SIST EN 61558-2-7:2008

Safety of power transformers, power supplies, reactors and similar products -- Part 2-7: Particular requirements and tests for transformers and power supplies for toys

This part of IEC 61558 deals with safety aspects of transformers for toys and power supplies incorporating transformers for toys such as electrical, thermal and mechanical safety. This Part 2-7 is applicable to transformers for toys and power supplies incorporating both transformers for toys and electronic circuits. This Part 2-7 is not applicable to external circuits and their components intended to be connected to the input terminals, output terminals or socket-outlets of the transformers and power supplies. This Part 2-7 applies to stationary and portable, single-phase, air-cooled (natural or forced), transformers for toys and power supplies incorporating transformers for toys, having a rated supply voltage not exceeding 250 V a.c., a rated supply and internal operating frequency not exceeding 500 Hz, a rated output not exceeding 200 VA and a rated output current not exceeding 10 A. This Part 2-7 is applicable to independent transformers and transformers for specific use. This Part 2-7 is applicable to dry-type transformers for toys. The windings may be encapsulated or non-encapsulated. The no-load output voltage does not exceed 33 V a.c. for transformers for toys and power supplies incorporating transformers for toys, or 46 V ripple-free d.c. for power supplies incorporating transformers for toys, and the rated output voltage does not exceed 24 V a.c. for transformers and power supplies , or 33 V ripple-free d.c. for power supplies . In general, this Part 2-7 does not take into consideration children playing with the transformers for toys and power supplies incorporating transformers for toys.

Sicherheit von Transformatoren, Netzgeräten, Drosseln und dergleichen -- Teil 2-7: Besondere Anforderungen und Prüfungen an Transformatoren für Spielzeuge

Sécurité des transformateurs, alimentations, bobines d'inductance et produits analogues -- Partie 2-7: Règles particulières et essais pour transformateurs et alimentations pour jouets

La présente partie de la CEI 61558 traite des aspects relatifs à la sécurité des transformateurs pour jouets et des alimentations incorporant des transformateurs pour jouets tels que les aspects de sécurité électrique, thermique et mécanique. Cette deuxième édition annule et remplace la première édition publiée en 1997. Elle constitue une révision technique. Les principales modifications consistent en la mise à jour de cette Partie 2-7 conformément à la Partie 1 édition 2, et en l'ajout des alimentations dans le domaine d'application. Cette Partie 2-7 a le statut de publication groupée de sécurité conformément au guide  CEI 104.

Varnost močnostnih transformatorjev, napajalnikov, reaktorjev in podobnih izdelkov - 2-7. del: Posebne zahteve za transformatorje in napajalnike za igrače (IEC 61558-2-7:2007, spremenjen)

General Information

• Status: Published
• Publication Date: 28-Nov-2007
• ICS: 29.180 - Transformers. Reactors
• ICS: 97.200.50 - Toys
• Technical Committee: MTR - Instrument transformers
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 27-Nov-2007
• Due Date: 01-Feb-2008
• Completion Date: 29-Nov-2007
• Directive: 2006/95/EC - Directive 2006/95/EC of the European Parliament and of the Council of 12 December 2006 on the harmonisation of the laws of Member States relating to electrical equipment designed for use within certain voltage limits (codified version)
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Directive: 73/23/EEC - Electrical equipment designed for use within certain voltage limits
• Ref Project: EN 61558-2-7:2007 - Safety of power transformers, power supplies, reactors and similar products - Part 2-7: Particular requirements and tests for transformers and power supplies for toys

