IEC 60598-2-20:2010

Luminaires - Part 2-20: Particular requirements - Lighting chains

IEC 60598-2-20:2010 specifies requirements for lighting chains fitted with series- or parallel- or a combination of series/parallel-connected incandescent lamps for use either indoors or outdoors on supply voltages not exceeding 250 V. This third edition cancels and replaces the second edition published in 1996, its Amendment 1 (1998), its Amendment 2 (2002) and the interpretation sheets of March 2001 (1) and July 2003 (2 and 3). This third edition is based on the second edition, its Amendments 1 and 2 and the interpretation sheets of March 2001 (1) and July 2003 (2 and 3) and incorporates some changes relating to 20.7.15. This third edition constitutes a minor revision.
This publication is to be read in conjunction with IEC 60598-1:2008.

Luminaires - Partie 2-20: Règles particulières - Guirlandes lumineuses

La CEI 60598-2-20:2010 spécifie les exigences applicables aux guirlandes lumineuses de lampes à incandescence montées en série, en parallèle ou en combinaison série/parallèle pour emploi à l'intérieur ou à l'extérieur, pour des tensions d'alimentation ne dépassant pas 250 V. Cette troisième édition annule et remplace la deuxième édition parue en 1996, l'amendement 1 (1998), l'amendement 2 (2002) et les feuilles d'interprétation de mars 2001 (1) et juillet 2003 (2 et 3). Cette troisième édition se base sur la deuxième édition, ses amendements 1 et 2 et les feuilles d'interprétation de mars 2001 (1) et juillet 2003 (2 et 3) et incorpore certains changements concernant 20.7.15. Cette troisième édition constitue une révision mineure.
Cette publication doit être lue conjointement avec la CEI 60598-1:2008.

General Information

• Status: Published
• Publication Date: 10-Feb-2010
• ICS: 29.140.40 - Luminaires
• Technical Committee: SC 34D - Luminaires
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 25-Nov-2014

Relations

• Revised: IEC 60598-2-20:2014 - Luminaires - Part 2-20: Particular requirements - Lighting chains
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60598-2-20
®
Edition 3.0 2010-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Luminaires –
Part 2-20: Particular requirements – Lighting chains

Luminaires –
Partie 2-20: Règles particulières – Guirlandes lumineuses

IEC 60598-2-20:2010

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---------------------- Page: 2 ----------------------
IEC 60598-2-20
®
Edition 3.0 2010-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Luminaires –
Part 2-20: Particular requirements – Lighting chains

Luminaires –
Partie 2-20: Règles particulières – Guirlandes lumineuses

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
R
CODE PRIX
ICS 29.140.40 ISBN 978-2-88910-210-5
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – 60598-2-20 © IEC:2010
CONTENTS
FOREWORD.3
20.1 Scope.5
20.2 Normative references .5
20.3 General test requirements .6
20.4 Definitions .6
20.5 Classification of luminaires .6
20.6 Marking .6
20.7 Construction .7
20.8 Creepage distances and clearances.10
20.9 Provisions for earthing .10
20.10 Terminals .10
20.11 External and internal wiring.10
20.12 Protection against electric shock.12
20.13 Endurance tests and thermal tests .16
20.14 Resistance to dust and moisture .17
20.15 Insulation resistance and electric strength.17
20.16 Resistance to heat, fire and tracking .17
Annex A (informative) Tumbling barrel test .18
Bibliography .19

Figure 1 – Example of a suitable connection for lighting chains.14
Figure 2 – Example of test device suitable for checking security of lampholder contacts .15
Figure 3 – Example of test device suitable for winding a flexible pipe.16

Table 1 – Characteristics of the lighting chains .11

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60598-2-20 © IEC:2010 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

