Plugs and socket-outlets for household and similar purposes - Part 2-7: Particular requirements for cord extension sets

IEC 60884-2-7:2011 applies to cord extension sets, rewirable and non rewirable, with or without earthing contact, with a rated voltage greater than 50 V but not exceeding 440 V and a rated current not exceeding 16 A, intended for household and similar purposes, either indoors or outdoors.
This publication is to be read in conjunction with IEC 60884-1:2002.

Prises de courant pour usages domestiques et analogues - Partie 2-7: Exigences particulières pour les cordons prolongateurs

La CEI 60884-2-7:2011 s'applique aux cordons prolongateurs, démontables et non démontables, avec ou sans contact de terre, de tension assignée supérieure à 50 V mais ne dépassant pas 440 V et de courant assigné ne dépassant pas 16 A, destinés aux usages domestiques et analogues soit à l'intérieur soit à l'extérieur.
Cette publication doit être lue conjointement avec la CEI 60884-1:2002.

Vtiči in vtičnice za gospodinjstva in podobne namene - 2-7. del: Posebne zahteve za podaljške za kable

General Information

Status
Published
Publication Date
22-Feb-2011
Current Stage
PPUB - Publication issued
Start Date
23-Feb-2011
Completion Date
23-Feb-2011

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IEC 60884-2-7
Edition 1.0 2011-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Plugs and socket-outlets for household and similar purposes –
Part 2-7: Particular requirements for cord extension sets
Prises de courant pour usages domestiques et analogues –
Partie 2-7: Exigences particulières pour les cordons prolongateurs
IEC 60884-2-7:2011
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
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All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by

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---------------------- Page: 2 ----------------------
IEC 60884-2-7
Edition 1.0 2011-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Plugs and socket-outlets for household and similar purposes –
Part 2-7: Particular requirements for cord extension sets
Prises de courant pour usages domestiques et analogues –
Partie 2-7: Exigences particulières pour les cordons prolongateurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX M
ICS 29.120.30 ISBN 978-2-88912-362-9
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 60884-2-7  IEC:2011
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope ............................................................................................................................ 5

2 Normative references..................................................................................................... 5

3 Definitions ..................................................................................................................... 5

4 General requirements .................................................................................................... 6

5 General remarks on tests ............................................................................................... 6

6 Ratings .......................................................................................................................... 7

7 Classification ................................................................................................................. 7

8 Marking ......................................................................................................................... 7

9 Checking of dimensions ................................................................................................. 8

10 Protection against electric shock.................................................................................... 8

11 Provision for earthing ..................................................................................................... 8

12 Terminals and terminations ............................................................................................ 8

13 Construction of fixed socket-outlets ............................................................................... 8

14 Construction of plugs and portable socket-outlets .......................................................... 9

15 Interlocked socket-outlets ............................................................................................ 10

16 Resistance to ageing, protection provided by the enclosures and resistance to

humidity ....................................................................................................................... 10

17 Insulation resistance and electric strength ................................................................... 10

18 Operation of earthing contacts ..................................................................................... 10

19 Temperature rise ......................................................................................................... 11

20 Breaking capacity ........................................................................................................ 11

21 Normal operation ......................................................................................................... 11

22 Force necessary to withdraw the plug .......................................................................... 11

23 Flexible cables and their connection ............................................................................ 11

24 Mechanical strength ..................................................................................................... 11

25 Resistance to heat ....................................................................................................... 11

26 Screws, current-carrying parts and connections ........................................................... 11

27 Creepage distances, clearances and distances through sealing compound .................. 11

28 Resistance of insulating material to abnormal heat, to fire and to tracking ................... 11

29 Resistance to rusting ................................................................................................... 11

30 Additional tests on pins provided with insulating sleeves ............................................. 11

101 EMC requirements ....................................................................................................... 12

Annex A (normative) Safety-related routine tests for factory-wired portable

accessories (protection against electric shock and correct polarity) ...................................... 13

Table 101 – Type, length of the flexible cable and nominal cross-sectional area of the

conductors of cord extension sets ........................................................................................... 9

---------------------- Page: 4 ----------------------
60884-2-7  IEC:2011 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PLUGS AND SOCKET-OUTLETS FOR HOUSEHOLD
AND SIMILAR PURPOSES –
Part 2-7: Particular requirements for cord extension sets
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

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

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

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

transparently to the maximum extent possible in their national and regional publications. Any divergence

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

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

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

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60884-2-7 has been prepared by subcommittee 23B: Plugs, socket-

outlets and switches, of IEC technical committee 23: Electrical accessories.
The text of this standard is based on the following documents:
FDIS Report on voting
23B/977/FDIS 23B/987/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 Part 2-7 shall be used in conjunction with IEC 60884-1. It was established on the basis of

the third edition of IEC 60884-1 (2002) and of its Amendment 1 (2006).
---------------------- Page: 5 ----------------------
– 4 – 60884-2-7  IEC:2011

This Part 2-7 supplements or modifies the corresponding clauses in IEC 60884-1, so as to

convert that publication into the IEC Standard: Particular requirements for cord extension

sets.

