BS EN 61558-1 : 2005

INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 General notes on tests
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
Annex A (normative) - Measurement of creepage distances and
                      clearances
Annex B (normative) - Testing a series of transformers
Annex C (normative) - Creepage distances (cr), clearances (cl)
                      and distances through insulation (dti)
                      Material group II (400 <= CTI < 600)
Annex D (normative) - Creepage distances (cr), clearances (cl)
                      and distances through insulation (dti)
                      Material group I (CTI >= 600)
Annex E (normative) - Glow-wire test
Annex F (normative) - Requirements for manually operated switches
                      which are parts of transformers assembly
Annex G (normative) - Tracking test
Annex H (normative) - Electronic circuits
Annex J (normative) - Measuring network for touch-currents
Annex K (normative) - Insulated winding wires for use as multiple
                      layer insulation
Annex L (normative) - Routine tests (production tests)
Annex M (informative) - Examples to be used as a guide for 19.1
Annex N (informative) - Examples of points of application of test
                        voltages
Annex P (informative) - Examples of points of measurement of creepage
                        distances and clearances
Annex Q (informative) - Explanation of IP numbers for degrees of
                        protection
Annex R (normative) - Explanations of the application of 4.1.1.2.1
                      of IEC 60664-1
Annex U (informative) - Optional t[w]-marking of transformers
Annex V (informative) - Symbols to be used for thermal cut-outs
Annex W (normative) - Coated printed circuit boards
Bibliography
Index of defined terms
Annex ZA (normative) - Normative references to international
                       publications with their corresponding
                       European publications

Defines the safety aspects of power transformers, power supplies reactors and similar products such as electrical, thermal and mechanical safety.