CEI EN 61558-2-26 : 2014

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

Describes 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.