IEC 60598-2-20:2014

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

IEC 60598-2-20:2014 specifies requirements for lighting chains fitted with series, parallel or a combination of series/parallel connected light sources for use either indoors or outdoors on supply voltages not exceeding 250 V. For combinations where rope lights (also known as sealed lighting chains) are included, see IEC 60598-2-21. This fourth edition cancels and replaces the third edition (2010). This edition includes the following significant technical changes with respect to the previous edition, where the requirements for rope lights (sealed lighting chains) have been removed and are now dealt with in IEC 60598-2-21. The contents of the corrigendum of December 2016 have been included in this copy.
This publication is to be read in conjunction with IEC 60598-1:2014

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

L'IEC 60598-2-20:2014 spécifie les exigences applicables aux guirlandes lumineuses munies de sources lumineuses 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. Pour les combinaisons contenant des cordons lumineux (également appelés guirlandes lumineuses scellées), voir l'IEC 60598-2-21. Cette quatrième édition annule et remplace la troisième édition (2010). Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente. La principale modification est le retrait des exigences concernant les cordons lumineux (guirlandes lumineuses scellées), ces exigences étant à présent traitées dans l'IEC 60598-2-21. Le contenu du corrigendum de décembre 2016 a été pris en considération dans cet exemplaire.
Cette publication doit être lue conjointement avec la CEI 60598-1:2014.

General Information

• Status: Published
• Publication Date: 24-Nov-2014
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.140.40 - Luminaires
• Technical Committee: SC 34D - Luminaires
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 31-Jan-2022

Standards Content (sample)

IEC 60598-2-20
Edition 4.0 2014-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Luminaires –
Part 2-20: Particular requirements – Lighting chains
Luminaires –
Partie 2-20: Exigences particulières – Guirlandes lumineuses
IEC 60598-2-20:2014-11(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60598-2-20
Edition 4.0 2014-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Luminaires –
Part 2-20: Particular requirements – Lighting chains
Luminaires –
Partie 2-20: Exigences particulières – Guirlandes lumineuses
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX S
ICS 29.140.40 ISBN 978-2-8322-1940-9

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60598-2-20:2014 © IEC 2014
CONTENTS

FOREWORD ........................................................................................................................... 4

20.1 Scope .......................................................................................................................... 6

20.2 Normative references ................................................................................................... 6

20.3 Terms and definitions .................................................................................................. 7

20.4 General test requirements ............................................................................................ 7

20.5 Classification of luminaires .......................................................................................... 7

20.5.1 General ............................................................................................................ 7

20.5.2 Protection against electric shock ...................................................................... 7

20.5.3 Protection against dust, solid objects and moisture ........................................... 8

20.6 Marking ....................................................................................................................... 8

20.6.1 General ............................................................................................................ 8

20.6.2 Lighting chain marking ...................................................................................... 8

20.6.3 Lighting chain and packing marking .................................................................. 8

20.6.4 Packing or instruction marking .......................................................................... 8

20.7 Construction ................................................................................................................ 9

20.7.1 General ............................................................................................................ 9

20.7.2 Lampholders .................................................................................................... 9

20.7.3 Terminal blocks .............................................................................................. 10

20.7.4 Terminals and supply connections .................................................................. 10

20.7.5 Gaskets ......................................................................................................... 10

20.7.6 Mechanical strength ....................................................................................... 10

20.7.7 Lamp bridging devices .................................................................................... 10

20.7.8 Control units ................................................................................................... 10

20.7.9 Lamp rotation ................................................................................................. 11

20.7.10 Lamp insertion/withdrawal force ...................................................................... 11

20.7.11 Lamp mechanical requirements ...................................................................... 11

20.8 Creepage distances and clearances ........................................................................... 12

20.9 Provisions for earthing ............................................................................................... 12

20.10 Terminals .................................................................................................................. 12

20.11 External and internal wiring ........................................................................................ 12

