EN 61558-2-26:2013

FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 General notes on test
6 Ratings
7 Classification
8 Marking and other information
9 Protection against electric shock
10 Change of input voltage setting
11 Output voltage and output current under load
12 No-load output voltage
13 Short-circuit voltage
14 Heating
15 Short circuit and overload protection
16 Mechanical strength
17 Protection against harmful ingress of dust,
   solid objects and moisture
18 Insulation resistance, dielectric strength and
   leakage current
19 Construction
20 Components
21 Internal wiring
22 Supply connection and other external flexible
   cables or cords
23 Terminals for external conductors
24 Provisions for protective earthing
25 Screws and connections
26 Creepage distances, clearances and distances
   through insulation
27 Resistance to heat, fire and tracking
28 Resistance to rusting
Annexes
Annex B (normative) - Testing a series of transformers
Annex L (normative) - Routine tests (production test)
Annex AA (informative) - Saving energy
Annex BB (informative) - Incorporated transformers
Bibliography
Annex ZA (normative) - Normative references to international
         Publications with their corresponding European
         publications

IEC 61558-2-26:2013 deals with the safety of transformers, power supply units and switch mode power supply units all for saving energy and other purposes in electrical installations by adjusting the output voltage and/or other electrical characteristics on the output circuits without interruption affected by the transformers, power supply unit and switch mode power supply unit. 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 them 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.