BS EN 61558-2-9:2011

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
   cable 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
Bibliography
Annex ZA (normative) - Normative references
         to international Publications with their
         corresponding European publications

Addresses the safety of transformers for class III handlamps for tungsten filament lamps and power supply units incorporating transformers for class III handlamps for tungsten filament lamps.

Replacement:

This part of IEC61558 deals with the safety of transformers for class III handlamps for tungsten filament lamps and power supply units incorporating transformers for class III handlamps for tungsten filament lamps. Transformers incorporating electronic circuits are also covered by this standard.

NOTE1 Safety includes electrical, thermal, mechanical and chemical aspects.

Unless otherwise specified, from here onward, the term transformer covers transformers for class III handlamps for tungsten filament lamps and power supply units incorporating transformers for class III handlamps for tungsten filament lamps.

This part is applicable to stationary or portable single-phase air-cooled (natural or forced) independent or associated dry-type transformers. The windings may be encapsulated or non-encapsulated.

This standard is applicable to transformers and power supply (linear) with internal operational frequencies not exceeding 500Hz.

This standard used in combination with Part2-16 for switch mode power supply (SMPS) units is also applicable to power supplies with internal operational frequencies higher than 500Hz. Where the two requirements are in conflict, the most severe take precedence.

The rated supply voltage does not exceed 1000V a.c., and the rated supply frequency and the internal operational frequencies do not exceed 500Hz.

Transformers for class III handlamps for tungsten filament lamps have the following additional characteristics:

• – the no-load output voltage and the rated output voltage do not exceed 50V a.c. or 120V ripple-free d.c.;

• – there is only a small difference between the no-load voltage and the rated output voltage.

The rated output does not exceed:

• – 10 kVA.

This part is not applicable to external circuits and their components intended to be connected to the input terminals and output terminals of the transformers.

Transformers covered by this part are used in applications where double or reinforced insulation between circuits is required by the installation rules or by the end product standard.

NOTE2 Attention is drawn to the following:

• – for transformers intended to be used in vehicles, on board ships, and aircraft, additional requirements (from other applicable standards, national rules, etc.) may be necessary;

• – measures to protect the enclosure and the components inside the enclosure against external influences such as fungus, vermin, termites, solar-radiation, and icing should also be considered;

• – the different conditions for transportation, storage, and operation of the transformers should also be considered;

• – additional requirements in accordance with other appropriate standards and national rules may be applicable to transformers intended for use in special environments.

NOTE3 Future technological development of transformers may necessitate a need to increase the upper limit of the frequencies, until then this part may be used as a guidance document.