SN EN 61558-2-23 : 2000

Clause
1 Scope
2 Normative references
3 Definitions
5 General notes on tests
6 Ratings
7 Classification
8 Marking and other information
9 Protection against accessibility to hazardous
   live parts
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 and electric strength
19 Construction
20 Components
21 Internal wiring
22 Supply connection and other external flexible
   cables or cords
23 Terminals for external conductors
24 Provision for protective earthing
25 Screws and connections
26 Creepage distances, clearances and distances
   through insulation
27 Resistance to heat, abnormal heat, fire and
   tracking
28 Resistance to rusting
Annex C Creepage distances and clearances - Material
        group II
Annex D Creepage distances and clearances - Material
        group I
Annex L Routine tests (production tests)
Annex ZA (normative) Normative references to
         international publications with their
         corresponding European publications

Covers all aspects of safety like electrical, thermal and mechanical. It is applicable to dry-type transformers and also to such transformers incorporating electronic circuits.