Where this Part 2-7 states "addition“, "modification“ or "replacement“, the relevant

requirement, test specifications or explanatory matter in Part 1 shall be adapted accordingly.

Subclauses, figures, tables or notes which are additional to those in Part 1 are numbered

starting from 101.

A list of all the parts in the IEC 60884 series, under the general title Plugs and socket-outlets

for household and similar purposes, 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.
---------------------- Page: 6 ----------------------
60884-2-7  IEC:2011 – 5 –
PLUGS AND SOCKET-OUTLETS FOR HOUSEHOLD
AND SIMILAR PURPOSES –
Part 2-7: Particular requirements for cord extension sets
1 Scope
Replacement:

This Part of IEC 60884 applies to cord extension sets, rewirable and non rewirable, with or

without earthing contact, with a rated voltage greater than 50 V but not exceeding 440 V and

a rated current not exceeding 16 A, intended for household and similar purposes, either

indoors or outdoors.

NOTE 1 In the following countries, cord extension sets only for equipment of class II are not allowed: DE, UK and

CZ.

NOTE 2 In the following country, rewirable cord extension sets are not allowed: ZA.

This standard does not apply to cord extension sets with means for reeling.

This standard also applies to cord extension sets which are intended to be used in a cable

reel, and which therefore become cable reels with a detachable flexible cable. For the

combination of the cord extension set, the reel requirements and tests of IEC 61242 have to

be fulfilled in addition.

Cord extension sets should be suitable for use at ambient temperatures not normally

exceeding +40 ºC, but their average over a period of 24 h does not exceed +35 °C, with a

lower limit of the ambient air temperature of –5 °C.
2 Normative references
This clause of Part 1 is applicable with the following exceptions:
Addition:
− Part 1:
IEC 60884-1:2002, Plugs and socket-outlets for household and similar purposes
General requirements
Amendment 1 (2006)

IEC 60884-2-1, Plugs and socket-outlets for household and similar purposes − Part 2-1:

Particular requirements for fused plugs

IEC 61242, Electrical accessories − Cable reels for household and similar purposes

3 Definitions
This clause of Part 1 is applicable except as follows.
Replacement of NOTE 3:

NOTE 3 The term "portable accessory" covers plugs, portable socket-outlets and cord extension sets. Examples

of the use of accessories are shown in Figure 1a) of IEC 60884-1.
---------------------- Page: 7 ----------------------
– 6 – 60884-2-7  IEC:2011
3.12
cord extension set
Addition:

NOTE 101 The term “plug” covers plugs and fused plugs. The term “socket outlet” covers also socket outlets with

incorporated components such as switches and fuses etc. which are required to comply with the relevant IEC

standard as far as it applies.
3.12.101
rewirable cord extension set

cord extension set so constructed that any of the accessories or the flexible cable can be

replaced with the aid of a general purpose tool
3.12.102
non-rewirable cord extension set

cord extension set so constructed that it forms a complete unit with the flexible cable, the plug

and the socket-outlet after connection and assembly by the manufacturer, the disassembly of

which makes it permanently unfit for any further use
4 General requirements
This clause of Part 1 is applicable except as follows:
Addition of the following paragraph at the end of the clause:

Components (plug, socket-outlets and flexible cable) of the cord extension sets shall be fully

compliant with, and have been verified against, the relevant product standards for those

components.
5 General remarks on tests
Replacement:

5.1 Tests shall be made to prove compliance with the requirements laid down in this

standard.

No extra requirements for components (plugs, socket outlets and flexible cables) have to be

applied and the relevant tests shall not be repeated.
Tests are made as follows:
− type tests shall be made on representative specimens of each assembly;

− routine tests shall be made on each assembly manufactured according to this standard.

Subclauses 5.2 to 5.5 are applicable to type tests and Subclause 5.6 to routine tests.

5.2 The specimens are tested as delivered and under normal conditions of use.

5.3 Unless otherwise specified, the tests are carried out in the order of the clauses, at an

ambient temperature between 15 °C and 35 °C.
In case of doubt, the tests are made at an ambient temperature of (20 ± 5) °C.
5.4 Three specimens are subjected to all the relevant tests.
---------------------- Page: 8 ----------------------
60884-2-7  IEC:2011 – 7 –

5.5 The specimens are submitted to all the relevant tests and the requirements are satisfied

if all the tests are met.