Relations

• Replaces: SIST EN 61558-2-7:1999/A11:2003 - Safety of power transformers, power supply units and similar -- Part 2-7: Particular requirements for transformers for toys
• Effective Date: 01-Sep-2010
• Replaces: SIST EN 61558-2-7:1999 - Safety of power transformers, power supply units and similar -- Part 2-7: Particular requirements for transformers for toys
• Effective Date: 01-Sep-2010
• Replaces: SIST EN 61558-2-7:1999 - Safety of power transformers, power supply units and similar -- Part 2-7: Particular requirements for transformers for toys
• Effective Date: 28-Jan-2023
• Replaces: SIST EN 61558-2-7:1999/A11:2003 - Safety of power transformers, power supply units and similar -- Part 2-7: Particular requirements for transformers for toys
• Effective Date: 28-Jan-2023
• Replaces: SIST EN 61558-2-7:1999/A11:2003 - Safety of power transformers, power supply units and similar -- Part 2-7: Particular requirements for transformers for toys
• Effective Date: 07-Jun-2022
• Replaces: SIST EN 61558-2-7:1999 - Safety of power transformers, power supply units and similar -- Part 2-7: Particular requirements for transformers for toys
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 61558-2-7:2008
01-januar-2008
1DGRPHãþD
SIST EN 61558-2-7:1999
SIST EN 61558-2-7:1999/A11:2003
9DUQRVWPRþQRVWQLKWUDQVIRUPDWRUMHYQDSDMDOQLNRYUHDNWRUMHYLQSRGREQLK
L]GHONRYGHO3RVHEQH]DKWHYH]DWUDQVIRUPDWRUMHLQQDSDMDOQLNH]DLJUDþH
,(&VSUHPHQMHQ
Safety of power transformers, power supplies, reactors and similar products - Part 2-7:
particular requirements and tests for transformers for toys
Sicherheit von Transformatoren, Netzgeräten, Drosseln und dergleichen - Teil 2-7:
Besondere Anforderungen und Prüfungen an Transformatoren für Spielzeuge
Sécurité des transformateurs, alimentations, bobines d'inductance et produits analogues
- Partie 2-7: Regles particulieres et essais pour transformateurs et alimentations pour
jouets
Ta slovenski standard je istoveten z: EN 61558-2-7:2007
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
SIST EN 61558-2-7:2008 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

EUROPEAN STANDARD
EN 61558-2-7

NORME EUROPÉENNE
October 2007
EUROPÄISCHE NORM

ICS 29.180 Supersedes EN 61558-2-7:1997 + A11:2002


English version


Safety of power transformers, power supplies,
reactors and similar products -
Part 2-7: Particular requirements and tests
for transformers and power supplies for toys
(IEC 61558-2-7:2007, modified)


Sécurité des transformateurs, Sicherheit von Transformatoren,
alimentations, bobines d'inductance Netzgeräten, Drosseln und dergleichen -
et produits analogues - Teil 2-7: Besondere Anforderungen
Partie 2-7: Règles particulières und Prüfungen an Transformatoren
et essais pour transformateurs für Spielzeuge
et alimentations pour jouets (IEC 61558-2-7:2007, modifiziert)
(CEI 61558-2-7:2007, modifiée)




This European Standard was approved by CENELEC on 2007-09-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61558-2-7:2007 E

---------------------- Page: 2 ----------------------

EN 61558-2-7:2007 – 2 –
Foreword
The text of document 96/254/FDIS, future edition 2 of IEC 61558-2-7, prepared by IEC TC 96,
Transformers, reactors, power supply units and similar products for low voltage up to 1 100 V, was
submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61558-2-7 on
2007-09-01 with inclusion of a common modification intended to align this European Standard with
EN 62115:2005.
This European Standard supersedes EN 61558-2-7:1997 + A11:2002.
The main changes consist of updating EN 61558-2-7:1997, in accordance with EN 61558-1:2005, and
adding power supplies to the scope.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2008-06-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-09-01
This Part 2-7 is intended to be used in conjunction with EN 61558-1:2005.
This Part 2-7 supplements or modifies the corresponding clauses in EN 61558-1, so as to convert that
publication into the European Standard: Particular requirements and tests for transformers and power
supplies for toys.
When a particular subclause of Part 1 is not mentioned in this Part 2-7, that subclause applies as far as is
reasonable. Where this standard states "addition", "modification" or "replacement", the relevant text of
Part 1 is to be adapted accordingly.
In this Part 2-7, the following print types are used:
– requirements proper: in roman type;
– test specifications: in italic type;
– explanatory matter: in smaller roman type.
In the text of this standard, 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.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61558-2-7:2007 was approved by CENELEC as a European
Standard with agreed common modifications as given below.
COMMON MODIFICATIONS
Replace subclause 20.103 by:
20.103 The operating means of control devices, if any, shall not be affixed to the transformers.
__________

---------------------- Page: 3 ----------------------

– 3 – EN 61558-2-7:2007

Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

Addition to Annex ZA of EN 61558-1:

Publication Year Title EN/HD Year
1)
IEC 60227-1 – Polyvinyl chloride insulated cables of rated – –
voltages up to and including 450/750 V -
Part 1: General requirements


2)
IEC 60245-1 – Rubber insulated cables - Rated voltages up – –
to and including 450/750 V -
Part 1: General requirements




1)
Undated reference. HD 21.1 S4:2002, Cables of rated voltages up to and including 450/750 V and having thermoplastic
insulation - Part 1: General requirements, which is related to, but not directly equivalent with, IEC 60227-1, applies instead.
2)
Undated reference. HD 22.1 S4:2002, Cables of rated voltages up to and including 450/750 V and having cross-linked
insulation - Part 1: General requirements, which is related to, but not directly equivalent with, IEC 60245-1, applies instead.

---------------------- Page: 4 ----------------------

NORME CEI
INTERNATIONALE
IEC



61558-2-7
INTERNATIONAL


Deuxième édition
STANDARD

Second edition

2007-01


PUBLICATION GROUPÉE DE SÉCURITÉ
GROUP SAFETY PUBLICATION
Sécurité des transformateurs, alimentations,
bobines d'inductance et produits analogues –
Partie 2-7:
Règles particulières et essais pour transformateurs
et alimentations pour jouets

Safety of power transformers, power supplies,
reactors and similar products –
Part 2-7:
Particular requirements and tests for transformers
and power supplies for toys



© IEC 2007 Droits de reproduction réservés ⎯ Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photo-copie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
CODE PRIX
R
Commission Electrotechnique Internationale
PRICE CODE
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

---------------------- Page: 5 ----------------------

61558-2-7 © IEC:2007 – 3 –
CONTENTS
FOREWORD.5

1 Scope.9
2 Normative references .11
3 Terms and definitions .11
4 General requirements .11
5 General notes on tests .11
6 Ratings.13
7 Classification.13
8 Marking and other information .15
9 Protection against electric shock .15
10 Change of input voltage setting .17
11 Output voltage and output current under load .17
12 No-load output voltage .19
13 Short-circuit voltage .19
14 Heating .19
15 Short-circuit and overload protection .21
16 Mechanical strength .21
17 Protection against harmful ingress of dust, solid objects and moisture.25
18 Insulation resistance, dielectric strength and leakage current .25
19 Construction .25
20 Components .27
21 Internal wiring.31
22 Supply connection and other external flexible cables or cords .31
23 Terminals for external conductors.31
24 Provisions for protective earthing .31
25 Screws and connections .31
26 Creepage distances, clearances, and distances through insulation.33
27 Resistance to heat, abnormal heat, fire and tracking .33
28 Resistance to rusting.33

Figure 101 – Small test finger .17
Figure 102 – Arrangement for impact test for transformers (see 16.101) .23

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61558-2-7 © IEC:2007 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________

SAFETY OF POWER TRANSFORMERS, POWER SUPPLIES,
REACTORS AND SIMILAR PRODUCTS –

Part 2-7: Particular requirements and tests
for transformers and power supplies for toys


FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may Participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also Participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International standard IEC 61558-2-7 has been prepared by IEC technical committee 96:
Small power transformers, reactors, power supply units and similar products.
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 2-7, in accordance with
Part 1, edition 2, and adding power supplies to the scope.
This Part 2-7 has the status of a group safety publication in accordance with IEC Guide 104:
The preparation of safety publications and the use of basic safety publications and group
safety publications (1997).

---------------------- Page: 7 ----------------------

61558-2-7 © IEC:2007 – 7 –
The text of this standard is based on the following documents:
FDIS Report on voting
96/254/FDIS 96/267/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This Part 2-7 is intended to be used in conjunction with the last edition of IEC 61558-1 and its
amendments. It is based on the second edition (2005) of that standard.
This Part 2-7 supplements or modifies the corresponding clauses in IEC 61558-1, so as to
convert that publication into the IEC standard: Particular requirements and tests for
transformers and power supplies for toys.
The list of all the parts of the IEC 61558 series, under the general title Safety of power
transformers, power supply units and similar products, can be found on the IEC website.
When a particular subclause of Part 1 is not mentioned in this Part 2-7, that subclause applies
as far as is reasonable. Where this standard states "addition", "modification" or
"replacement", the relevant text of Part 1 is to be adapted accordingly.
In this Part 2-7, the following print types are used:
– requirements proper: in roman type;
– test specifications: in italic type;
– explanatory matter: in smaller roman type.
In the text of this standard, 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 maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.

