SIST EN 61558-2-8:2010

Safety of transformers, reactors, power supply units and combinations thereof - Part 2-8: Particular requirements and tests for transformers and power supply units for bells and chimes (IEC 61558-2-8:2010)

IEC 61558-2-8:2010 deals with the safety of bell and chime transformers and power supply units incorporating bell and chime transformers. Transformers incorporating electronic circuits are also covered by this standard. This second edition cancels and replaces the first edition published in 1998. It constitutes a technical revision. The main changes consist of updating this part in accordance with IEC 61558-1:2005. 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.

Sicherheit von Transformatoren, Drosseln, Netzgeräten und entsprechende Kombinationen - Teil 2-8: Besondere Anforderungen und Prüfungen an Transformatoren und Netzgeräten für Klingeln und Läutewerke (IEC 61558-2-8:2010)

Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des combinaisons de ces éléments - Partie 2-8: Règles particulières et essais pour les transformateurs et blocs d'alimentation pour sonneries et carillons (CEI 61558-2-8:2010)

La CEI 61558-2-8:2010 traite de la sécurité des transformateurs pour sonneries et carillons et des blocs d'alimentation incorporant des transformateurs pour sonneries et carillons. Les transformateurs incorporant des circuits électroniques sont également couverts par la présente norme. Cette deuxième édition annule et remplace la première édition publiée en 1998. Elle constitue une révision technique. Les principales modifications comprennent la mise à jour de la présente partie conformément à la CEI 61558-1:2005. 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.

Varnost močnostnih transformatorjev, dušilk, napajalnikov in kombinacij teh elementov - 2-8. del: Posebne zahteve za transformatorje za zvonce in gonge (IEC 61558-2-8:2010)

Ta del IEC 61558 obravnava varnost transformatorjev za zvonce in gonge, in napajalnikov, ki vsebujejo transformatorje za zvonce in gonge. Transformatorji, ki vsebujejo elektronska vezja, so prav tako zajeti v tem standardu. OPOMBA 1: Varnost vključuje električne, toplotne, in mehanske vidike. Razen če je drugače navedeno, v nadaljevanju, izraz transformator zajema  transformatorje za zvonce in gonge, ter napajalnike, ki vsebujejo transformatorje za zvonce in gonge. Ta del se uporablja za nepremične, enofazne, zračno hlajene (naravno ali vsiljeno), samostojne ali povezane transformatorje suhega tipa. Navitje je lahko inkapsulirano ali nekapsulirano. Ta standard velja za transformatorje in napajalnike (linearne). Ta standard, v kombinaciji z delom 2-16 za stikalni napajalnik (SMPS), se uporablja tudi za napajalnike z notranjimi obratovalnimi frekvencami višjimi kot 500 Hz. Če sta zahtevi v nasprotju, ima prednost najstrožja. Nazivna napetost napajanja ne presega 250 V enosmernega toka, in nazivna frekvenca napajanja ne presega 500 Hz. Ta standard se uporablja za transformatorje in linearne napajalnike z notranjimi obratovalnimi frekvencami, ki ne presegajo 500 Hz. Nazivni izhod ne sme presegati 100 VA. Izhodna napetost v prostem teku ne presega 33 V izmeničnega toka ali 46 V enosmernega toka brez nihanj in nazivna izhodna napetost ne presega 24 V izmeničnega toka ali 33 V enosmernega toka brez nihanj. Transformatorji za zvonce in gonge so v splošnem namenjeni za oskrbo opreme za zvočno signalizacijo za domačo rabo in drugih podobnih naprav, kjer pride do obremenitve za kratka časovna obdobja.