If one specimen does not satisfy a test due to a manufacturing cord extension sets process

fault, that test and any preceding one which may have influenced the results of the test shall

be repeated, and also the tests which follow shall be made in the required sequence on

another full set of specimens, all of which shall comply with the requirements.

NOTE The applicant may submit, together with a number of specimens specified in Subclause 5.4, the additional

set of specimens which may be required, should one specimen fail. The testing station will then, without further

request, test the additional specimens and will only reject them if a further failure occurs. If the additional set of

specimens is not submitted at the same time, the failure of one specimen will entail rejection.

5.6 Routine tests are specified in Annex A.
6 Ratings
This clause of Part 1 is applicable except as follows.
Replacement:
6.2 The rated current of the cord extension set shall be the lowest value from
a) the rated current of the plug; or

b) the arithmetic sum of the highest rated currents of all plugs which can be inserted into

the cord extension set; or
c) the rated current of the protective overcurrent device.
The rated voltage of the cord extension set is that of the plug.
Compliance is checked by inspection of the marking.
7 Classification

This clause of Part 1 is not applicable except for 7.1.1, 7.1.2, 7.1.3 and 7.1.4.

8 Marking
This clause of Part 1 is applicable except as follows.
8.1 Addition after the fourth dashed text:

NOTE 101 This marking for cord extension set is necessary only if the manufacturer of the cord extension set is

different to the manufacturer of the socket-outlet. The marking of the name, trade mark or identification mark of the

manufacturer or responsible vendor may for example be applied on a sleeve or label provided around the cord.

Addition after the fifth dashed text:

NOTE 102 For a cord extension set, the type reference, which may be a catalogue number, may be placed on the

smallest packaging unit.
Addition at the end:

– in case of multiple portable socket-outlets or when there is an overcurrent protective

device, the power in watts.
Addition at the end:
---------------------- Page: 9 ----------------------
– 8 – 60884-2-7  IEC:2011
The marking for power shall be completed by the word MAX.

The power is calculated using the nominal supply voltage in volts and a power factor

cos ϕ = 1.
NOTE 103 These markings may be shown as in the following examples:
MAX 2000 W or 2000 W MAX
The maximum admissible power marking shall not be hidden by any inserted plug.
9 Checking of dimensions
This clause of Part 1 is not applicable.
10 Protection against electric shock
Replacement of the text of Clause 10:

10.1 Cord extension sets shall be so designed and constructed that after they are wired and

assembled as for normal use, live parts are not accessible, even after removal of parts which

can be removed without the use of a tool.
Compliance is checked by inspection and, if necessary, by the following test.

The standard test finger, test probe B of IEC 61032, is applied in every possible position, an

electrical indicator with a voltage between 40 V and 50 V being used to show contact with the

relevant parts.

10.2 Cord extension sets shall be so designed and constructed that after they are wired and

assembled as for normal use, live parts are not accessible, even after removal of parts which

can be removed without the use of a tool.

Compliance is checked by inspection and by applying with a test wire of 1,0 mm diameter

(see Figure 10 of Part 1) a force of 1 N where the cable enters the plug and the portable

socket outlet in every possible position.
During this test, it shall not be possible to touch live parts with the gauge.
An electrical indicator with a voltage between 40 V and 50 V shall be used.
11 Provision for earthing
This clause of Part 1 is not applicable.
12 Terminals and terminations
This clause of Part 1 is not applicable.
13 Construction of fixed socket-outlets
This clause of Part 1 is not applicable.
---------------------- Page: 10 ----------------------
60884-2-7  IEC:2011 – 9 –
14 Construction of plugs and portable socket-outlets
Replacement of the title and text of Clause 14:
14 Construction of cord extension sets
14.1 Socket-outlets to be used in cord extension sets shall have shutters.

NOTE 1 In the following countries socket-outlets to be used in cord extension sets are not required to have

shutters: AU, AT, CA, CH, SG, JP, US.

NOTE 2 In the following country the standards sheets for the portable socket-outlets specify the requirements for

shutters: DK.
Plugs and socket outlets shall comply with IEC 60884-1.
Fused plugs shall comply with IEC 60884-2-1.
Flexible cables shall comply with IEC 60227 or IEC 60245.

The flexible cable shall have the same number of conductors as the poles in the socket-

outlet(s). Earthing contacts, if any, are considered as one pole.

Where an earthing contact is provided in the socket-outlet it shall be connected to the

corresponding earthing contact of the plug.
Compliance is checked by inspection.