---------------------- Page: 8 ----------------------

61558-2-7 © IEC:2007 – 9 –
SAFETY OF POWER TRANSFORMERS, POWER SUPPLIES
REACTORS AND SIMILAR PRODUCTS –

Part 2-7: Particular requirements and tests
for transformers and power supplies for toys



1 Scope
Replacement:
This part of IEC 61558 deals with safety aspects of transformers for toys and power
supplies incorporating transformers for toys such as electrical, thermal and mechanical
safety.
This Part 2-7 is applicable to transformers for toys and power supplies incorporating both
transformers for toys and electronic circuits. This Part 2-7 is not applicable to external
circuits and their components intended to be connected to the input terminals, output
terminals or socket-outlets of the transformers and power supplies.
This Part 2-7 applies to stationary and portable, single-phase, air-cooled (natural or forced),
transformers for toys and power supplies incorporating transformers for toys, having a
rated supply voltage not exceeding 250 V a.c., a rated supply and internal operating
frequency not exceeding 500 Hz, a rated output not exceeding 200 VA and a rated output
current not exceeding 10 A.
This Part 2-7 is applicable to independent transformers and transformers for specific use.
This Part 2-7 is applicable to dry-type transformers for toys. The windings may be
encapsulated or non-encapsulated.
The no-load output voltage does not exceed 33 V a.c. for transformers for toys and power
supplies incorporating transformers for toys, or 46 V ripple-free d.c. for power supplies
incorporating transformers for toys, and the rated output voltage does not exceed 24 V
a.c. for transformers and power supplies, or 33 V ripple-free d.c. for power supplies.
In general, this Part 2-7 does not take into consideration children playing with
...

SLOVENSKI oSIST prEN 61558-2-7:2005

PREDSTANDARD
julij 2005
Varnost močnostnih transformatorjev, napajalnikov, reaktorjev in podobnih
izdelkov – 2-7. del: Posebne zahteve za transformatorje in napajalnike za
igrače
Safety of power transformers, power supplies, reactors and similar products – Part
2-7: Particular requirements for transformers and power supplies for toys
ICS 29.180 Referenčna številka
oSIST prEN 61558-2-7:2005(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

---------------------- Page: 1 ----------------------
96/226/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJET DE COMITÉ POUR VOTE (CDV)
Project number IEC 61558-2-7 Ed.2
Numéro de projet

IEC/TC or SC: Date of circulation Closing date for voting (Voting
TC 96
Date de diffusion mandatory for P-members)
CEI/CE ou SC:

Date de clôture du vote (Vote
2005-05-27
obligatoire pour les membres (P))
2005-10-28
Titre du CE/SC:    TC/SC Title: Safety of power transformers, power
supplies, reactors and similar products
Secretary: Wolfgang Reichelt
Secrétaire:
Also of interest to the following committees Supersedes document
Intéresse également les comités suivants Remplace le document
   96/173/CD, 96/181/CC
Functions concerned
Fonctions concernées
Safety EMC Environment Quality assurance
Sécurité
CEM Environnement Assurance qualité
CE DOCUMENT EST TOUJOURS À L'ÉTUDE ET SUSCEPTIBLE DE THIS DOCUMENT IS STILL UNDER STUDY AND SUBJECT TO CHANGE. IT
MODIFICATION. IL NE PEUT SERVIR DE RÉFÉRENCE. SHOULD NOT BE USED FOR REFERENCE PURPOSES.
LES RÉCIPIENDAIRES DU PRÉSENT DOCUMENT SONT INVITÉS À RECIPIENTS OF THIS DOCUMENT ARE INVITED TO SUBMIT, WITH THEIR
PRÉSENTER, AVEC LEURS OBSERVATIONS, LA NOTIFICATION DES COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF
DROITS DE PROPRIÉTÉ DONT ILS AURAIENT ÉVENTUELLEMENT WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING
CONNAISSANCE ET À FOURNIR UNE DOCUMENTATION EXPLICATIVE. DOCUMENTATION.