General Information

• Status: Published
• Publication Date: 05-Sep-2010
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: I96 - Imaginarni 96
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 18-Aug-2010
• Due Date: 23-Oct-2010
• Completion Date: 06-Sep-2010
• 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
• Ref Project: EN 61558-2-8:2010 - Safety of transformers, reactors, power supply units and combinations thereof - Part 2-8: Particular requirements and tests for transformers and power supply units for bells and chimes

Relations

• Replaces: SIST EN 61558-2-8:2000 - Safety of power transformers, power supply units and similar -- Part 2-8: Particular requirements for bell and chime transformers
• Effective Date: 01-Jul-2013
• Replaced By: SIST EN IEC 61558-2-8:2025 - Safety of transformers, reactors, power supply units and combinations thereof - Part 2-8: Particular requirements and tests for transformers and power supply units for bells and chimes
• Effective Date: 01-May-2025
• Revised: SIST EN 61558-2-8:2000 - Safety of power transformers, power supply units and similar -- Part 2-8: Particular requirements for bell and chime transformers
• Effective Date: 02-Jul-2013

Overview

EN 61558-2-8:2010 (IEC 61558-2-8:2010) specifies particular safety requirements and tests for transformers and power supply units used in bells and chimes, including transformers that incorporate electronic circuits. It is a Part 2 document in the EN/IEC 61558 series and is intended to be used together with EN/IEC 61558-1:2005 (general requirements and tests). This second edition (2010) replaces the 1998 edition and was prepared as a group safety publication in accordance with IEC Guide 104.

Key topics and requirements

EN 61558-2-8 supplements and modifies Part 1 by addressing bell/chime‑specific risks and tests. Key technical topics include:

• Ratings, classification and marking requirements for bell and chime transformers and power supply units.
• Output voltage and current specifications under load and no‑load conditions.
• Protection against electric shock, insulation, dielectric strength and leakage current limits.
• Short‑circuit, overload protection and short‑circuit voltage characteristics.
• Heating and thermal requirements, including temperature rise limits.
• Mechanical strength, construction and components requirements to ensure robust operation in doorbell and chime applications.
• Ingress protection, wiring, terminals and earthing provisions to guard against dust, moisture and misuse.
• Creepage/clearance distances, resistance to heat, fire and tracking, and corrosion resistance.
• Specific test procedures and criteria to verify compliance with the above items.

(These topics reflect the standard’s clause list and test focus; use the full standard for detailed test methods and numerical limits.)

Applications and users

EN 61558-2-8 is directly relevant for:

• Manufacturers and designers of doorbell transformers, electronic chime power supplies and combined bell/chime units.
• Product safety and compliance engineers ensuring conformity with European safety rules.
• Test laboratories and certification bodies performing type testing and approvals.
• Installers and specifiers selecting compliant transformers for residential and commercial entry systems, intercoms, church or building chime systems.

Practical applications include safety design and type‑testing of low‑voltage bell transformers, electronic chime modules and power supplies used in access control, notification systems and architectural chimes.

Related standards

• EN/IEC 61558-1:2005 - General requirements and tests (normative companion).
• Other parts of the EN 61558 series covering reactors, power supplies and special transformer types.
• IEC Guide 104 (group safety publications) and EU Low Voltage Directive references (for regulatory alignment).

Compliance with EN 61558-2-8:2010 helps manufacturers demonstrate safe design and testing for bell and chime transformers and power supplies, supporting market access and certification in Europe.

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2010
1DGRPHãþD
SIST EN 61558-2-8:2000
9DUQRVWPRþQRVWQLKWUDQVIRUPDWRUMHYGXãLONQDSDMDOQLNRYLQNRPELQDFLMWHK
HOHPHQWRYGHO3RVHEQH]DKWHYH]DWUDQVIRUPDWRUMH]D]YRQFHLQJRQJH,(&

Safety of transformers, reactors, power supply units and combinations thereof - Part 2-8:
Particular requirements and tests for transformers and power supply units for bells and
chimes (IEC 61558-2-8:2010)
Sicherheit von Transformatoren, Drosseln, Netzgeräten und entsprechende
Kombinationen - Teil 2-8: Besondere Anforderungen und Prüfungen an Transformatoren
und Netzgeräten für Klingeln und Läutewerke (IEC 61558-2-8:2010)
Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des
combinaisons de ces éléments - Partie 2-8: Règles particulières et essais pour les
transformateurs et blocs d'alimentation pour sonneries et carillons (CEI 61558-2-8:2010)
Ta slovenski standard je istoveten z: EN 61558-2-8:2010
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 61558-2-8
NORME EUROPÉENNE
August 2010
EUROPÄISCHE NORM
ICS 29.180 Supersedes EN 61558-2-8:1998

