SIST EN 61242:1997
(Main)Electrical accessories - Cable reels for household and similar purposes
Electrical accessories - Cable reels for household and similar purposes
This International Standard applies to cable reels for a.c. only, provided with a
non-detachable flexible cable with a rated voltage above 50 V and not exceeding 250 V for
single-phase cable reels and above 50 V and not exceeding 440 V for all other cable
reels, and a rated current not exceeding 16 A. They are intended for household,
commercial and light industrial and similar purposes, either indoors or outdoors, with
particular reference to safety in normal use.
Cable reeling devices incorporated in appliances are under consideration.
Cable reels complying with this standard are suitable for use at ambient temperatures not
normally exceeding 25 °C, but occasionally reaching 35 °C. In locations where special
conditions prevail, special construction may be required.
NOTE - This standard does not apply to cable reels with a detachable flexible cable.
Elektrisches Installationsmaterial - Leitungsroller für den Hausgebrauch und ähnliche Zwecke
Petit appareillage électrique - Cordons prolongateurs enroulés sur tambour pour usages domestiques
S'applique aux cordons prolongateurs enroulés sur tambour (enrouleurs dans la suite du texte) pour courant alternatif seulement, munis d'un câble souple non détachable, de tension assignée supérieure à 50 V et ne dépassant pas 250 V pour les enrouleurs monophasés, et supérieure à 50 V et ne dépassant pas 440 V pour tous les autres enrouleurs de courant assigné ne dépassant pas 16 A.
Electrical accesories - Cable reels for household and similar purposes (IEC 1242:1995, modified)
Ta mednarodni standard velja za kabelske kolute samo za izmenični tok, opremljene z neločljivim gibljivim kablom z nazivno napetostjo nad 50 V in ne večjo od 250 V za enofazne kabelske kolute in nad 50 V in ne več kot 440 V za vse druge kabelske kolute ter naznačenim tokom, ki ne presega 16 A. Namenjene so za gospodinjske, komercialne in lahke industrijske ter podobne namene bodisi v zaprtih prostorih bodisi na prostem s posebnim poudarkom na varnosti pri običajni uporabi.
V obravnavi so naprave za navijanje kablov, ki so vgrajene v aparate. Kabelski koluti, ki so skladni s tem standardom, so primerni za uporabo pri temperaturah okolice, ki običajno ne presegajo 25 °C, vendar občasno dosežejo 35 °C. Na območjih, kjer prevladujejo posebne razmere, je lahko zahtevana posebna konstrukcija.
OPOMBA - Ta standard ne velja za kabelske kolute s snemljivim gibljivim kablom.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 61242:1997
01-november-1997
Electrical accesories - Cable reels for household and similar purposes (IEC
1242:1995, modified)
Electrical accessories - Cable reels for household and similar purposes
Elektrisches Installationsmaterial - Leitungsroller für den Hausgebrauch und ähnliche
Zwecke
Petit appareillage électrique - Cordons prolongateurs enroulés sur tambour pour usages
domestiques
Ta slovenski standard je istoveten z: EN 61242:1997
ICS:
29.120.99 'UXJDHOHNWULþQDGRGDWQD Other electrical accessories
RSUHPD
55.060 Tulci. Vretena Spools. Bobbins
SIST EN 61242:1997 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN 61242:1997
---------------------- Page: 2 ----------------------
SIST EN 61242:1997
---------------------- Page: 3 ----------------------
SIST EN 61242:1997
---------------------- Page: 4 ----------------------
SIST EN 61242:1997
---------------------- Page: 5 ----------------------
SIST EN 61242:1997
---------------------- Page: 6 ----------------------
SIST EN 61242:1997
---------------------- Page: 7 ----------------------
SIST EN 61242:1997
---------------------- Page: 8 ----------------------
SIST EN 61242:1997
---------------------- Page: 9 ----------------------
SIST EN 61242:1997
---------------------- Page: 10 ----------------------
SIST EN 61242:1997
---------------------- Page: 11 ----------------------
SIST EN 61242:1997
---------------------- Page: 12 ----------------------
SIST EN 61242:1997
CEI
NORME
IEC
INTERNATIONALE
1242
INTERNATIONAL
Première édition
STANDARD First edition
1995-02
Petit appareillage électrique -
Cordons prolongateurs enroulés sur
tambour pour usages domestiques
Electrical accessories -
Cable reels for household and
similar purposes
Droits de reproduction réservés — Copyright — all rights reserved
© CEI 1995
of this publication may be reproduced or utilized in
Aucune partie de cette publication ne peut être reproduite ni No part
utilisée sous quelque forme que ce soit et par aucun pro- any form or by any means, electronic or mechanical,
cédé, électronique ou mécanique, y compris la photocopie et including photocopying and microfilm, without permission
les microfilms, sans l'accord écrit de l'éditeur. in writing from the publisher.