20.11.1 General .......................................................................................................... 12

20.11.2 Cables for lighting chains ............................................................................... 12

20.11.3 Cord anchorage test ....................................................................................... 13

20.11.4 Plugs and cable length ................................................................................... 13

20.11.5 Maximum length of extendable class II lighting chains ..................................... 13

20.12 Protection against electric shock ................................................................................ 13

20.12.1 General .......................................................................................................... 13

20.12.2 Divisible plug .................................................................................................. 13

20.12.3 Electrification of decorations ........................................................................... 14

20.12.4 Contacts of push-in lampholders ..................................................................... 14

20.12.5 Blanking plugs ................................................................................................ 15

20.13 Endurance tests and thermal tests ............................................................................. 15

20.13.1 General .......................................................................................................... 15

20.13.2 Test voltage ................................................................................................... 15

20.13.3 Lamp bridging devices .................................................................................... 16

---------------------- Page: 4 ----------------------
IEC 60598-2-20:2014 © IEC 2014 – 3 –

20.13.4 Short-circuit test of rectifier ............................................................................ 16

20.14 Resistance to dust, solid objects and moisture ........................................................... 16

20.15 Insulation resistance and electric strength .................................................................. 16

20.16 Resistance to heat, fire and tracking .......................................................................... 17

Annex A (normative) Requirements for interconnecting connectors for use in lighting

chains ................................................................................................................................... 18

Bibliography .......................................................................................................................... 20

Figure 1 – Example of a connector to a divisible plug for lighting chains ................................. 14

Figure 2 – Example of test device suitable for checking security of lampholder contacts ....... 15

Table 1 – Cables for lighting chains ....................................................................................... 12

---------------------- Page: 5 ----------------------
– 4 – IEC 60598-2-20:2014 © IEC 2014
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

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

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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

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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

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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

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expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

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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 fourth edition cancels and replaces the third edition (2010).

This edition includes the following significant technical changes with respect to the previous

edition, where the requirements for rope lights (sealed lighting chains) have been removed and

are now dealt with in IEC 60598-2-21.
---------------------- Page: 6 ----------------------
IEC 60598-2-20:2014 © IEC 2014 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
34D/1145/FDIS 34D/1153/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.

This standard is intended to be read in conjunction with IEC 60598-1 Luminaires – Part 1:

General requirements and tests.
In this standard, the following print types are used:
– requirements: in roman type;
– test specifications: in italic type;
– notes: in small roman type.

A list of all the parts in the IEC 60598 series, published 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.

The contents of the Corrigendum 1 of December 2016 have been included in this copy.

---------------------- Page: 7 ----------------------
– 6 – IEC 60598-2-20:2014 © IEC 2014
LUMINAIRES –
Part 2-20: Particular requirements –
Lighting chains
20.1 Scope

This part of IEC 60598 specifies requirements for lighting chains fitted with series, parallel or a

combination of series/parallel connected light sources for use either indoors or outdoors on

supply voltages not exceeding 250 V.

For combinations where rope lights (also known as sealed lighting chains) are included, see

IEC 60598-2-21.

Lighting chains provided with fixed or detachable attachments e.g. ornamental or decorative,

are considered to be covered by this standard.

For lighting chains fitted with lampholders of the push-in type, the appropriate requirements of

this standard applies.

NOTE 1 A Christmas tree lighting 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.

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.

NOTE 2 For products where the lighting chain is permanently fixed to a frame or pre-lit Christmas tree the relevant

clauses of IEC 60598-2-4 and/or IEC 60598-2-7 can also apply.
NOTE 3 In some countries the term "strings" is used instead of "chains".
NOTE 4 Candlestick luminaries are tested according to IEC 60598-2-4.
20.2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments)

applies.