Titre :    Title : IEC 61558-2-7: Saftety of power
transformers, power supplies, reactors and

similar products Part 2-7 Particular requirements
for transformers and power supplies for toys


Introductory note
This part 2 of IEC 61558 applies to stationary and portable, single-phase, air-cooled (natural
or forced), transformers and power supplies for toys, having a rated supply voltage not
exceeding 250 V a.c., a rated supply frequency not exceeding 500 Hz and internal
operating frequency up to 100 MHz, a rated output not exceeding 200 VA and a rated
output current not exceeding 10 A.
This standard is applicable to dry-type transformers for toys. The windings may be
encapsulated or non-encapsulated.

ATTENTION ATTENTION

CDV soumis en parallèle au vote (CEI) Parallel IEC CDV/CENELEC Enquiry
et à l’enquête (CENELEC)


Copyright © 2005 International Electrotechnical Commission, IEC. All rights reserved. It is
permitted to download this electronic file, to make a copy and to print out the content for the sole
purpose of preparing National Committee positions. You may not copy or "mirror" the file or
printed version of the document, or any part of it, for any other purpose without permission in
writing from IEC.
FORM CDV (IEC) 2002-08-09

---------------------- Page: 2 ----------------------
61558-2-7 Ed.2/CDV © IEC              – 2 –



INTERNATIONAL ELECTROTECHNICAL COMMISSION
_________

SAFETY OF POWER TRANSFORMERS, POWER SUPPLIES,
REACTORS AND SIMILAR PRODUCTS
Part 2-7: Particular requirements for transformers and power supplies for
toys


FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all
national electrotechnical committees (IEC National Committees). The object of the 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, 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.
2) The formal decisions or agreements of the 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
National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form of
standards, technical 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.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International standard IEC 61558-2-7 has been prepared by technical committee 96: Small
power transformers, reactors and power supply units and similar products.
Future standards in this series will carry the new title as cited above. Titles of existing
standards in this series will be updated at the time of the next revision.
It has the status of a group safety publication in accordance with IEC Guide 104: The
preparation of safety publications and the use of basic safety publications and group safety
publications (1997).

The text of this standard is based on the following documents:



Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.

---------------------- Page: 3 ----------------------
61558-2-7 Ed.2/CDV © IEC              – 3 –




This part 2 is intended to be used in conjunction with the latest Edition of IEC 60558-1 and its
amendments. It is based on the second edition of that standard.
This part 2 supplements or modifies the corresponding clauses in IEC 61558-1, so as to
convert that publication into the IEC standard: Particular requirements for transformers and
power supplies for toys

This standard replace Edition 1

Where a specific subclause of part 1 is not mentioned in this part 2, that subclause applies as
far as is reasonable. Where this standard states "addition", "modification" or "replacement",
the relevant text of part 1 is to be adapted accordingly.
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.
In the text of the standard the words in bold are defined in clause 3.
Subclauses which are additional to those in part 1 are numbered starting from 101;
supplementary annexes are entitled AA, BB, etc.
The committee has decided that this publication remains valid until 2009-12.
At this date, in accordance with the committee's decision, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.

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SAFETY OF POWER TRANSFORMERS, POWER SUPPLIES
REACTORS AND SIMILAR PRODUCTS
Part 2-7: Particular requirements for transformers and power supplies for
toys

1 Scope
Replacement:
This International standard deals with safety aspects such as electrical, thermal and
mechanical safety of transformers and power supplies for toys.
This standard is applicable to transformers and power supplies for toys incorporating
electronic circuits. This standard is not applicable to external circuits and their components
intended to be connected to the input and output terminals or socket- outlets of the
transformer and power supplies.
This part 2 of IEC 61558 applies to stationary and portable, single-phase, air-cooled (natural
or forced), transformers and power supplies for toys, having a rated supply voltage not
exceeding 250 V a.c., a rated supply frequency not exceeding 500 Hz and internal
operating frequency up to 100 MHz, a rated output not exceeding 200 VA and a rated
output current not exceeding 10 A.
This standard is applicable to dry-type transformers for toys. The windings may be
encapsulated or non-encapsulated.
The no-load output voltage does not exceed 33 V a.c. for transformers and power supplies,
or 46 V ripple free d.c. for power supplies, and the rated output voltage does not exceed 24
V a.c. for transformers and power supplies, or 33 V ripple free d.c. for power supplies.
This standard applies to transformer for toys being special safety isolating transformers .
In general, this standard does not take into consideration children playing with the
transformers and power supplies for toys.