Suisse
Internationale 3, rue de Varembé Genève,
Bureau Central de la Commission Electrotechnique
Commission Electrotechnique Internationale CODE PRIX v
International Electrotechnical Commission
PRICE CODEPRICE CODE
MettutyttapoAtiaa 3neisrpoTexHNVecttaa IioMHCcua
IEC
catalogue en vigueur
Pour prix, voir
• •
For price, see current catalogue
---------------------- Page: 13 ----------------------
SIST EN 61242:1997
1242©IEC:1995 - 3 -
CONTENTS
Page
FOREWORD 5
Clause
1 Scope 7
2 Normative references 7
3 Definitions 9
13
4 General requirements .
13
5 General conditions for type testing
13
6 Classification
15
7 Marking
19 8 Protection against electric shock
21
9 Provision for earthing
25
10 Terminals and terminations
35
11 Flexible cables and their connection
12 Construction 39
43
13 Components
45
14 Resistance to ageing
45
15 Resistance to harmful ingress of water
47
16 Resistance to humidity
49
17 Insulation resistance and electric strength
51
18 Normal operation
53
19 Temperature rise in normal use
59 20 Temperature rise under overload condition
63
21 Mechanical strength
67
22 Resistance to heat
69
23 Screws, current-carrying pa rts and connections
24 Creepage distances, clearances and distances
75
through sealing compound
25 Resistance of insulating material to abnormal heat,
to fire and to tracking 79
81
26 Resistance to rusting
84
Figures
Annexes
91
A - Guidance for routine tests of cable reels
B - Bibliography 93
---------------------- Page: 14 ----------------------
SIST EN 61242:1997
1242 ©IEC:1995 - 5 -
INTERNATIONAL ELECTROTECHNICAL COMMISSION
ELECTRICAL ACCESSORIES -
CABLE REELS FOR HOUSEHOLD AND
SIMILAR PURPOSES
FOREWORD
The IEC (International Electrotechnical Commission) is a worldwide organization for standardization
1)
comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to
promote international cooperation on all questions concerning standardization in the electrical and
electronic fields. To this end and in addition to other activities, the IEC publishes International Standards.
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. The IEC
collaborates closely with the International Organization for Standardization (ISO) in accordance with
conditions determined by agreement between the two organizations.
The formal decisions or agreements of the IEC on technical matters, prepared by technical committees on
2)
which all the National Committees having a special interest therein are represented, express, as nearly as
possible, an international consensus of opinion on the subjects dealt with.
They have the form of recommendations for international use published in the form of standards, technical
3)
reports or guides and they are accepted by the National Committees in that sense.
4} In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
International Standard IEC 1242 has been prepared by sub-committee 23B: Plugs,
socket-outlets and switches, of IEC technical committee 23: Electrical accessories.
The text of this standard is based on the following documents:
on Voting
DIS Report
23B/432/RVD
23B(CO)192
rt
Full information on the voting for the approval of this standard can be found in the repo
on voting indicated in the above table.
In this standard, the following print types are used:
- Requirements proper: in roman type.
- Test specifications: in italic type.
Explanatory matter: in smaller roman type.
