output circuits. Protection shall comply with 19.5. If provided, 19.2 applies.
Open circuit protection may be provided. If provided, 19.3 applies.
19.2 If provided, the open-circuit protection of the type B invertors or convertors shall remove
the output power in the event of a disconnection or tube failure occurring in the output circuits.
Protection shall comply with 19.6.
19.3 After an earth fault or open circuit has caused the protective device in an invertor or
convertor to operate, it shall remain as it is until the mains supply is also switched off. When
the mains supply is switched on again, the protective device to remove the output power shall
automatically reset. If the earth-leakage or open-circuit fault is still present at the time of the
reset, the protective device shall operate in accordance with 19.5.3 or 19.6.3.
NOTE Special arrangements may be required in circuits with animation to ensure that any protective device does
not continue to reset.
19.4 Compliance is checked by carrying out the relevant tests in accordance with 19.5 and 19.6.
19.2 Earth-leakage protection
The earth-leakage current shall be measured in accordance with Annex A.
If provided, an earth-leakage protective device shall comply with the requirements of 19.5.1
to 19.5.3.
19.5.1 Earth leakage current
The earth leakage current shall be measured in accordance with Annex I.
19.5.2 Accidental contact
In the event of accidental contact between the high-voltage circuit and earth, the earth-leakage
protective device shall remove the output power of the invertor or convertor.
19.5.3 Earth-lea
...