LUMINAIRES –

Part 2-20: Particular requirements –
Lighting chains


FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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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.
International Standard IEC 60598-2-20 has been prepared by subcommittee 34D: Luminaires,
of IEC technical committee 34: Lamps and related equipment
This third edition cancels and replaces the second edition published in 1996, its Amendment 1
(1998), its Amendment 2 (2002) and the interpretation sheets of March 2001 (1) and July 2003
(2 and 3). This third edition is based on the second edition, its Amendments 1 and 2 and the
interpretation sheets of March 2001 (1) and July 2003 (2 and 3) and incorporates some
changes relating to 20.7.15. This third edition constitutes a minor revision.
This publication is intended to be read in conjunction with IEC 60598-1: Luminaires – Part 1:
General requirements and tests. It was established on the basis of the seventh edition (2008)
of that standard.

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– 4 – 60598-2-20 © IEC:2010
The text of this standard is based on the following documents:
FDIS Report on voting
34D/946/FDIS 34D/955/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
NOTE In this standard, the following print types are used:
– requirements: in roman type;
– test specifications: in italic type;
– notes: in small roman type.
The following differences exist in the countries indicated below:
20.11.1: In the USA, the requirements for the cables are different.
A list of all parts of the IEC 60598 series, under the general title: Luminaires, can be found on
the IEC website.
The committee has decided that the contents of this publication will remain unchanged until the
stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to
the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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60598-2-20 © IEC:2010 – 5 –
LUMINAIRES –

Part 2-20: Particular requirements –
Lighting chains



20.1 Scope
This part of IEC 60598 specifies requirements for lighting chains fitted with series- or parallel-
or a combination of series/parallel-connected incandescent lamps for use either indoors or
outdoors on supply voltages not exceeding 250 V.
NOTE 1 A Christmas tree chain is an example of a lighting chain fitted with series or series/parallel connected lamps.
A chain for illuminating ski-tracks or promenades is an example of a lighting chain fitted with parallel connected
lamps.
NOTE 2 For lighting chains fitted with lampholders of the push-in type, the appropriate requirements of this part of
IEC 60598 apply.
NOTE 3 In some countries, the term "strings" is used instead of "chains".
NOTE 4 For lighting chains with non-standardised lamps (e.g. lamps of the push-in type) the lamps are regarded
as a part of the lighting chain and consequently included in the testing (and thereby in the certificate, if any).
20.2 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 60083, Plugs and socket-outlets for domestic and similar general use standardized in
member countries of IEC
IEC 60227 (all parts), Polyvinyl chloride insulated cables of rated voltages up to and including
450/750 V
)
1
IEC 60238:2004, Edison screw lampholders
Amendment 1 (2008)
IEC 60245 (all parts), Rubber insulated cables – Rated voltages up to and including 450/750 V
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60598-1:2008, Luminaires – Part 1: General requirements and tests
IEC 60811-3-1:1985, Common test methods for insulating and sheathing materials of electric
cables – Part 3: Methods specific to PVC compounds – Section One: Pressure test at high
temperature – Tests for resistance to cracking
Amendment 1 (1994)
Amendment 2 (2001)
IEC 61184, Bayonet lampholders
___________
)
1
 There exists a consolidated edition 8.1 (2008) that comprises IEC 60238 (2004) and its Amendment 1 (2008).

