Safety of transformers, reactors, power supply units and combinations thereof - Part 2-5: Particular requirements and test for transformer for shavers, power supply units for shavers and shaver supply units

IEC 61558-2-5:2010 deals with the safety of shaver transformers, power supply units incorporating a shaver transformer, and shaver supply units. Shaver transformers incorporating electronic circuits are also covered by this standard. This second edition cancels and replaces the first edition published in 1997. It constitutes a technical revision. The main changes consist of updating this part in accordance with IEC 61558-1:2005 and adding power supply units to the scope. This part has the status of a group safety publication in accordance with IEC Guide 104. The attention of National Committees is drawn to the fact that equipment manufacturers and testing organizations may need a transitional period following publication of a new, amended or revised IEC publication in which to make products in accordance with the new requirements and to equip themselves for conducting new or revised tests. It is the recommendation of the committee that the content of this publication be adopted for implementation nationally not earlier than 12 months from the date of publication. In the meantime, the previous edition can still be ordered by contacting your local IEC member National Committee or the IEC Central Office.
This publication is to be read in conjunction with IEC 61558-1:2005.

Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des combinaisons de ces éléments - Partie 2-5: Règles particulières et essais pour les transformateurs pour rasoirs, blocs d'alimentation incorporant un transformateur pour rasoirs et blocs d'alimentation pour rasoirs

La CEI 61558-2-5:2010 traite de la sécurité des transformateurs pour rasoirs, blocs d'alimentation incorporant un transformateur pour rasoirs et blocs d'alimentation pour rasoirs. Les transformateurs incorporant des circuits électroniques sont également couverts par la présente norme. Cette deuxième édition annule et remplace la première édition publiée en 1997. Elle constitue une révision technique. Les principales modifications comprennent la mise à jour de la présente partie conformément à la CEI 61558-1:2005, et l'ajout des blocs d'alimentation dans le domaine d'application. La présente partie a le statut de publication groupée de sécurité conformément au Guide CEI 104. L'attention des Comités Nationaux est attirée sur le fait que les fabricants d'appareils et les organismes d'essai peuvent avoir besoin d'une période transitoire après la publication d'une nouvelle publication CEI, ou d'une publication amendée ou révisée, pour fabriquer des produits conformes aux nouvelles exigences et pour adapter leurs équipements aux nouveaux essais ou aux essais révisés. Le comité recommande que le contenu de cette publication soit entériné au niveau national au plus tôt 12 mois après la date de publication. Pendant ce temps, l'édition précédente peut toujours être commandée auprès du Comité National CEI de votre pays ou auprès du bureau Central de la CEI.
Cette publication doit être lue conjointement avec la CEI 61558-1:2005.

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Status
Published
Publication Date
28-Jun-2010
Current Stage
PPUB - Publication issued
Start Date
29-Jun-2010
Completion Date
29-Jun-2010
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IEC 61558-2-5
Edition 2.0 2010-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Safety of transformers, reactors, power supply units and combinations thereof –
Part 2-5: Particular requirements and test for transformer for shavers, power
supply units for shavers and shaver supply units
Sécurité des transformateurs, bobines d’inductance, blocs d’alimentation et des
combinaisons de ces éléments –

Partie 2-5: Règles particulières et essais pour les transformateurs pour rasoirs,

blocs d’alimentation incorporant un transformateur pour rasoirs et blocs
d’alimentation pour rasoirs
IEC 61558-2-5:2010
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
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---------------------- Page: 2 ----------------------
IEC 61558-2-5
Edition 2.0 2010-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Safety of transformers, reactors, power supply units and combinations thereof –
Part 2-5: Particular requirements and test for transformer for shavers, power
supply units for shavers and shaver supply units
Sécurité des transformateurs, bobines d’inductance, blocs d’alimentation et des
combinaisons de ces éléments –

Partie 2-5: Règles particulières et essais pour les transformateurs pour rasoirs,

blocs d’alimentation incorporant un transformateur pour rasoirs et blocs
d’alimentation pour rasoirs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 29.180 ISBN 978-2-88912-035-2
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 61558-2-5 © IEC:2010
CONTENTS

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

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

2 Normative references........................................................................................................6

3 Terms and definitions .......................................................................................................6

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

5 General notes on tests......................................................................................................6

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

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

8 Marking and other information...........................................................................................7

9 Protection against electric shock.......................................................................................8

10 Change of input voltage setting .........................................................................................8

11 Output voltage and output current under load ....................................................................8

12 No-load output voltage......................................................................................................8

13 Short-circuit voltage..........................................................................................................9

14 Heating.............................................................................................................................9

15 Short-circuit and overload protection .................................................................................9

16 Mechanical strength..........................................................................................................9