English version
Safety of transformers, reactors, power supply units
and combinations thereof -
Part 2-8: Particular requirements and tests for transformers and power
supply units for bells and chimes
(IEC 61558-2-8:2010)
Sécurité des transformateurs, bobines Sicherheit von Transformatoren, Drosseln,
d'inductance, blocs d'alimentation Netzgeräten und entsprechende
et des combinaisons de ces éléments - Kombinationen -
Partie 2-8: Règles particulières et essais Teil 2-8: Besondere Anforderungen
pour les transformateurs et blocs und Prüfungen an Transformatoren
d'alimentation pour sonneries et carillons und Netzgeräten für Klingeln
(CEI 61558-2-8:2010) und Läutewerke
(IEC 61558-2-8:2010)
This European Standard was approved by CENELEC on 2010-07-01. 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, Croatia, 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

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61558-2-8:2010 E
Foreword
The text of document 96/354/FDIS, future edition 2 of IEC 61558-2-8, 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 61558-2-8 on
2010-07-01.
This European Standard supersedes EN 61558-2-8:1998.
The main changes consist of updating this part in accordance with EN 61558-1:2005.
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.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
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) 2011-04-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2013-07-01
This part is intended to be used in conjunction with the latest edition of EN 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 EN 61558-1, so as to convert that
publication into the EN standard: Particular requirements and tests for transformers and power supply
units for bell and chime.
A list of all parts of the EN 61558 series, under the general title: Safety of transformers, reactors, power
supply units and combinations thereof, can be found on the CENELEC 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, notes, figures and tables additional to those in Part 1 are numbered starting from 101;
supplementary annexes are entitled AA, BB, etc.
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of
EC Directive 2006/95/EC.
Annex ZA has been added by CENELEC.

- 3 - EN 61558-2-8:2010
Endorsement notice
The text of the International Standard IEC 61558-2-8:2010 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 61558-2-16:2009 NOTE  Harmonized as EN 61558-2-8:2009 (not modified).
__________
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Annex ZA of Part 1 is applicable except as follows:

Addition:
Publication Year Title EN/HD Year

IEC 61558-1 2005 Safety of power transformers, power supplies, EN 61558-1 2005
reactors and similar products - + corr. August 2006
Part 1: General requirements and tests

IEC 61558-2-8 ®
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 2-8: Particular requirements and tests for transformers and power supply
units for bells and chimes
Sécurité des transformateurs, bobines d’inductance, blocs d’alimentation et des
combinaisons de ces éléments –
Partie 2-8: Règles particulières et essais pour les transformateurs et blocs
d’alimentation pour sonneries et carillons
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
N
CODE PRIX
ICS 29.180 ISBN 978-2-88912-036-9
– 2 – 61558-2-8 © 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.6
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.9
13 Short-circuit voltage.9
14 Heatingss .9
15 Short-circuit and overload protection .10
16 Mechanical strength.10
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 .12
22 Supply connection and other external flexible cables or cords.12
23 Terminals for external conductors .12
24 Provisions for protective earthing .12
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 .13
Annexes.14
Annex F Requirements for manually operated switches which are parts of transformer
assemblies.14
Bibliography .14

61558-2-8 © IEC:2010 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY OF TRANSFORMERS, REACTORS,
POWER SUPPLY UNITS AND COMBINATIONS THEREOF –

Part 2-8: Particular requirements and tests
for transformers and power supply units for bells and chimes

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International standard IEC 61558-2-8 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 1998. It constitutes a
technical revision. The main changes consist of updating this part in accordance with
IEC 61558-1:2005.
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 – 61558-2-8 © IEC:2010
The text of this standard is based on the following documents:
FDIS Report on voting
96/354/FDIS 96/361/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 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 tests for transformers and
power supply units for bell and chime.
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
...