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– 6 – 60598-2-20 © IEC:2010
IEC 61347-2-11, Safety of lamp controlgear – Part 2-11: Particular requirements for
miscellaneous electronic circuits used with luminaires
20.3 General test requirements
The provisions of section 0 of IEC 60598-1 apply. The tests described in each appropriate
section of IEC 60598-1 shall be carried out in the order listed in this part of IEC 60598.
20.4 Definitions
For the purposes of this document, the definitions given in section 1 of IEC 60598-1 apply
together with the following definitions.
20.4.1
lighting chain
luminaire comprising an assembly of series-connected lampholders, parallel-connected lamp-
holders or series/parallel-connected lampholders and interconnecting insulated conductors
NOTE 1 For lighting chains with non-standardised lamps (e.g. lamps of the push-in type) the lamps are regarded
as part of the chain.
NOTE 2 For lighting chains with non-removable lamps, the lamps are regarded as part of the chain.
NOTE 3 A lighting chain may incorporate control devices (e.g. flasher units, see 20.7.16).
20.4.2
sealed chain
a lighting chain enclosed in a rigid or flexible insulating translucent pipe or tube, sealed at the
ends and having no joints
20.5 Classification of luminaires
Luminaires shall be classified in accordance with the provisions of section 2 of IEC 60598-1
together with the requirements of 20.5.1 and 20.5.2.
NOTE As lighting chains are mandatorily required to be suitable for mounting on normally flammable surfaces they
do not require F marking nor provision of a warning notice.
20.5.1 According to the type of protection against electric shock, lighting chains shall be
classified as Class II or Class III.
20.5.2 According to the degree of protection against dust and moisture, lighting chains for
outdoor use shall be classified as "of rain-proof, splash-proof, jet-proof or watertight
construction".
20.6 Marking
The provisions of section 3 of IEC 60598-1 apply together with the requirements of 20.6.1
and 20.6.2.
20.6.1 The following information shall be marked on the lighting chains.
a) Lighting chains shall be marked with the type reference or the electrical data of the lamps
and with the rated voltage of the complete chain. Where it is impractical to mark this
information on the lighting chain, the information shall be marked on a durable non-
removable sleeve or label fitted to the cable.
b) Lighting chains shall be accompanied by the substance of the following warnings:
1) do not remove or insert lamps while the chain is connected to the supply;

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60598-2-20 © IEC:2010 – 7 –
2) for series-connected lamps, replace failed lamps immediately by lamps of the same
rated voltage and wattage to prevent overheating; this requirement does not apply to
sealed chains;
3) do not connect the chain to the supply while it is in the packing unless the packing has
been adapted for display purposes;
4) for series-connected lamps where fused lamps are used to ensure compliance with
20.13.3 hereafter, do not replace a fused lamp with a non-fused lamp [see item e)].
5) ensure all lampholders are fitted with a lamp.
c) Ordinary lighting chains shall additionally be accompanied by the substance of the following
information:
"FOR INDOOR USE ONLY"
Lighting chains which rely on gaskets to provide the specified degree of protection against
dust and moisture shall additionally be accompanied by the substance of the following
information:
"WARNING – THIS LIGHTING CHAIN MUST NOT
BE USED WITHOUT ALL GASKETS BEING IN PLACE"
d) Lighting chains not intended for interconnection shall in addition be accompanied by the
substance of the following warning:
"Do not connect this chain electrically to another chain."
e) Lighting chains fitted with fused lamps to ensure compliance with 20.13.3 shall be accom-
panied by information indicating the means for identification of fused lamps (see 20.6.3).
NOTE For the purpose of this subclause, a fused lamp is a lamp designed so as to break the circuit in the
event of an overcurrent either by means of a separate fuse incorporated within the lamp or by any other means
e.g. a special filament.
f) Lighting chains with non-standardised lamps shall be accompanied by information
indicating that replacement lamps must be of the same type as delivered or of a type
specified by the manufacturer (see 20.6.2).
g) Lighting chains provided with non-replaceable lamps shall be accompanied by the
information that the lamps are not replaceable.
The information required under items b)3), f) and g) shall be indicated on the packing.
20.6.2 The following information shall be marked on the lampholder or on the cable, or on a
durable non-removable sleeve or label fitted to the cable.
a) Mark of origin (this may take the form of a trade mark, the manufacturer’s identification
mark or the name of the responsible vendor).
b) Symbol for class II or class III, if applicable.
c) Marking for degree of protection against dust and moisture, if applicable, or warning that
the chain is for indoor use only.
d) Rated voltage of class III chains.
e) Voltage and wattage of replacement lamps.
f) Use only replacement lamps of the same kind provided with this lighting chain.
20.6.3 Fused lamps used to ensure compliance with 20.13.3 shall have a suitable means of
identification, such as a special colour.
20.7 Construction
The provisions of section 4 of IEC 60598-1 apply together with the requirements of 20.7.1
to 20.7.16.

