Safety of power transformers, power supply units and similar -- Part 2-8: Particular requirements for bell and chime transformers

Applies to fixed, single-phase, air-cooled independant or associated safety isolating transformers. This part 2 supplements or modifies the corresponding clauses in EN 61558-1. It has the status of a group safety publication in accordance with IEC Guide 104.

Sicherheit von Transformatoren, Netzgeräten und dergleichen -- Teil 2-8: Besondere Anforderungen an Klingel- und Läutewerkstransformatoren

Sécurité des transformateurs, blocs d'alimentation et analogues -- Partie 2-8: Règles particulières pour les transformateurs pour sonneries

Est applicable aux transformateurs de sécurité installés à poste fixe, monophasés, à refroidissement par air. La présente partie 2 complète ou modifie les articles correspondants de la EN 61558-1. Elle a le statut de publication groupée de sécurité conformément au guide 104 de la CEI.

Safety of power transformers, power supply units and similar - Part 2-8: Particular requirements for transformers for switch mode power supplies

General Information

Status
Published
Publication Date
31-Aug-2000
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Sep-2000
Due Date
01-Sep-2000
Completion Date
01-Sep-2000

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SLOVENSKI STANDARD
SIST EN 61558-2-8:2000
01-september-2000
Safety of power transformers, power supply units and similar - Part 2-8: Particular
requirements for transformers for switch mode power supplies
Safety of power transformers, power supply units and similar -- Part 2-8: Particular
requirements for bell and chime transformers
Sicherheit von Transformatoren, Netzgeräten und dergleichen -- Teil 2-8: Besondere
Anforderungen an Klingel- und Läutewerkstransformatoren
Sécurité des transformateurs, blocs d'alimentation et analogues -- Partie 2-8: Règles
particulières pour les transformateurs pour sonneries
Ta slovenski standard je istoveten z: EN 61558-2-8:1998
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
SIST EN 61558-2-8:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61558-2-8:2000

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SIST EN 61558-2-8:2000

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SIST EN 61558-2-8:2000

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SIST EN 61558-2-8:2000
NORME
CEI
INTERNATIONALE
IEC
61558-2-8
INTERNATIONAL
Première édition
STANDARD
First edition
1998-08
PUBLICATION GROUPÉE DE SÉCURITÉ
GROUP SAFETY PUBLICATION
Sécurité des petits transformateurs,
blocs d’alimentation et analogues –
Partie 2-8:
Règles particulières pour les transformateurs
pour sonneries
Safety of small power transformers,
power supply units and similar –
Part 2-8:
Particular requirements for bell
and chime transformers
 IEC 1998 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
utilisée sous quelque forme que ce soit et par aucun any form or by any means, electronic or mechanical,
procédé, électronique ou mécanique, y compris la photo- including photocopying and microfilm, without permission in
copie et les microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http: //www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
PRICE CODE N
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue

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SIST EN 61558-2-8:2000
61558-2-8 © IEC:1998 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
––––––––
SAFETY OF SMALL POWER TRANSFORMERS, POWER SUPPLY UNITS
AND SIMILAR –
Part 2-8: Particular requirements for bell and
chime transformers
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 61558-2-8 has been prepared by technical committee 96: Small
power transformers, reactors and power supply units and special transformers, reactors and
power supply units: safety requirements.
It has the status of a group safety publication in accordance with IEC Guide 104: Guide for the
drafting of safety standards, and the role of Committees with safety pilot functions and safety
group functions (1984).
The text of this standard is based on the following documents:
FDIS Report on voting
96/111/FDIS 96/118/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 part 2 is to be used in conjunction with IEC 61558-1. It was established on the basis of the
first edition (1997) of that standard.

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SIST EN 61558-2-8:2000
61558-2-8 © IEC:1998 – 5 –
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 bell and chime
transformers.
When a particular 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.
This standard replaces section 3 of chapter III of IEC 60742.
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.