---------------------- Page: 15 ----------------------
SIST EN 61242:1997
7 -
1242 ©IEC:1995 -
ELECTRICAL ACCESSORIES -
CABLE REELS FOR HOUSEHOLD AND
SIMILAR PURPOSES
1 Scope
This International Standard applies to cable reels for a.c. only, provided with a
non-detachable flexible cable with a rated voltage above 50 V and not exceeding 250 V for
single-phase cable reels and above 50 V and not exceeding 440 V for all other cable
reels, and a rated current not exceeding 16 A. They are intended for household,
commercial and light industrial and similar purposes, either indoors or outdoors, with
particular reference to safety in normal use.
Cable reeling devices incorporated in appliances are under consideration.
Cable reels complying with this standard are suitable for use at ambient temperatures not
normally exceeding 25 °C, but occasionally reaching 35 °C. In locations where special
conditions prevail, special construction may be required.
NOTE - This standard does not apply to cable reels with a detachable flexible cable.
2 Normative references
The following normative documents contain provisions which, through reference in this
text, constitute provisions of this International Standard. At the time of publication, the
editions indicated were valid. All normative documents are subject to revision, and parties
to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated
below. Members of IEC and ISO maintain registers of currently valid International
Standards.
International Electrotechnical Vocabulary (IEV) - Chapter 441:
IEC 50(441): 1984,
Switchgear, controlgear and fuses
Method for determining the comparative and the proof tracking indices of
IEC 112: 1979,
solid insulating materials under moist conditions
Polyvinyl chloride insulated cables of rated voltage up to and including
IEC 227,
450/750 V
Rubber insulated cables of rated voltages up to and including 450/750 V
IEC 245,
IEC 364, Electrical installations of buildings
Graphical symbols for use on equipment. Index, survey and compilation of
IEC 417: 1973,
the single sheets
Degrees of protection provided by enclosures (IP Code)
IEC 529: 1989,
---------------------- Page: 16 ----------------------
SIST EN 61242:1997
1242 ©IEC:1995 - 9 -
IEC 695-2-1: 1991, Fire hazard testing - Part 2: Test methods - Section 1: Glow-wire test
and guidance
IEC 884-1: 1994, Plugs and socket-outlets for household and similar purposes - Part 1:
General requirements
Connecting devices - Safety requirements for screw-type and screwless-type
IEC 999: 1990,
clamping units for electrical copper conductors
Metallic coatings - Electrodeposited coatings of nickel plus chromium
ISO 1456: 1988,
and of copper plus nickel plus chromium
Metallic coatings - Electroplated coatings of zinc on iron or steel
ISO 2081: 1986,
ISO 2093: 1986, Electroplated coatings of tin - Specification and test methods
3 Definitions
For the purpose of this International Standard, the following definitions apply.
Where the terms voltage and current are used, the imply r.m.s. values, unless otherwise
specified.
Voltage assigned to the cable reel by the manufacturer.
3.1 rated voltage:
3.2 rated current: Current assigned to the cable reel by the manufacturer.
3.3 cable reel: Device comprising a flexible cable attached to a reel, so constructed that
the flexible cable may be wound onto the reel.
NOTE - Plugs and socket-outlets supplied with cable reels are considered as part of the reel.
Cable reel which can be easily moved from one place to another.
3.3.1 po rtable cable reel:
3.3.2 fixed cable reel: Cable reel intended for mounting on a fixed support.
3.4 non-detachable flexible cable: Flexible cable which is fixed to a cable reel.
3.5 rewirable cable reel: Cable reel so constructed that the flexible cable can be
replaced with the aid of a general purpose tool.
Cable reel so constructed that it forms a complete unit
3.6 non-rewirable cable reel:
with the flexible cable, and the plug and the socket-outlets are fixed by the manufacturer
of the cable reel in such a manner that, after dismantling, the cable reel is rendered unfit
for any further use (see also 12.5).
Part which can be touched by means of the standard test finger.
3.7 accessible part:
3.8 detachable pa rt : Part which can be removed without the aid of a general purpose tool.
---------------------- Page: 17 ----------------------
SIST EN 61242:1997
1242 ©IEC:1995 - 11 -
Shortest path along the surface of an insulating material
3.9 creepage distance:
between two conductive parts.
