NEN EN 60950 : 94 AMD 4 2000

INTRODUCTION
0 Principles of safety
      0.1 General principles of safety
      0.2 Hazards
      0.3 Materials and components
1 General
      1.1 Scope
      1.2 Definitions
      1.3 General requirements
      1.4 General conditions for tests
      1.5 Components
      1.6 Power interface
      1.7 Markings and instructions
2 Protection from hazards
      2.1 Protection from electric shock and energy
             hazards
      2.2 SELV circuits
      2.3 TNV circuits
      2.4 Limited current circuits
      2.5 Limited power sources
      2.6 Provisions for earthing and bonding
      2.7 Overcurrent and earth fault protection in
             primary circuits
      2.8 Safety interlocks
      2.9 Electrical insulation
      2.10 Clearances, creepage distances and distances
             through insulation
3 Wiring, connections and supply
      3.1 General
      3.2 Connection to a.c. mains supplies
      3.3 Wiring terminals for connection of external
             conductors
      3.4 Disconnection from the a.c. mains supply
      3.5 Interconnection of equipment
4 Physical requirements
      4.1 Stability
      4.2 Mechanical strength
      4.3 Design and construction
      4.4 Protection against hazardous moving parts
      4.5 Thermal requirements
      4.6 Openings in enclosures
      4.7 Resistance to fire
5 Electrical requirements and simulated abnormal
      conditions
      5.1 Touch current and protective conductor current
      5.2 Electric strength
      5.3 Abnormal operating and fault conditions
6 Connection to telecommunication networks
      6.1 Protection of telecommunication network service
             personnel, and users of other equipment
             connected to the network, from hazards in the
             equipment
      6.2 Protection of equipment users from overvoltages
             on telecommunication networks
      6.3 Protection of the telecommunication wiring
             system from overheating
Annex A (normative) Tests for resistance to heat and fire
Annex B (normative) Motor tests under abnormal conditions
                    (see 4.7.2.2 and 5.3.2)
Annex C (normative) Transformers (see 1.5.4 and 5.3.3)
Annex D (normative) Measuring instruments for touch-current
                    tests (see 5.1.4)
Annex E (normative) Temperature rise of a winding (see 1.4.13
                    and 4.5.1)
Annex F (normative) Measurement of clearances and creepage
                    distances (see 2.10)
Annex G (normative) Alternative method for determining
                    minimum clearances
Annex H (normative) Ionizing radiation (see 4.3.13)
Annex J (normative) Table of electrochemical potentials (see
                    2.6.5.6)
Annex K (normative) Thermal controls (see 1.5.3 and 5.3.7)
Annex L (normative) Normal load conditions for some types of
                    electrical business equipment (see
                    1.2.2.1 and 4.5.1)
Annex M (normative) Criteria for telephone ringing signals
                    (see 2.3.1)
Annex N (normative) Impulse test generators (see 2.10.3.4,
                    6.2.2.1 and G.5)
Annex P (normative) Normative references
Annex Q (informative) Bibliography
Annex R (informative) Examples of requirements for quality
                      control programs
Annex S (informative) Procedure for impulse testing (see
                      6.2.2.3)
Annex T (informative) Guidance on protection against ingress
                      of water (see 1.1.2)
Annex U (normative) Insulated winding wires for use without
                    interleaved insulation (see 2.10.5.4)
Annex V (normative) AC power distribution systems (see 1.6.1)
Annex W (informative) Summation of touch currents
Annex X (informative) Maximum heating effect in transformer
                      tests (see C.1)
Annex ZA (normative) Normative references to international
                     publications with their relevant
                     European publications
Annex ZB (normative) Special national conditions
Annex ZC (informative) A-deviations
Index
Figures
Tables

Defines designers with an appreciation of the underlying principles of safety requirements needed to deal with various potential hazards.