IEC 60227-5:2011, Polyvinyl chloride insulated cables of rated voltages up to and including

450/750 V – Part 5: Flexible cables (cords)
IEC 60238, Edison screw lampholders

IEC 60245-4:2011, Rubber insulated cables – Rated voltages up to and including 450/750 V –

Part 4: Cords and flexible cables

IEC 60320 (all parts), Appliance couplers for household and similar general purposes

IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60598-1, Luminaires – Part 1: General requirements and tests
---------------------- Page: 8 ----------------------
IEC 60598-2-20:2014 © IEC 2014 – 7 –

IEC 60906 (all parts), IEC System of plugs and socket-outlets for household and similar

purposes
IEC 61184, Bayonet lampholders

IEC 61347-2-11, Lamp controlgear – Part 2-11: Particular requirements for miscellaneous

electronic circuits used with luminaires

IEC 61347-2-13, Lamp controlgear – Part 2-13: Particular requirements for d.c. or a.c. supplied

electronic controlgear for LED modules
IEC 61984:2008, Connectors – Safety requirements and tests

ISO 4046-4:2002, Paper, board, pulps and related terms – Vocabulary – Part 4: Paper and

board grades and converted products
20.3 Terms and definitions

For the purpose of this document, the terms and definitions given in IEC 60598-1 as well as the

following apply.
20.3.1
lighting chain

luminaire comprising an assembly of series-connected lamps, parallel-connected lamps or

series/parallel-connected lamps and interconnecting insulated conductors

Note 1 to entry: 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 to entry: For lighting chains with non-removable lamps, the lamps are regarded as part of the chain.

Note 3 to entry: A lighting chain may incorporate control devices (e.g. flasher units, see 20.7.8).

Note 4 to entry: Unless otherwise stated, references to lamps within this standard also refer to LEDs.

20.3.2
rope light
sealed lighting chain

lighting chain with non-replaceable light sources enclosed in a rigid or flexible insulating

translucent pipe or tube, sealed at the ends, with or without joints
Note 1 to entry: Covered by IEC 60598-2-21.
20.4 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.

20.5 Classification of luminaires
20.5.1 General

Lighting chains shall be classified in accordance with the provisions of Section 2 of

IEC 60598-1 together with the requirements of 20.5.2 and 20.5.3.
20.5.2 Protection against electric shock
Lighting chains shall be classified as Class II or Class III.
---------------------- Page: 9 ----------------------
– 8 – IEC 60598-2-20:2014 © IEC 2014
20.5.3 Protection against dust, solid objects and moisture
Lighting chains for outdoor use shall have a protective index IP 44 or higher.
20.6 Marking
20.6.1 General

The provisions of Section 3 of IEC 60598-1 apply together with the requirements of 20.6.2 to

20.6.4.
20.6.2 Lighting chain marking
The following information shall be marked on the lighting chain:
– rated voltage of the complete chain;
– rated wattage of the complete chain.

Where the information is on the cable, it shall be marked on a durable non-removable sleeve or

label.
20.6.3 Lighting chain and packing marking

The following marking shall be placed on the lighting chain and on the accompanying packing

of lighting chains for indoor use only.
– “FOR INDOOR USE ONLY”.

– As an alternative to the text, the lighting chain can be marked with the symbol

[SOURCE: IEC 60417-5957 (2004-12)]. The symbol shall be explained in the instructions.

NOTE In some countries (UK and Australia) national requirements are such that a plug must be fitted to a portable

appliance. In situations where this plug does not provide the same ingress protection of the lighting chain

information concerning the location of the plug/transformer may be given e.g. "Plug/transformer for indoor use

only".
20.6.4 Packing or instruction marking

The following or similar marking shall be placed on the accompanying packing or instructions.

a) For all lighting chains where the packing has not been adapted for display purposes:

– “Do not connect the chain to the supply while it is in the packing”.
b) For lighting chains with replaceable lamps:
– voltage and wattage or manufacturer's article number of replacement lamps;
– “Do not remove or insert lamps while the chain is connected to the supply”;
– “Ensure that all lampholders are fitted with a lamp”.
c) Lighting chains designed to be used without a lamp in every lampholder:
– adequate information about required blanking plug(s).
d) For chains with replaceable series-connected lamps:

– “Replace failed lamps immediately by lamps of the same type as delivered or of a type

specified by the manufacturer”.
e) For lighting chains with ‘fuse’ lamp(s):

– “Do not replace a ‘fuse’ lamp with a non-’fuse’ lamp”; in order to indicate the difference

from ‘ordinary’ lamps, ‘fuse’ lamps shall be partly coloured white;

– information indicating that the chain is provided with ‘fuse’ lamps and explanation of

their function.
---------------------- Page: 10 ----------------------
IEC 60598-2-20:2014 © IEC 2014 – 9 –
f) For lighting chains with non-replaceable lamps:
– “The lamps are not replaceable”.

g) For class II lighting chains with non-replaceable lamps, the substance of the following:

– where breakage or damage to lamps occurs the chain must not be used/energised but

disposed of safely.

h) For lighting chains which rely on gaskets to provide the specified degree of protection

against dust, solid objects and moisture:
– “WARNING – THIS LIGHTING CHAIN MUST NOT BE USED WITHOUT ALL GASKETS
BEING IN PLACE”
i) For lighting chains intended for interconnection:

– “Do not interconnect parts of this lighting chain with parts of another manufacturer's

lighting chain”;

– “Interconnection shall be made only by the use of the supplied connectors. Any open

ends must be sealed-off before use”;
– maximum system length that may be interconnected;
– maximum number of lamps or max system wattage that may be interconnected.
j) For lighting chains incorporating lamp bridging device(s):
– information stating that the chain is fitted with a bridging device(s).
k) For class III lighting chains delivered without a supply source:
– relevant information concerning the required supply source.
l) For mains voltage lighting chains with series connected lamps:
– “WARNING – RISK OF ELECTRIC SHOCK IF LAMPS ARE BROKEN OR MISSING. DO
NOT USE”
20.7 Construction
20.7.1 General

The provisions of Section 4 of IEC 60598-1 apply together with the requirements of 20.7.2 to

20.7.11
20.7.2 Lampholders

In lighting chains where non-standardised lampholders (e.g. of the push-in type) are used, the

lampholders are regarded as parts of the lighting chain and tested accordingly.

Edison screw lampholders E5, E10, E14 and E27 shall meet the requirements of IEC 60238.

Bayonet lampholders shall meet the requirements of IEC 61184.

Insulation piercing terminals on lampholders are acceptable only if used in the SELV circuit of

lighting chains or as permanent, non-rewireable connections in class II chains.

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 lampholders 60 V
– for parallel connected E10 lampholders 250 V
Compliance is checked by inspection.
---------------------- Page: 11 ----------------------
– 10 – IEC 60598-2-20:2014 © IEC 2014
Lampholders shall have a body of insulating material.
Compliance is checked by inspection.
20.7.3 Terminal blocks

Clause 4.6 of Section 4 of IEC 60598-1 referring to terminal blocks does not apply.

20.7.4 Terminals and supply connections

Clause 4.7 of Section 4 of IEC 60598-1 referring to terminals and supply connections applies

together with the following requirement.

Interconnecting connectors for lighting chains shall, in addition, comply with the requirements

and modifications given in Annex A.

Compliance is checked by inspection and by carrying out the tests of this standard.

20.7.5 Gaskets

Gaskets used to provide the specified degree of protection against dust, solid objects 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 is checked by inspection and by manual test.
NOTE A test to verify the weather resistance of gaskets is under consideration.
20.7.6 Mechanical strength

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 free fall test specified for E5 and

E10 lampholders shall also apply for push-in lampholders.
For bayonet lampholders, the tests in Clause 15 of IEC 61184 apply.
The tests are made on three samples of the lampholder witho
...