17 Protection against harmful ingress of dust, solid objects and moisture.............................10

18 Insulation resistance, dielectric strength, and leakage current .........................................10

19 Construction ...................................................................................................................10

20 Components ...................................................................................................................12

21 Internal wiring .................................................................................................................13

22 Supply connection and other external flexible cables or cords..........................................13

23 Terminals for external conductors ...................................................................................13

24 Provision for protective earthing......................................................................................13

25 Screws and connections .................................................................................................13

26 Creepage distances, clearances and distances through insulation ...................................13

27 Resistance to heat, fire, and tracking ..............................................................................13

28 Resistance to rusting ......................................................................................................14

Annexes................................................................................................................................15

Bibliography ..........................................................................................................................15

Table 101 – Values of heights of fall......................................................................................10

---------------------- Page: 4 ----------------------
61558-2-5 © IEC:2010 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
SAFETY OF TRANSFORMERS, REACTORS,
POWER SUPPLY UNITS AND COMBINATIONS THEREOF –
Part 2-5: Particular requirements and test for transformer for shavers,
power supply units for shavers and shaver supply units
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

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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

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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

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.

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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 61558-2-5 has been prepared by IEC technical committee 96:

Transformers, reactors, power supply units and combinations thereof.

This second edition cancels and replaces the first edition published in 1997. It constitutes a

technical revision. The main changes consist of updating this part in accordance with IEC

61558-1:2005 and adding power supply units to the scope.

This part has the status of a group safety publication in accordance with IEC Guide 104: 1997,

The preparation of safety publications and the use of basic safety publications and group

safety publications.
---------------------- Page: 5 ----------------------
– 4 – 61558-2-5 © IEC:2010
The text of this standard is based on the following documents:
FDIS Report on voting
96/353/FDIS 96/360/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 ISO/IEC Directives, Part 2.

This part is intended to be used in conjunction with the latest edition of IEC 61558-1 and its

amendments. It is based on the second edition (2005) of that standard.

This part supplements or modifies the corresponding clauses in IEC 61558-1, so as to convert

that publication into the IEC standard: Particular requirements and test for transformer for

shavers, power supply units for shavers and shaver supply units.

A list of all parts of the IEC 61558 series, under the general title: Safety of transformers,

reactors, power supply units and combinations thereof, can be found on the IEC website.

Future standards in this series will carry the new general title as cited above. Titles of existing

standards in this series will be updated at the time of the next edition.

Where a particular subclause of Part 1 is not mentioned in this part, that subclause applies as

far as is reasonable. Where this part states "addition", "modification" or "replacement", the

relevant text of Part 1 is to be adopted accordingly.
In this part, the following print types are used:
– requirements proper: in roman type;
– test specifications: in italic type;
– explanatory matters: in smaller roman type.
In the text of this part, the words in bold are defined in Clause 3.

Subclauses additional to those in Part 1 are numbered starting from 101; supplementary

annexes are entitled AA, BB, etc.

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.

NOTE The attention of National Committees is drawn to the fact that equipment manufacturers and testing

organizations may need a transitional period following publication of a new, amended or revised IEC publication in

which to make products in accordance with the new requirements and to equip themselves for conducting new or

revised tests.

It is the recommendation of the committee that the content of this publication be adopted for implementation

nationally not earlier than 12 months from the date of publication.
---------------------- Page: 6 ----------------------
61558-2-5 © IEC:2010 – 5 –
SAFETY OF TRANSFORMERS, REACTORS,
POWER SUPPLY UNITS AND COMBINATIONS THEREOF –
Part 2-5: Particular requirements and test for transformer for shavers,
power supply units for shavers and shaver supply units
1 Scope
Replacement:

This part of IEC 61558 deals with the safety of shaver transformers, power supply units

incorporating a shaver transformer, and shaver supply units. Shaver transformers
incorporating electronic circuits are also covered by this standard.
NOTE 1 Safety includes electrical, thermal, mechanical and chemical aspects.
Unless otherwise specified, from here onward, the term transformer covers shaver
transformers and power supply units incorporating shaver transformers and shaver
supply units.

This part is applicable to stationary, single phase air-cooled (natural or forced), independent

or associated dry- type transformers. The windings may be encapsulated or non-
encapsulated.

This standard is applicable to transformers and power supply (linear) with internal

operational frequencies not exceeding 500 Hz.

This standard used in combination with Part 2-16 for switch mode power supply units

(SMPS) is also applicable to power supplies with internal operational frequencies higher than

500 Hz. Where the two requirements are in conflict the most severe take precedence.

The rated supply voltage does not exceed 250 V a.c., and the rated supply frequency does

not exceed 500 Hz.
The rated output is not less than 20 VA and does not exceed 50 VA .