3.10 clearance: Distance between two conductive parts along a string stetched the
shortest way between these conductive parts. [IEV 441-17-31]
Temperature sensing control device intended to switch-off
3.11 thermal cut-out:
automatically under abnormal operating conditions and which has no provision for
adjustment by the user.
Current sensing device intended to switch off automatically under
3.12 current cut-out:
abnormal operating conditions and which has no provision for adjustment by the user.
Mechanism designed so that disconnection can neither be
3.13 trip-free mechanism:
prevented nor inhibited by a reset mechanism, and so that the contacts can neither be
prevented from opening nor be maintained closed against a continuation of the excess
temperature or current.
Thermal or current cut-out which
3.14 non-self-resetting thermal or current cut-out:
can only be reset by a manual action directly acting on the device which is used
exclusively for this purpose and which is mounted in the cable reel.
Insulation of hazardous live parts providing basic protection
3.15 basic insulation:
against electric shock. [future IEV 195-06-04]*
Independent insulation applied in addition to the basic
3.16 supplementary insulation:
insulation in order to provide protection against electric shock in event of a failure of the
basic insulation.
Insulation comprising basic insulation and supplementary
3.17 double insulation:
insulation in order to provide protection against electric shock if basic insulation fails.
[future IEV 195-06-05)*
Single insulation system which provides protection against
3.18 reinforced insulation:
electric shock equivalent to double insulation. [future IEV 195-06-06]*
clamping unit: Part(s) of the terminal necessary for the mechanical clamping and
3.19
the electrical connection of the conductor(s), including the parts which are necessary to
ensure the correct contact pressure.
3.20 terminal: Conductive part of one pole, composed of one or more clamping unit(s)
and insulation if necessary.
3.21 connecting device: Device for the electrical connection of one (or more)
conductor(s), comprising one (or more) terminal(s), either fixed to a base or forming an
integral part of the equipment.
* IEC 50(195) is at present a Committee Draft (Sec 1427).
---------------------- Page: 18 ----------------------
SIST EN 61242:1997
- 13 -
1242 © IEC:1995
3.22 termination: Insulated or non-insulated connecting device serving for non-reusable
connection of the supply conductors.
4 General requirements
Cable reels shall be so designed and constructed that in normal use their performance is
reliable and without danger to the user and surroundings.
In general, compliance is checked by carrying out all the relevant tests specified.
5 General conditions for type testing
Tests according to this standard are type tests.
5.1
5.2 Unless otherwise specified the tests are made on three samples as delivered.
The components of the cable reels are tested, unless otherwise specified, in accordance
with the requirements of the relevant standard, as applicable.
Unless otherwise specified, the tests are carried out in the order of the clauses, at
5.3
and 35 °C. In case of doubt, the tests are made
an ambient temperature between 15 °C
°C.
at an ambient temperature of 20 °C ± 5
Unless otherwise stated, three samples are submitted to all the tests and the
5.4
requirements are satisfied if all the tests are met.
If only one of the samples does not satisfy a test due to an assembly or manufacturing
fault, which is not representative of the design, 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 samples, all of which shall
comply with the requirements.
6 Classification
Cable reels are classified according to:
6.1 the method of use:
- portable;
- fixed;
6.2 the method of winding the flexible cable:
- hand-operated;
- automatic, i.e. spring-operated or motor-operated;
6.3 the method of connecting the flexible cable:
- rewirable;
-
non-rewirable;
---------------------- Page: 19 ----------------------
SIST EN 61242:1997
1242 © IEC:1995 - 15 -
6.4 the degree of protection against electric shock:
- having normal protection (e.g. complying with 8.1.1);
- having increased protection (e.g. complying with 8.1.2);
6.5 the degree of protection against harmful ingress of water:
- not protected against harmful ingress of water;
- protected against splashing water, i.e. with degree of protection IPX4;
- protected against water jets i.e. with degree of protection IPX5;
6.6 the protection against excessive temperatures:
- incorporating thermal cut-outs and/or current cut-outs;
- not incorporating thermal cut-outs or current cut-outs.