14.2 The type, length of the flexible cable and nominal cross-sectional area of the

conductors of cord extension sets shall comply with Table 101.
Table 101 – Type, length of the flexible cable and nominal cross-sectional area
of the conductors of cord extension sets
Minimum nominal
Maximum length of
Rated current Lightest type of cross-sectional area
the flexible cable
of the conductors
A flexible cable
2,5 60227 IEC 52 0,50 3
60227 IEC 52 0,75
6 5
60227 IEC 53 1,00
60227 IEC 53 or 0,75 5
60245 IEC 53
1,00 30
1,00 5
60227 IEC 53 or
60245 IEC 53 1,50 30
60227 IEC 53 or 1,00 2
60245 IEC 53 1,50 30
a 2

In the following countries the minimum nominal cross-sectional area is 1,25 mm : UK and SG.

In the following countries, for cord extension sets with socket outlet of class I, the minimum

nominal cross-sectional area is 1,5 mm : DE, FI.

NOTE 1 In the following countries, cord extension sets having a rated current of 6 A and 13 A are not allowed:

CH, DE, FI, IT and NO.

NOTE 2 In the following countries, cord extension sets intended for outdoor use should be provided with cable

type 60245 IEC 53 or equivalent: FI, NO, SA and SE.
---------------------- Page: 11 ----------------------
– 10 – 60884-2-7  IEC:2011

NOTE 3 In the following country the nominal cross-sectional area is 1,5 mm for 5 m maximum length and

2,5 mm for 30 m maximum length: SA.

The length of the cable is measured between the operating faces of the plug and the socket-

outlet. In the case of multiple socket-outlets the measurement is taken to the socket-outlet

closest to the plug.
Compliance is checked by inspection and measurement.

14.3 The rated current of the plug shall not be lower than the rated current of the socket-

outlet.

In a cord extension set protected against overload (e.g. having a fused plug or a protective

overcurrent device), the rated current of the plug shall not be lower than the rated current of

the protective overcurrent device.

For a cord extension set with a multiple portable socket-outlet and not incorporating a

protective overcurrent device, the rated current of the plug shall be at least the arithmetic sum

of the highest rated currents of all plugs which can be inserted into the cord extension set or

the same as the rated current of the relevant socket outlet of the fixed wiring the plug is

intended to be connected to, whichever is the lower.

NOTE In the following country this requirement is not applicable because it is possible to insert a 10 A, 13 A or 16

A plug into a 10 A, 13 A, or 16 A socket-outlet: DK
Compliance is checked by inspection.

14.4 The rated voltage of the plug and the socket-outlet shall be the same. The rated

voltage of the cable shall not be less than the rated voltage of the plug and socket-outlet.

Compliance is checked by inspection.
15 Interlocked socket-outlets
This clause of Part 1 is not applicable.
16 Resistance to ageing, protection provided by the enclosures and resistance
to humidity
Replacement:

The protection degree of the cord extension set is the same as the lowest protection degree

of the plug and the portable socket outlet.
Compliance is checked by inspection.
17 Insulation resistance and electric strength
This clause of Part 1 is not applicable.
18 Operation of earthing contacts
This clause of Part 1 is not applicable.
---------------------- Page: 12 ----------------------
60884-2-7  IEC:2011 – 11 –
19 Temperature rise
This clause of Part 1 is not applicable.
20 Breaking capacity
This clause of Part 1 is not applicable.
21 Normal operation
This clause of Part 1 is not applicable.
22 Force necessary to withdraw the plug
This clause of Part 1 is not applicable.
23 Flexible cables and their connection
This clause of Part 1 is not applicable.
24 Mechanical strength
This clause of Part 1 is not applicable.
25 Resistance to heat
This clause of Part 1 is not applicable.
26 Screws, current-carrying parts and connections
This clause of Part 1 is not applicable.
27 Creepage distances, clearances and distances through sealing compound
This clause of Part 1 is not applicable.
28 Resistance of insulating material to abnormal heat, to fire and to tracking
This clause of Part 1 is not applicable.
29 Resistance to rusting
This clause of Part 1 is not applicable.
30 Additional tests on pins provided with insulating sleeves
This clause of Part 1 is not applicable.
---------------------- Page: 13 ----------------------
– 12 – 60884-2-7  IEC:2011
Addition:
101 EMC requirements
101.1 Immunity

The operation of cord extension sets within the scope of this standard, in normal use, is not

affected by electromagnetic disturbances.
101.2 Emission

Cord extension sets within the scope of this standard are intended for continuous use; in

normal use they do not generate electromagnetic disturbances.
...

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