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20.7.1 Edison screw lampholders E10, E14 and E27 shall meet the requirements
of IEC 60238.
Bayonet lampholders shall meet the requirements of IEC 61184.
In lighting chains where non-standardised lamps (e.g. lamps of the push-in type) are used, the
lamps are regarded as parts of the lighting chain and tested accordingly.
E5 and similar small lampholders of the push-in type shall meet the requirements of the
appropriate clauses of IEC 60238.
In lighting chains fitted with parallel-connected lamps, E27 and B22 lampholders with insulation
piercing contacts shall meet the requirements listed in this part of IEC 60598.
20.7.2 Clause 4.6 of section 4 of IEC 60598-1 referring to terminal block does not apply.
20.7.3 Clause 4.7 of section 4 of IEC 60598-1 referring to terminals and supply connections
applies together with the following requirement:
The method of connection of wiring, external or internal, to components of chains shall give
reliable electrical contact over the service life of the component.
Compliance is checked by inspection and by carrying out the tests of this standard.
20.7.4 Only 4.11.4 and 4.11.5 of 4.11 of section 4 of IEC 60598-1, referring to electrical
connections and current-carrying parts, apply.
20.7.5 Gaskets used to provide the specified degree of protection against dust and moisture
of lighting chains for outdoor use shall be weather resistant. Such gaskets shall remain in place
on the chain when the lamp is removed and shall fit tightly round the inserted lamp.
Compliance shall be checked by inspection and by manual test.
No requirements are specified at present for checking the weather resistance of gaskets.
20.7.6 Compliance with the mechanical strength requirements of Clause 4.13 of section 4 of
IEC 60598-1 for Edison screw lampholders, and small lampholders of the push-in type shall be
checked by the tests given in Clause 15 of IEC 60238.
The tests are made on three samples of the lampholder without the lamp inserted. After the
test, the relevant compliance requirements of Clause 4.13 of section 4 of IEC 60598-1 shall be
met.
20.7.7 E5 and E10 lampholders and similar small lampholders of the push-in type shall be
used only if the rated voltage of each lamp does not exceed:
– for E5 and similar small lampholders 25 V;
– for series connected E10 and similar small lampholders 60 V;
– for parallel connected E10 lampholders 250 V.
Compliance is checked by inspection.

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60598-2-20 © IEC:2010 – 9 –
20.7.8 For lighting chains fitted with series-connected lamps, resistors, if any, for bridging the
lamp filaments shall be contained within the lamps. The protection against electric shock and
fire shall not be impaired when these resistors are functioning.
Compliance is checked by inspection and, where appropriate, by a test during which the
filaments of the lamps are interrupted.
20.7.9 Flasher units forming an integral part of the lighting chain, shall be enclosed in non-
flammable insulating material; they shall be securely fixed to the cable of the chain.
Compliance is checked by inspection and, for the non-flammability of the insulating material, by
the test of 20.16.
20.7.10 No requirement.
20.7.11 Lampholders for replaceable push-in lamps shall have a body of insulating material.
Compliance is checked by inspection.
20.7.12 The lamp (bulb) glass of push-in lamps shall not rotate in relation to the lamp cap and
the lamp cap shall not rotate in relation to the lampholder.
Compliance is checked by applying a torque of 0,025 Nm for 1 min between the glass envelope
and the lampholder. No displacement shall then occur between the parts during the test.
20.7.13 Replaceable push-in type lamps shall remain in the seated position when the lamp is
subjected to a pull force of up to 3 N. Replaceable push-in type lamps shall make electrical
contact with the lampholder contacts by applying a push-in force of between 3 N and 10 N
(under consideration). Withdrawal of the lamp from the holder shall be effected when subjected
to a pull force of between 3 N and 10 N (under consideration).
Non-replaceable lamps shall withstand a pull force of 10 N ± 1 N during which the lamp shall
remain seated and shall not have become unsafe.
During each application of the specified forces, no damage shall occur impairing safety and in
particular no breakage or separation of the lamp glass envelope from the lamp cap shall take
place.
Compliance is checked on a new sample by manual test, by measurement of the forces and by
inspection.
The sample is then placed in an oven at a temperature of 120 °C ± 5 °C for 2 h (under
consideration) following which it is allowed to cool down to room temperature.
The sample is then re-submitted to the same tests, requirements and compliance criteria as
those specified for the sample before the heating treatment.
20.7.14 Sealed lighting chains shall have adequate mechanical strength.
For rigid sealed lighting chains, compliance is checked by subjecting the pipe 45 times to each
of the following tests carried out in turn:
a) a pull of 60 N, the stress being applied to the ends of the pipe, without jerks, for 1 min;
b) a torque of 0,15 Nm, the stress being applied to the ends of the pipe in the most
unfavorable direction (alternatively in cases of doubt) without jerks for 1 min.