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SIST EN 61558-2-8:2000
61558-2-8 © IEC:1998 – 7 –
SAFETY OF SMALL POWER TRANSFORMERS, POWER SUPPLY UNITS
AND SIMILAR –
Part 2-8: Particular requirements for bell and
chime transformers
1 Scope
Replacement:
This international standard deals with all aspects of safety such as electrical, thermal and
mechanical.
This part 2-8 of IEC 61558 applies to fixed, single-phase, air-cooled (natural or forced),
indépendant or associated safety isolating transformers for bell and chimes, having a
rated supply voltage not exceeding 250 V a.c., a rated frequency not exceeding 500 Hz, a
rated output not exceeding 100 VA.
The no-load output voltage shall not exceed 33 V a.c. or 46 V ripple free d.c. and the rated
output voltage shall not exceed 24 V a.c. or 33 V ripple free d.c.
Bell and chime transformers are generally intended to supply domestic sound signalling
equipment and other similar devices where the load is applied for short periods of time.
NOTE 1 – A partial load may be applied for illumination purposes.
This standard applies to special safety isolating transformers (transformer for bell and
chime) which are used where double or reinforced insulation between circuits is required by
the installation rules or by the appliance specification.
This standard is applicable to dry-type transformers. The windings may be encapsulated or
non-encapsulated.
NOTE 2 – Attention is drawn to the fact that for transformers intended to be used in tropical countries special
requirements may be necessary.
This standard also applies to transformers incorporating electronic circuits. This standard does
not apply to external circuits and their components intended to be connected to the input and
output terminals or socket-outlets of the transformer.
2 Normative references
This clause of part 1 is applicable.

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SIST EN 61558-2-8:2000
61558-2-8 © IEC:1998 – 9 –
3 Definitions
This clause of part 1 is applicable except as follows:
Addition:
3.101  bell and chime transformer: A single-phase safety isolating transformer specifically
intended to supply domestic sound signalling equipment and other similar devices.
3.102  normal operation: Conditions under which the transformer is operated in normal use
(see clause 14).
4 General requirements
This clause of part 1 is applicable.
5 General notes on tests
This clause of part 1 is applicable.
6 Ratings
This clause of part 1 is applicable except as follows:
Addition:
6.101 The rated output voltage shall not exceed 24 V a.c. or 33 V ripple free d.c.
The preferred values of rated output voltage are:
– 8 V, 10 V, 12 V, 16 V, 24 V a.c.;
– 6 V, 12 V, 24 V d.c.
6.102 The rated output shall not exceed 100 VA.
The preferred values of are:
rated output
– 4 VA, 8 VA, 10 VA, 12 VA, 16 VA, 18 VA, 20 VA, 24 VA, 36 VA, 48 VA.
6.103 The rated frequency shall not exceed 500 Hz.
6.104 The rated supply voltage shall not exceed 250 V a.c.
Compliance with the requirements of 6.101, 6.102, 6.103 and 6.104 is checked by inspection of
the marking.

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SIST EN 61558-2-8:2000
61558-2-8 © IEC:1998 – 11 –
7 Classification
This clause of part 1 is applicable except as follows:
Replacement:
7.2  According to short-circuit protection or protection against abnormal use:
– inherently short-circuit proof transformers;
– non-inherently short-circuit proof transformers;
– fail-safe transformers.
Replacement:
According to their mobility:
7.4
– fixed transformers.
Replacement:
7.5 According to their time of operation:
– short-time operation;
– intermittent operation.
NOTE – A partial load for illumination may be applied continuously.
Addition:
7.101 According to the method of mounting:
– mounting in a distribution assembly;
– mounting in sound signalling devices (bells, chimes, buzzers, etc.);
– mounting on an outlet box or cabinet;
– flush mounted;
– surface mounted.
8 Marking and other information
This clause of part 1 is applicable except as follows:
Addition:
8.1 h) bell and chime transformers shall be marked with one of the graphical symbols shown
in 8.11:

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SIST EN 61558-2-8:2000
61558-2-8 © IEC:1998 – 13 –
8.11 Addition:
Number of symbol
Symbol Explanation
in IEC 60417-2
Fail-safe bell and chime transformer
F
Short-circuit proof bell and chime
5013
transformer (inherently or non-inherently)
9 Protection against accessibility to hazardous live parts
This clause of part 1 is applicable
...

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