Safety of transformers, reactors, power supply units and combinations thereof - Part 2-6: Particular requirements and tests for safety isolating transformers and power supply units incorporating safety isolating transformers for general applications

IEC 61558-2-6:2021 is available as IEC 61558-2-6:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 61558-2-6:2021 deals with the safety of safety isolating transformers for general applications and power supply units incorporating safety isolating transformers for general applications. Transformers incorporating electronic circuits are also covered by this document. This third edition cancels and replaces the second edition published in 2009. This edition constitutes a technical revision.
- adjustment of structure and references in accordance with IEC 61558-1:2017;
- description of constructions moved in IEC 61558-1:2017;
- new symbol for power supply unit with linearly regulated output voltage.
It has the status of a group safety publication in accordance with IEC Guide 104.
This International Standard is to be used in conjunction with IEC 61558-1:2017.

General Information

Status
Published
Publication Date
17-May-2021
Current Stage
PPUB - Publication issued
Completion Date
18-May-2021
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IEC 61558-2-6:2021 - Safety of transformers, reactors, power supply units and combinations thereof - Part 2-6: Particular requirements and tests for safety isolating transformers and power supply units incorporating safety isolating transformers for general applications
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IEC 61558-2-6
Edition 3.0 2021-05
INTERNATIONAL
STANDARD
GROUP SAFETY PUBLICATION
Safety of transformers, reactors, power supply units and combinations thereof –

Part 2-6: Particular requirements and tests for safety isolating transformers and

power supply units incorporating safety isolating transformers for general
applications
IEC 61558-2-6:2021-05(en)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
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All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

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---------------------- Page: 2 ----------------------
IEC 61558-2-6
Edition 3.0 2021-05
INTERNATIONAL
STANDARD
GROUP SAFETY PUBLICATION
Safety of transformers, reactors, power supply units and combinations thereof –

Part 2-6: Particular requirements and tests for safety isolating transformers and

power supply units incorporating safety isolating transformers for general
applications
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.180 ISBN 978-2-8322-9791-9

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 61558-2-6:2021 © IEC 2021
CONTENTS

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

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 8

3 Terms and definitions ...................................................................................................... 8

4 General requirements ...................................................................................................... 8

5 General notes on tests .................................................................................................... 8

6 Ratings ............................................................................................................................ 8

7 Classification ................................................................................................................... 9

8 Marking and other information ......................................................................................... 9

9 Protection against electric shock ................................................................................... 10

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

11 Output voltage and output current under load ................................................................ 10

12 No-load output voltage .................................................................................................. 10

13 Short-circuit voltage ....................................................................................................... 11

14 Heating .......................................................................................................................... 11

15 Short-circuit and overload protection ............................................................................. 12

16 Mechanical strength ...................................................................................................... 12

17 Protection against harmful ingress of dust, solid objects and moisture ........................... 12

18 Insulation resistance, dielectric strength and leakage current ........................................ 12

19 Construction .................................................................................................................. 12

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

21 Internal wiring ................................................................................................................ 12

22 Supply connection and other external flexible cable or cords ......................................... 12

23 Terminals for external conductors .................................................................................. 12

24 Provisions for protective earthing................................................................................... 12

25 Screws and connections ................................................................................................ 12

26 Creepage distances, clearances and distances through insulation ................................. 12

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

28 Resistance to rusting ..................................................................................................... 13

Annexes ............................................................................................................................... 14

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

Table 101 – Symbols indicating the kind of transformer ........................................................ 10

Table 102 – Output voltage ratio ........................................................................................... 11

---------------------- Page: 4 ----------------------
IEC 61558-2-6:2021 © IEC 2021 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY OF TRANSFORMERS, REACTORS, POWER SUPPLY
UNITS AND COMBINATIONS THEREOF –
Part 2-6: Particular requirements and tests for safety isolating
transformers and power supply units incorporating safety
isolating transformers for general applications
FOREWORD

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rights. IEC shall not be held responsible for identifying any or all such patent rights.

International standard IEC 61558-2-6 has been prepared by IEC technical committee 96:

Transformers, reactors, power supply units and combinations thereof.

This third edition cancels and replaces the second edition published in 2009. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) adjustment of structure and references in accordance with IEC 61558-1:2017;
b) description of constructions moved in IEC 61558-1:2017;
c) new symbol for power supply unit with linearly regulated output voltage.
---------------------- Page: 5 ----------------------
– 4 – IEC 61558-2-6:2021 © IEC 2021
The text of this International Standard is based on the following documents:
FDIS Report on voting
96/506/FDIS 96/512/RVD

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.

It has the status of a group safety publication in accordance with IEC Guide 104.

This International Standard is to be used in conjunction with IEC 61558-1:2017.
NOTE When “Part 1” is mentioned in this standard, it refers to IEC 61558-1:2017.

This document supplements or modifies the corresponding clauses in IEC 61558-1:2017, so as

to convert that publication into the IEC standard: Particular requirements and tests for safety

isolating transformers and powe
...

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