7 Marking
7.1 Cable reels shall be marked with:
rated voltage in volts;
- symbol for the nature of supply;
either the name, trade mark or identification mark of the manufacturer or of the
-
vendor responsible;
- type reference, which may be a catalogue number;
symbol for degree of protection against ingress of water if higher than IP20;
-
NOTE - The degrees of protection are based on IEC 529.
- maximum load which may be connected to the socket-outlets, to be stated in watts
supplemented with the voltage in volts, for fully-reeled and fully-extended conditions.
EXAMPLE: '1 500 W – 230 V flexible cable fully-reeled,
3 000 W – 230 V flexible cable fully-extended".
Cable reels not protected against excessive temperature shall, in addition to the marking
of the maximum allowable loads, be marked with:
"Warning - Exceeding the maximum allowable loads may involve fire risk".
Cable reels fitted with a thermal and/or current cut-outs shall be marked with an
instruction clearly stating how to reset the device.
NOTE – Cable reels may additionally be marked with rated current in amperes.
---------------------- Page: 20 ----------------------
SIST EN 61242:1997
1242 © IEC:1995 - 17 -
7.2 When symbols are used, they shall be as follows:
- amperes A
V
volts
- watts W
- alternating current ^^
- neutral N
- earth
O
- fully-reeled cable reel
- fully-extended cable reel
IPX4
- protected against splashing water
IPX5
- protected against water jets
NOTES
1 Lines formed by the construction of the tool are not considered as part of the marking.
2 For detail of the symbols for a.c. and earth, see IEC 417.
3 The letter X shall be replaced by the relevant number which is minimum 2 for this standard.
7.3 Rewirable cable reels shall be marked with:
terminals intended exclusively for the neutral conductor shall be indicated by the
-
letter N;
earthing terminals shall be indicated by the earth symbol;
marking indicating the cross-sectional area, the type and the length of the flexible
cable shall be placed where it is clearly visible;
These markings shall be so placed that they are easily legible whilst replacing the flexible
rts which
cable and they shall not be placed on screws, removable washers or on other pa
might easily be removed when connecting conductors.
7.4 The information required in 7.1 shall be clearly visible when the cable reel is in
normal use and shall be given by symbols if symbols are defined in 7.2 or otherwise in the
official language of the country of intended use.
In addition, the symbol for degree of protection against ingress of water and the maximum
load shall be placed so that they are clearly discernible, which may be achieved by use of
enlarged letters, contrasting colours, underlining, placing on separate lines, etc.
7.5 If marking plates or labels are used they shall be reliably secured. After all the tests
of this standard, markings shall be readily discernible, labels shall show no curling or
loosening at the corners or edges.
Compliance with the requirements of 7.1 to 7.5 is checked by inspection and by the test
of 7.6.
---------------------- Page: 21 ----------------------
SIST EN 61242:1997
1242 ©IEC:1995 - 19 -
7.6 Marking shall be durable and easily legible with normal or corrected vision, without
additional magnification.
Compliance is checked by inspection and by the following tests:
The test is made by rubbing the marking by hand for 15 s with a piece of cotton cloth soaked
with water and again for 15 s with a piece of cotton cloth soaked with petroleum spirit.
NOTES
1 Marking made by impression, moulding, pressing or engraving is not subjected to this test.
2 It is recommended that the petroleum spirit used is of a type consisting of a solvent hexane with an
aromatic content of maximum 0,1 volume percentage, a kauributanol value of 29, an initial boiling point of
approximately 65 °C, a dry point of approximately 69 °C and a density of approximately 0,68 g/cm .
8 Protection against electric shock
8.1 Cable reels shall be so designed that live parts are not accessible when the cable
reels is in normal use and when parts which can be removed without the aid of a tool,
have been removed.
Compliance is checked by inspection and if necessary, by the test of 8.1.1. For cable reels
with increased protection against electric shock the test of 8.1.2 is also applied.