NOTE 1 – Attention is drawn to the fact that :
- Measures to protect the enclosure and the components inside the enclosure against external influences like
fungus, vermin and termites, solar-radiation, and icing should also be considered.

- The different conditions for transportation, storage and operation of the transformers and power supplies for toys
should also be considered.
-additional requirements in accordance with other appropriate standards and national rules may be applicable to
transformers and power supplies for toys intended for use in special environments such as tropical
environment.
NOTE 2 – Future technological development of transformers and power supplies may necessitate a need to
increase the upper limit of the frequencies, until than this standard may be used as a guidance document.
2 Normative references
This clause of part 1 is applicable.
3 Definitions
This clause of part 1 is applicable except as follows:
Addition:
3.1.101
transformer for toys
safety isolating transformer designed to supply toys and having a rated output voltage not
exceeding 24 V a.c. or 33 V ripple-free d.c.

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3.1.102
Power supplies for toys
Power supply incorporating a transformer for toys having a rated output voltage not exceeding
24 V a.c. or 33 V ripple-free d.c
4 General requirements
This clause of part 1 is applicable.
5 General notes on tests
This clause of part 1 is applicable except as follows:
When the internal operating frequency is higher than 500 Hz for switch mode power supplies
the requirements of IEC 61558-2-16 shall also be fulfilled.
5.12 This subclause is not applicable.
6 Ratings
Replacement:
6.1 The rated output voltage shall not exceed 24 V a.c for transformers and power supplies
for toys or 33 V ripple-free d.c. for power supplies for toys.
6.2 The rated output shall not exceed 200 VA.
6.3 The rated supply frequency shall not exceed 500 Hz.
6.4 Transformers for toys shall have only one rated supply voltage not exceeding 250 V a.c.
6.5 The rated output current shall not exceed 10 A.
Compliance with the requirements of 6.1 to 6.5 is checked by inspection of the marking.
7 Classification
This clause of part 1 is applicable except as follows:
7.1 Replacement:
According to their protection against electric shock:
- transformers for toys shall be of class II construction
7.2 Replacement:
According to short-circuit protection or protection against abnormal conditions:
– inherently short-circuit-proof transformers;
– non-inherently short-circuit-proof transformers;
– fail-safe transformers.
7.4 Replacement:
According to their mobility:
– portable transformers;
– stationary transformers.
7.5 Replacement:
According to their duty-type:

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– continuous operation.
8 Marking and other information
This clause of part 1 is applicable except as follows:
8.1 Item h) Addition:
Transformers for power supplies and toys suitable for outdoor use shall be marked with
the appropriated graphical symbol shown in 8.11 and IP code:
8.1 Item n) Modification:
Transformers suitable for outdoor use shall be marked with the appropriate IP degree.

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8.11 Addition:
Graphical symbol Title and description Number of symbol in IEC
60417
Transformers for toys 5219
(inherently short-circuit-proof
transformers, non-inherently
short-circuit-proof transformers
or fail-safe transformers)


9 Protection against electric shock
This clause of part 1 is applicable except as follows:
9.1.2 Modification:
The standard test finger of figure 2 is replaced by the small test finger of figure 101.
9.1.2.1 Addition:
It shall not be possible to gain access to live parts of the input circuit, or to metal parts
separated from live parts by basic insulation only, even after the removal of covers, which
can be removed with the aid of a tool.
10 Change of input voltage setting
This clause of part 1 is applicable except as follows:
Replacement:
Transformers and power supplies for toys shall have only one rated supply voltage or
one supply voltage range.
Compliance is checked by inspection.
11 Output voltage and output current under load
This clause of part 1 is applicable except as follows:
11.1 Modification:
When the transformer or power supply for toys is connected to the rated supply voltage, at
the rated supply frequency and loaded with an impedance which would result in the rated
output at the rated output voltage and, for a.c. rated power factor, the output voltage shall
not differ from the rated value by more than 10 % for a.c. or 15 % for d.c.
This requirement is applicable to all output windings and their tapping.
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 33 V a.c. for transformers and power
supplies for toys or 46 V ripple-free d.c. for power supplies for toys. This limitation applies
even when independent output windings, not intended for interconnecti
...