The no-load output voltage does not exceed 275 V a.c and the rated output voltage does

not exceed 250 V a.c.

This part is not applicable to external circuits and their components intended to be connected

to the input and output terminals or socket-outlets of the transformers.

Transformers covered by this part are used in applications where double or reinforced

insulation between circuits is required by the installation rules for bathrooms and similar

locations, or by the appliance specifications.

NOTE 2 Transformers covered by this part may be flush or surface mounted or incorporated in luminaires,

mirrors, and other equipment containing one or more socket-outlet(s).
NOTE 3 Attention is drawn to the following:

- for transformers intended to be used in vehicles, on board ships, and aircraft, additional requirements (from

other applicable standards, national rules, etc.) may be necessary;
---------------------- Page: 7 ----------------------
– 6 – 61558-2-5 © IEC:2010

- measures to protect the enclosure and the components inside the enclosure against external influences such

as fungus, vermin, termites, solar-radiation, and icing should also be considered;

- the different conditions for transportation, storage, and operation of the transformers should also be

considered;

- additional requirements in accordance with other appropriate standards and national rules may be applicable to

transformers intended for use in special environments.

NOTE 4 Future technological development of transformers may necessitate a need to increase the upper limit of

the frequencies, until then this part may be used as a guidance document.
2 Normative references
This clause of Part 1 is applicable except as follows:
Addition:

IEC 60068-2-62:1:1991, Environmental testing – Part 2: Test methods – Test Ef: Impact,

pendulum hammer

IEC 60670 (all parts), Boxes and enclosures for electrical accessories for household and

similar fixed electrical installations

IEC 61558-1 :2005, Safety of power transformers, power supplies, reactors and similar

products – Part 1: General requirements and tests
3 Terms and definitions
This clause of Part 1 is applicable except as follows:
Addition:
3.1.101
shaver transformer

isolating transformer for fixed installation and with a limited output, designed to supply

electric shavers, toothbrushes, and similar appliances rated 50 VA or less used in a bathroom.

It supplies only one shaver, or the like, at a time
3.1.102
shaver supply unit

accessory embodying a shaver transformer or a power supply unit incorporating a shaver

transformer, and one or more socket outlets allowing the use of only one plug at a time

4 General requirements
This clause of Part 1 is applicable.
5 General notes on tests
This clause of Part 1 is applicable.
___________

This publication was withdrawn and replaced by IEC 60068-2-75 (1997), but for the purposes of this standard,

the IEC 60068-2-62 is cited.
---------------------- Page: 8 ----------------------
61558-2-5 © IEC:2010 – 7 –
6 Ratings
Replacement:
6.101 The rated output voltage shall not exceed 250 V a.c.
6.102 The rated output shall not be less than 20 VA and shall not exceed 50 VA.

6.103 The rated supply frequency and internal operating frequency shall not exceed

500 Hz.
6.104 The rated supply voltage shall not exceed 250 V a.c.

Compliance with the requirements 6.101 to 6.104 is checked by inspection of the marking.

7 Classification
This clause of Part 1 is applicable except as follows:
7.2 Replacement:
According to short-circuit protection or protection against abnormal conditions:
– inherently short-circuit proof transformer;
– non-inherently short-circuit proof transformer.
8 Marking and other information
This clause of Part 1 is applicable except as follows:
8.1 h) Replacement of the first sentence by the following:
relevant graphical symbols shown in 8.11 indicating the kind of transformer;
8.1 n) Modification:
indication of the protection code IP for transformers, if higher than IP00;

indication of the protection code IP for shaver supply units, if higher than IP21.

8.7 Addition:

For shaver supply units provided with a single-pole switch, the switched pole shall be

connected to the line.
---------------------- Page: 9 ----------------------
– 8 – 61558-2-5 © IEC:2010
8.11 Addition:
Symbol or graphical symbol Explanation or title Identification
Shaver supply units and transformers IEC 60417-
5225 (2009-
05)
8.13 Addition:

For shaver supply units, the marking for rated output voltage(s) and for the symbol of 8.11

shall be indicated on the front of the enclosure so as to be visible when the unit is mounted as

in normal use. For shaver supply units intended to provide different output voltages, the

selected output voltage setting shall be clearly discernible.

For transformers, the marking with the symbol of 8.11 shall be provided only if the

transformer is supplied separately.
9 Protection against electric shock
This clause of Part 1 is applicable.
10 Change of input voltage setting
This clause of Part 1 is applicable.
11 Output voltage and output current under load
This clause of Part 1 is applicable.
12 No-load output voltage
This clause of Part 1 is applicable except as follows:
Addition:
12.101 The no-load output voltage shall not exceed 275 V a.c.

For independent transformers, this output voltage limitation applies even when output

windings, not intended for interconnection, are connected in series.

