IEC 61558-2-5:2010

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.

General Information

• Status: Published
• Publication Date: 28-Jun-2010
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: TC 96 - Transformers and reactors
• Drafting Committee: MT 1 - TC 96/MT 1
• Current Stage: DELPUB - Deleted Publication
• Start Date: 12-Aug-2024
• Completion Date: 01-Feb-2023

Relations

• Revises: IEC 61558-2-5:1997 - Safety of power transformers, power supply units and similar - Part 2-5: Particular requirements for shaver transformers and shaver supply units
• Effective Date: 05-Sep-2023
• Revised: IEC 61558-2-5:2024 - Safety of transformers, reactors, power supply units and combinations thereof - Part 2-5: Particular requirements and tests for transformers for shavers, power supply units for shavers and shaver supply units
• Effective Date: 05-Sep-2023

Overview

IEC 61558-2-5:2010 is an international standard published by the International Electrotechnical Commission (IEC) focusing on the safety requirements for transformers, reactors, power supply units, and their combinations, specifically designed for shavers. This standard outlines the particular requirements and test methods for shaver transformers, power supply units that incorporate shaver transformers, and shaver supply units, including those with electronic circuit integration.

This standard represents the second edition, replacing the original 1997 publication, and incorporates important updates aligning it with IEC 61558-1:2005. It also expands the scope to cover power supply units. Its application ensures the devices meet stringent safety criteria in electrical, thermal, mechanical, and chemical aspects.

Key Topics

• Scope of Application
  IEC 61558-2-5 applies to stationary, single-phase, air-cooled dry-type transformers used primarily in shaver power supplies. It covers both encapsulated and non-encapsulated windings with operational frequencies up to 500 Hz. For switch mode power supply units (SMPS) with frequencies higher than 500 Hz, this standard works alongside IEC 61558-2-16, applying the more stringent requirements where conflicts arise.

• Safety Requirements
  The standard focuses on ensuring protection against electric shock through requirements for double or reinforced insulation, mechanical strength, and resistance to heat, fire, and moisture ingress. It also sets parameters on electrical ratings, including input voltage not exceeding 250 V AC and output power rating between 20 VA and 50 VA.

• Testing Procedures
  IEC 61558-2-5 specifies rigorous test conditions such as no-load and short-circuit voltage assessments, insulation resistance, dielectric strength, heating, mechanical durability, and protection against dust and moisture. Testing ensures compliance with thermal limits, internal wiring integrity, and component suitability under operational stress.

• Marking and Information
  The standard mandates clear identification and comprehensive markings on the devices to provide users and installers with necessary information including ratings, input voltage settings, and safety instructions.

Applications

IEC 61558-2-5 caters specifically to electric shaver manufacturers and suppliers who require their transformers and power supplies to comply with international safety standards. These transformers are often embedded in bathroom appliances, mirrors, and luminaires with integrated shaver sockets. The standard provides assurance that the products are safe for consumer use in wet or humid environments where electrical safety is critical.

In addition to consumer appliances, this standard can be a crucial reference for regulatory bodies, testing laboratories, certification entities, and product designers focused on safe and reliable shaver power supply units. It supports manufacturers in meeting national regulations by aligning with IEC’s internationally recognized safety criteria.

Related Standards

• IEC 61558-1:2005 – General safety requirements for transformers, reactors, and power supply units; IEC 61558-2-5 is designed to be read in conjunction with this part.
• IEC 61558-2-16 – This part addresses switch mode power supply units, complementing IEC 61558-2-5 for higher frequency power supplies.
• IEC Guide 104:1997 – Provides guidance on preparation and use of group safety publications, under which IEC 61558-2-5 qualifies.

Manufacturers should also consider national and industry-specific standards when deploying transformers in vehicles, ships, or aircraft due to additional safety or environmental considerations.

---

Keywords: IEC 61558-2-5, shaver transformer safety, power supply safety, transformer testing, electrical transformer standards, shaver power supply units, IEC transformer standards, safety of electrical transformers, consumer appliance safety, dry-type transformers.

Standards Content (Sample)

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
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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
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
P
CODE PRIX
ICS 29.180 ISBN 978-2-88912-035-2
– 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

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
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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
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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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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6) All users should ensure that they have the latest edition of this publication.
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 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.
– 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.

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;

– 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.
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.
– 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.

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 %
U
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.

