EN 61050:1992/A1:1995

FOREWORD
SECTION 1 - GENERAL REQUIREMENTS
1 General
   1.1 Scope
   1.2 Normative references
2 Definitions
3 General requirements
4 General notes on tests
5 Rating
6 Classification
7 Marking
SECTION 2 - SAFETY REQUIREMENTS
8 Electrical characteristics
9 Magnitude influence
10 Heating
11 Endurance
12 Degrees of protection
13 Voltage across series capacitors
14 Moisture resistance
15 Insulation resistance and electric strength
16 Construction
17 Connection of the conductors
18 Provision for earthing
19 Screws, current-carrying parts and connections
20 Creepage distances and clearances
21 Insulating materials
22 Resistance to corrosion
Annex A (normative) Information on wiring rules
Annex B (normative) Transformers with connecting leads
Annex C (normative) Guidance for conformity of production
         tests
Annex ZA (normative) Other international publications
         quoted in this standard with the references of the
         relevant European publications

Applies to built in and independent single phase transformers with separate input and output windings for use on a.c. supply up to 1,000 V to 50 Hz or 60 Hz, to stabilise and supply cold cathode tubular lamps (or assemblies of such lamps) having a no load rated output voltage over 1,000 V but not over 10,000 V and meant for electric advertising signs, lighting, light signals and similar purposes. Does not apply to auto transformers and electronic convertors. May serve as a guide for transformers with applications other than those specified in the scope, such as instance transformers for photographic lamps, as long as they are not the subject of a particular IEC standard and their characteristics remain within the framework of those specified in the scope.