12.102 The difference between the no-load output voltage and the output voltage under

load shall not be excessive.

Compliance with the requirements of 12.101 and 12.102 is checked by measuring the no-load

output voltage at the ambient temperature when the transformer is connected to the rated

supply voltage at the rated supply frequency.
---------------------- Page: 10 ----------------------
61558-2-5 © IEC:2010 – 9 –

The difference between the no-load output voltage measured in this clause and the output

voltage under load measured during the test of Clause 11, expressed as a percentage of the

latter voltage, shall not exceed 20 %.
U – U
no-load
load
NOTE The ratio is defined as follows: × 100 %
load
13 Short-circuit voltage
This clause of Part 1 is applicable.
14 Heating
This clause of Part 1 is applicable.
15 Short-circuit and overload protection
This clause of Part 1 is applicable.
16 Mechanical strength
This clause of Part 1 is applicable except as follows:
16.1 Replacement:
For shaver supply units, compliance is checked by the test of 16.101.
Addition:
16.101 Shaver supply units are subjected to blows by means of a pendulum hammer,
defined as follows:
16.101.1 Blows are applied to the specimen according to IEC 60068-2-62.

For shaver supply units other than flush-type mounted, the specimen is mounted as

described in 4.2 of IEC 60068-2-62.

For flush-type shaver supply units, the specimen is mounted as shown in Figure 3 of

IEC 60068-2-62.

Flush-type equipment intended to be installed by means of screws to lugs recessed in the

mounting block; flush-type equipment for claw fixing is fixed directly to the block by means of

the claws.

The specimen is mounted as in normal use such that the point of impact lies in the vertical

plane through the axis of the pivot of the pendulum.

Before applying the blows, mounting screws of bases, covers and the like are tightened with a

torque equal to two thirds of that specified in Table 11 of 25.1 of Part 1.

The striking element is allowed to fall from a height equal to that shown in Table 101.

---------------------- Page: 11 ----------------------
– 10 – 61558-2-5 © IEC:2010
Table 101 – Values of heights of fall
Height of fall Approximate energy Relevant parts
cm J
0,2 Cover plates of shaver supply units
10 ± 0,1
for flush-type mounting and for those
parts which are recessed to a depth
of at least one quarter of the largest
dimension of the recessed part
0,3
15 ± 0,1 Enclosures
0,5 Other parts
25 ± 0,1

16.101.2 The specimens shall be subjected to 10 blows which are evenly distributed over the

sample.
Five blows shall be applied as follows:

– for shaver supply units intended to be flush mounted, one blow in the centre, one at each

extremity of the area over the recess in the block, and the other two approximately midway

between the previous blows, the specimen being moved horizontally;

– for shaver supply units not intended for flush-type mounting, one blow in the centre, one

on each side of the specimen after it has been turned as far as possible, but not through

more than 60° about a vertical axis, and the other two approximately midway between the

previous blows.

The remaining blows are then applied in the same way after the specimen has been turned

around through 90°of its axis perpendicular to the plywood.

If cable entries are provided, the specimen shall be mounted such that the two lines of the

blows are as far as possible and equidistant from these entries.

16.101.3 After the test, the specimen shall show no damage within the meaning of this

standard. In particular, live parts shall not become accessible.

NOTE 1 Damage to the finish, small dents which do not reduce creepage distances or clearances below the

values specified in Clause 26, and small chips which do not adversely affect the protection against electric shock or

moisture are disregarded.

NOTE 2 Cracks not visible with normal vision or corrected vision without magnification and surface cracks in fibre

reinforced mouldings and the like are disregarded.
17 Protection against harmful ingress of dust, solid objects and moisture
This clause of Part 1 is applicable.
18 Insulation resistance, dielectric strength, and leakage current
This clause of Part 1 is applicable.
19 Construction
This clause of Part 1 is applicable except as follows:
19.1 Replacement:
---------------------- Page: 12 ----------------------
61558-2-5 © IEC:2010 – 11 –

The input and output circuits shall be electrically separated from each other, and the

construction shall be such that there is no possibility of any connection between these circuits,

either directly or indirectly, via other conductive parts, except by deliberate action.

Compliance is checked by inspection and measurements, taking Clauses 18 and 26 into

consideration.

19.1.1 The insulation between input and output winding(s) shall consist of double or

reinforced insulation (rated for the working voltage).
In addition, the following applies:

class I transformers not intended for connection to the mains supply by means of a

– for

plug, the insulation between the input windings and the body connected to earth shall

consist of at least basic insulation rated for the input voltage. The insulation between

the output windings and the body connected to earth, shall consist of at least basic

insulation (rated for the output voltage);

– for class I transformers intended for connection to the mains supply by means of a

plug, the insulation between the inp
...

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