These tests shall be made immediately after the cable reel has passed a current having
the value corresponding to the maximum load, when fully-reeled, for 1 h at an ambient
temperature of 20 °C ± 5 °C.
8.1.1 The standard test finger shown in figure 1 is applied with a force of 10 N ± 1 N in
every possible position; an electrical indicator with a voltage not less than 40 V and not
more than 50 V is used to show contact with the relevant part.
For cable reels, where the use of elastomeric or thermoplastic material is likely to
influence the compliance with the requirement, the test is repeated but at an ambient
temperature of 35 °C ± 2 °C, the cable reels being at this temperature.
s of elastomeric or thermoplastic material of the cable
During this additional test, the part
reel are subjected for 1 min to a force of 75 N, applied through the tip of a straight
unjointed test finger of the same dimensions as the standard test finger. This finger, with
an electrical indicator as described above, is applied to all places where yielding of the
insulating material could impair the safety of the cable reel.
During this test, the cable reel shall not deform to such an extent that those dimensions
shall be accessible.
which ensure safety are unduly altered and no live pa rt
The test is made with a straight rigid steel wire as specified in figure 2 applied with
8.1.2
a force of 1 N + 0,1/0 N. The end of the wire shall be free from burrs and be at right
angles to its length.
The protection is satisfactory if the wire cannot enter the enclosure, or if it enters, it does
not touch live parts inside the enclosure.
---------------------- Page: 22 ----------------------
SIST EN 61242:1997
1242 ©IEC:1995 - 21 -
The test wire is provided with an electrical indicator, with a voltage not less than 40 V and
not more than 50 V, to show contact with relevant part.
8.2 Parts providing protection against electric shock shall have adequate mechanical
strength and shall be reliably secured by means of screws or in a similar reliable manner
so that they will not work loose in normal use.
Compliance is checked by inspection and by the tests of clauses 21 and 23.
9 Provision for earthing
rts insulated from live pa rts by
9.1 For rewirable cable reels having accessible metal pa
basic insulation only:
the earthing terminal shall comply with the requirements of clause 10;
-
- the earthing terminal shall be located in proximity to the terminals for current
carrying conductors;
rts shall
- internal connections between the earthing terminal and accessible metal pa
be indepent of the connection of the flexible cable in order to prevent loosening of
internal connections during the replacement of flexible cable;
- socket-outlets shall be of a type which prevents the inse rtion of plugs used with
class 0 equipment.
NOTE - The plugs for equipment of class 0 can be used only as far as national wiring rules permit.
9.2 All pa s of the earthing terminal shall be such that there is no risk of corrosion
rt
rts and the copper of the earthing conductor, or
resulting from contact between these pa
any other metal that is in contact with these parts. The body of the earthing terminal shall
be of brass or other metal no less resistant to corrosion, unless it is a pa rt of the metal
frame or enclosure, when the screw or nut shall be of brass, plated steel complying with
clause 26, or other metal not less resistant to corrosion.
9.3 If the body of the earthing terminal is a part of a frame or enclosure of aluminium or
aluminium alloy, precautions shall be taken to avoid the risk of corrosion resulting from
contact between copper and aluminium or its alloys.
Screws and nuts of plated steel withstanding the test of clause 26 are considered to be of
a metal no less resistant to corrosion than brass.
s which may become live in the event of an insulation fault shall
9.4 Accessible metal part
be permanently and reliably connected to the earthing terminal.
For the purpose of this requirement, small screws and the like for fixing bases or covers
s which may become live in the event of an insulation fault.
are not deemed to be pa rt
9.5 The earth connection shall be effectively ensured under all conditions which may
occur in normal use, including loosening of fixing screws for covers, careless mounting of
the cover or the like.
---------------------- Page: 23 ----------------------
SIST EN 61242:1997
1242 ©IEC:1995 - 23 -
Compliance with the requirements of 9.1 to 9.5 is checked by inspection.
9.6 Earthing terminals intended for the connection of flexible external conductors shall
be designed with ample space for slack of the earthing conductor in such a way that, if the
strain relief should fail, the connection of the earthing conductor is subjected to strain after
the connections of the current-carrying conductors and that, in case of excessive stress,
the earthing conductor will break after the current-carrying conductors.
