SN EN 60742 : 1995

General plan of the Standard
Chapter 1: General requirements
1 Scope and object
2 Definitions
3 General requirement
4 General notes on tests
5 Rating
6 Classification
7 Marking
8 Protection against electric shock
9 Change of input voltage setting
10 Output voltage and output current under load
11 No-load output voltage
12 Short-circuit voltage
13 Heating
14 Short-circuit and overload protection
15 Mechanical strength
16 Protection against harmful ingress of water and
     moisture
17 Insulation resistance and electric strength
18 Construction
19 Components
20 Internal wiring
21 Supply connection and external flexible cables and
     cords
22 Terminals for external conductors
23 Provision for protective earthing
24 Screws and connections
25 Creepage distances, clearances and distances through
     insulation
26 Resistance to heat, abnormal heat, fire and tracking
27 Resistance to rusting
Appendix A
Appendix IA Production tests
Appendix IA Examples to be used as guide for sub-clause 8.6
Appendix IC Examples of points of application of test
            voltages
Appendix ID Measurement of creepage distances and
            clearances
Appendix IE Examples of points of measurement of creepage
            distances and clearances
Chapter II: Supplementary requirements for isolating
            transformers
Section one - Isolating transformers for general use,
shaver transformers and shaver supply units
2 Definitions
5 Rating
7 Marking
8 Protection against electric shock
11 No-load output voltage
13 Heating
14 Short-circuit and overload protection
15 Mechanical strength
18 Construction
19 Components
21 supply connection and external flexible cables and
     cords
22 Terminals for external conductors
23 Provision for earthing
Appendix II-I-A Requirements for special socket-outlets
for shaver supply units
Chapter III: Supplementary requirements for safety
isolating transformers
Section one - Safety isolating transformers for general
use
5 Rating
7 Marking
8 Protection against electric shock
11 No-load output voltage
21 Supply connection and external flexible cables and
     cords
Section two - Transformers for toys
2 Definitions
4 General notes on tests
5 Rating
7 Marking
8 Protection against electric shock
9 Change of input voltage setting
10 Output voltage and output current under load
11 No-load output voltage
12 Short-circuit voltage
14 Short-circuit and overload protection
15 Mechanical strength
18 Construction
19 Components
21 Supply connection and external flexible cables
     and cords
Section three - Bell transformers
2 Definitions
4 General notes on tests
5 Rating
6 Classification
7 Marking
8 Protection against electric shock
10 Output voltage and output current under load
11 No-load output voltage
13 Heating
14 Short-circuit and overload protection
15 Mechanical strength
18 Construction
19 Components
21 Supply connection and external flexible cables and
     cords
22 Terminals for external conductors
23 Provision for earthing
Appendix II-I-A Requirements for special socket-outlets
for shaver supply units
Chapter III: Supplementary requirements for safety
isolating transformers
Section one - Safety isolating transformers for general
use
5 Rating
7 Marking
8 Protection against electric shock
11 No-load output voltage
21 Supply connection and external flexible cables and
     cords
Section two - Transformers for toys
2 Definitions
4 General notes on tests
5 Rating
7 Marking
8 Protection against electric shock
9 Change of input voltage setting
10 Output voltage and output current under load
11 No-load output voltage
12 Short-circuit voltage
14 Short-circuit and overload protection
15 Mechanical strength
18 Construction
19 Components
21 Supply connection and external flexible cables and
     cords
Section three - Bell transformers
2 Definitions
4 General notes on tests
5 Rating
6 Classification
7 Marking
8 Protection against electric shock
10 Output voltage and output current under load
11 No-load output voltage
13 Heating
14 Short-circuit and overload protection
15 Mechanical strength
18 Construction
19 Components
21 Supply connection and external flexible cables and
     cords
22 Terminals for external conductors
24 Screws and connections
Section four - Transformers for class III handlamps
2 Definitions
5 Rating
7 Marking
8 Protection against electric shock
10 Output voltage and output current under load
11 No-load output voltage
18 Construction
21 Supply connection and external flexible cables and
     cords
Figures
Annex ZA (normative) Testing of a series of transformers
Annex ZB (normative) Other international publications
quoted in this standard with the references of the
relevant European publications
Annex ZC (normative) Special national conditions

Gives requirements for stationary or portable, single-phase or polyphase air-cooled isolating and safety isolating transformers.