SN EN 61558-2-12 : 2001

1 Scope
2 Normative references
3 Definitions
4 General requirements
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 dielectric 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
Annexes

Provides all aspects of safety such as electrical, thermal and mechanical. Also applies to stationary or portable, single-phase or polyphase, air-cooled (natural or forced), associated or independent: constant voltage auto-transformers, constant voltage separating transformers, constant voltage isolating transformers and constant voltage safety isolating transformers.