Compliance is checked by the following test:
The flexible cable is connected to the cable reels in such a way that the current-carrying
conductors are led from the strain relief to the corresponding terminals along the shortest
possible path.
After they are correctly connected, the core of the earthing conductor is led to its terminal
and cut off at a distance 8 mm longer than necessary for its correct connection.
The earthing conductor is then connected to its terminal. It shall then be possible to house
the loop, which is formed by the earthing conductor owing to its surplus length, when the
cover of the cable reel is remounted and fixed correctly.
9.7 Internal earthing circuit in cable reels, including any joints contacts and the like, shall
be of low electrical resistance.
Compliance is checked by the following measurement which is made after the test
specified in clause 21.
A current derived from an a.c. source, having a no load voltage not exceeding 12 V, and
equal 1.5 times rated current of the cable or 25 A, whichever is the greater, is passed
through the earthing circuit.
The voltage drop is measured and the resistance calculated from the current and this
voltage drop.
The resistance shall not exceed 0,05 S2.
rts by basic insulation
9.8 In cable reels having accessible parts insulated from live pa
only, the connection between the earthing terminal for the incoming flexible cable and
accessible metal parts of the cable reel shall be of low electrical resistance.
Compliance is checked by the following measurement which is made after the test
specified in clause 21.
A current derived from an a.c. source, having a no load voltage not exceeding 12 V, and
equal to 1,5 times rated current of the flexible cable or 25 A, whichever is the greater, is
passed through the earthing circuit. The voltage drop is measured and the resistance
calculated from the current and this voltage drop.
O.
The resistance shall not exceed 0,1
---------------------- Page: 24 ----------------------
SIST EN 61242:1997
1242 © IEC:1995 - 25 -
9.9 Internal movable earth contacts, e.g. slip rings, of cable reels shall be as follows:
9.9.1 Movable earth contacts between the terminal for the earthing conductor of the
incoming flexible cable and the earthing terminal for the outgoing flexible cable or that of
the socket-outlet shall be duplicated.
One of these shall be a slip ring or an equally effective contact, while the other may be a
ball bearing, a plain bearing or the like, as long as it is of metal.
9.9.2 Movable earth contacts between the terminal for the earthing conductor of the
incoming flexible cable and accessible metal parts of the cable reel shall be duplicated,
each of which may be a ball bearing, a plain bearing or the like, if of metal.
10 Terminals and terminations
10.1 Non-rewirable cable reels shall be provided with terminations which shall be
soldered, welded, crimped or equally effective non-reusable connections.
Connections made by crimping a pre-soldered flexible conductor are not permitted, unless
the soldered area is outside the crimping area.
Compliance is checked by inspection.
10.2 Rewirable cable reels shall be provided with screw-type terminals for external
copper conductors.
The means for clamping the conductors in the terminal shall not serve to fix any other
component, although they may hold the terminals in place or prevent them from turning.
Internal connections shall be independent of the connection of the external flexible cable.
NOTE — An internal connection is considered independent if the conductor of any internal wiring maintains
its correct position in the terminal when replacing the external flexible cable.
Compliance is checked by inspection.
10.3 Terminals with screw clamping for external copper conductors
10.3.1 Cable reels shall be provided with terminals which shall allow the proper
connection of copper conductors having nominal cross-sectional areas as shown in table 1.
---------------------- Page: 25 ----------------------
SIST EN 61242:1997
1242 © IEC:1995 - 27 -
Table 1 - Nominal cross-sectional area of conductors
Rigid (solid or stranded)
Flexible copper conductors
copper conductors
Rated
Diameter of
Nominal Diameter of Nominal
current
largest cross-sectional largest
cross-sectional
conductor area conductor
area
mm mm2 mm
A mm2
From 0,75 up to
Portable cable reels up
and including 1,5 1,8
to and including 16 A – –
From 0,75 up to
Fixed cable reels up to From 1 up to and
2,2 and including 1,5 1,8
and
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.