I.S. EN 50163:2004

National Foreword
1 Scope
2 Normative references
3 Definitions
4 Voltages and frequencies of traction systems
5 Testing
6 Test methodology
Annex A (normative) - Maximum value of the voltage U
        according to the duration
Annex B (normative) - Special national conditions
Annex C (informative) - Changes, interruptions and
        distortion of voltages
Bibliography
Annex ZZ (informative) - Coverage of Essential Requirements
         of EC Directives

Specifies the main characteristics of the supply voltages of traction systems, such as traction fixed installations, including auxiliary devices fed by the contact line, and rolling stock, for use in the following applications: - railways; - guided mass transport systems such as tramways, elevated and underground railways mountain railways, and trolleybus systems; - material transportation systems.