– 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:
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 input windings and the body shall consist of at least
basic insulation, and the insulation between the output windings and the body shall
consist of at least supplementary insulation (both basic and supplementary
insulations rated for the working voltage);
– for class II transformers, the insulation between the input windings and the body
shall consist of double or reinforced insulation (rated for the input voltage). The
insulation between the output windings and the body, shall consist of double or
reinforced insulation (rated for the output voltage).
19.1.2 For transformers with intermediate conductive parts (e.g. the iron core) not
connected to the body and located between the input and output windings the insulation
between the input windings and any intermediate conductive part shall consist of at least
basic insulation, and the insulation between the output windings and any intermediate
conductive part shall consist of at least supplementary insulation (both basic and
supplementary insulations rated for the working voltage);
NOTE 1 An intermediate conductive part not separated from the input or output windings or the body by at
least basic insulation is considered to be connected to the relevant part(s).
NOTE 2 Basic insulation and supplementary insulation are interchangeable.
In addition, the following applies:
– for class I transformers, the insulation between the input and output windings via the
intermediate conductive parts (even if they are connected to earth) shall consist of
double or reinforced insulation (rated for the working voltage);
– for class II transformers, the insulation between the input windings and the body,
and between the output windings and the body via the intermediate conductive
parts shall consist of double or reinforced insulation (rated for the input and output
voltage);
– for transformer different from independent (IP00), the insulation between the input and
output windings via the intermediate conductive parts shall consist of double or
reinforced insulation (rated for the working voltage).
NOTE 3 In this clause the possibility to consider the intermediate metal part connected to earth and consequently
to require basic insulation in both circuit (primary and secondary) is not allowed for the following reason:
– the intermediate metal part are normally the iron core made by laminated plates insulated each other by
oxide. It is not assured that all foils are correctly connected to the earth.
– for transformer different from independent it is not assured that in the final applications the iron core will
be connected to earth.
– 12 – 61558-2-5 © IEC:2010
Addition:
19.101 There shall be no connections between the output circuit and the protective earth.
19.102 There shall be no connections between the output circuit and the body.
Compliance is checked by inspection.
19.103 The input and output terminals for the connection of external wiring shall be so located
that the distance measured between the points of introduction of the conductors into these
terminals is not less than 25 mm. If a barrier is used to obtain this distance, the measurement
shall be made over and around the barrier and it shall be of insulating material and be
permanently fixed to the transformer.
Compliance is checked by inspection and by measurement, disregarding intermediate
conductive parts.
Addition:
19.111 Mounting boxes for transformers or shaver supply units for flush-type mounting
shall comply with IEC 60670 series.
Compliance is checked by inspection.
19.112 Shaver supply units shall be provided with socket-outlets in the output circuit. It
shall not be possible to insert more than one plug at the same time. It shall not be possible for
any of the plugs listed in 20.5 to be inserted so as to bridge two socket outlets.
Compliance is checked by inspection and by manual test.
19.113 Transformers and shaver supply units shall be inherently or non-inherently
short-circuit proof and they shall not incorporate fuses.
Compliance is checked by inspection.
20 Components
This clause of Part 1 is applicable except as follows:
20.4 Addition:
Shaver supply units may be provided with a changeover switch to provide different rated
output voltages and/or a single-pole switch in the input circuit; these switches may be of
micro-gap construction.
Compliance is checked by inspection.
20.5 Modification:
Socket outlets in the output circuits of shaver supply units shall accept one or more type of
plugs in accordance with IEC/TR 60083 and shall not have a protective earthing contact.
NOTE It is not necessary to check the socket outlet according to IEC 60884-1 as:

61558-2-5 © IEC:2010 – 13 –
• constructional, mechanical and material characteristics are already covered by the existing clauses of
61558-1;
• electrical tests (temperature rise, breaking capacity, normal operation) are not applicable as the socket
outlet is supplied by a transformer with limited power;
• for the protection against electric shock the requirements of this standard are considered sufficient as the
socket outlet is supplied by isolating transformer.
20.9 Replacement:
Transformers may be provided with self-resetting protective devices.
21 Internal wiring
This clause of Part 1 is applicable.
22 Supply connection and other external flexible cables or cords
This clause of Part 1 is applicable except as follows:
22.2 Addition:
Shaver supply units shall be provided with, or be designed for use with a mounting box. They
shall be designed such that the supply cable ends can be prepared for connection after the box
is mounted in position but before the unit is fitted into the box.
Shaver supply units shall be designed and constructed so as to permit easy introduction of
the supply conductors into the terminals, and provide adequate space within the box such that
after installation of the unit, the insulation of the supply conductors is unlikely to come into
contact with live parts of different polarity or with moving parts such as the spindle of a rotary
switch.
23 Terminals for external conductors
This clause of Part 1 is applicable.
24 Provision for protective earthing
This clause of Part 1 is applicable.
25 Screws and connections
This clause of Part 1 is applicable.
26 Creepage distances, clearances and distances through insulation
This clause of Part 1 is applicable.
27 Resistance to heat, fire, and tracking
This clause of Part 1 is applicable.

– 14 – 61558-2-5 © IEC:2010
28 Resistance to rusting
This clause of Part 1 is applicable.

61558-2-5 © IEC:2010 – 15 –
Annexes
The annexes of Part 1 are applicable.
Bibliography
The Bibliography of Part 1 is applicable except as follows:
Addition:
IEC 61558-2-16:2009, Safety of transformers, reactors, power supply units and similar
products for supply voltages up to 1 100 V – Part 2-16: Particular requirements and tests for
switch mode power supply units and transformers for switch mode power supply units

___________
– 16 – 61558-2-5 © CEI:2010
SOMMAIRE
AVANT-PROPOS .17
1 Domaine d’application.20
2 Références normatives .21
3 Termes et définitions .21
4 Exigences générales.22
5 Généralités sur les essais.22
6 Caractéristiques assignées .22
7 Classification .22
8 Marquage et autres indications .22
9 Protection contre les chocs électriques .23
10 Changement de la tension primaire d’alimentation.23
11 Tension secondaire et courant secondaire en charge .23
12 Tension secondaire à vide .23
13 Tension de court-circuit .24
14 Echauffements.24
15 Protection contre les courts-circuits et les surcharges .24
16 Résistance mécanique.24
17 Protection contre les effets nuisibles dus à la pénétration de poussière, d’objets
solides et de l’humidité .
18 Résistance d'isolement, rigidité diélectrique et courant de fuite .26
19 Construction .26
20 Composants .28
21 Conducteurs internes.28
22 Raccordement à l'alimentation et câbles souples externes .28
23 Bornes pour conducteurs externes .29
24 Dispositions en vue de la mise à la terre .29
25 Vis et connexions .29
26 Lignes de fuite, distances d’isolement et distances à travers l’isolation.29
27 Résistance à la chaleur, au feu et aux courants de cheminement .29
28 Protection contre la rouille .29
Annexes.30
Bibliographie .30

Tableau 101 – Valeurs des hauteurs de chute .25

61558-2-5 © CEI:2010 – 17 –
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
_____________
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

AVANT-PROPOS
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...