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– 10 – 60598-2-20 © IEC:2010
For flexible sealed lighting chains, compliance is checked by the tests of a) and b) above
followed by the additional test below:
Test:
Wind the pipe on a cylinder of 250 mm diameter with a pull of 60 N for the number of
operations and at the ambient temperature given below:
– for chains having an IP number up to and including 20 10 times at 25 °C ± 5 °C
– for chains having an IP number over 20 10 times at 25 °C ± 5 °C

followed by
10 times at –15 °C ± 5 °C
After the test, the pipe shall show no damage affecting the safety of the chain and shall comply
with the electric strength test of Clause 20.15 applied between live parts and the body.
NOTE 1 Failure of lamps during the test is permitted.
NOTE 2 An example of a test device suitable for winding a flexible pipe is given in Figure 3.
20.7.15
The lamp bulbs in lighting chains shall meet the mechanical requirements of Subclause 4.13.1
of IEC 60598-1 using an impact energy of 0,2 Nm when:
a) the lamps are non-removable;
or
b) the lamps are non-standardized and parallel connected.
20.7.16 Any electronic control device (e.g. flasher units) shall, in addition to the requirements
of this standard, comply with the requirements of IEC 61347-2-11.
Compliance is checked by carrying out the relevant tests.
20.8 Creepage distances and clearances
The provisions of section 11 of IEC 60598-1 apply except that for Edison screw lampholders
and small lampholders of the push-in type, Clause 17 of IEC 60238 applies.
20.9 Provisions for earthing
The provisions of section 7 of IEC 60598-1 do not apply.
20.10 Terminals
The provisions of section 15 of IEC 60598-1 apply.
20.11 External and internal wiring
20.11.1 Subclause 5.2.2 of section 5 of IEC 60598-1 does not apply. Internal and external
cables of lighting chains shall not be lighter than the following (see Table 1):

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60598-2-20 © IEC:2010 – 11 –
Table 1 – Characteristics of the lighting chains
For Class II ordinary lighting chains and ordinary sealed chains
60227 IEC 43

60227 IEC 52*
For Class II chains other than ordinary, using series-connected
60245 IEC 57*
lampholders

For Class II chains other than ordinary, using parallel-connected
60245 IEC 57*
lampholders and the connection cable for sealed lighting chains
other than ordinary

For Class II chains other than ordinary, where the length of cable
60245 IEC 66
between the point of supply and the nearest lampholder exceeds 3
m – for that part of the cable

For Class III chains and parts of chains supplied by SELV and with a
60227 IEC 42*
maximum rated wattage exceeding 50 W



For Class III chains and parts of chains supplied by SELV and w
...