This standard 20/30430763 DC BS EN 50122-3. Railway applications. Fixed installations. Electrical safety, earthing and the return circuit is classified in these ICS categories:
- 29.120.50 Fuses and other overcurrent protection devices
- 29.280 Electric traction equipment
This document specifies requirements for the protective provisions relating to electrical safety in fixed in-stallations, when it is reasonably likely that hazardous voltages or currents will arise for people or equip-ment, as a result of the mutual interaction of AC and DC electric power supply traction systems. It also applies to all aspects of fixed installations that are necessary to ensure electrical safety during maintenance work within electric power supply traction systems. The mutual interaction can be of any of the following kinds: — parallel running of AC and DC electric traction power supply systems; — crossing of AC and DC electric traction power supply systems; — shared use of tracks, buildings or other structures; — system separation sections between AC and DC electric power supply traction systems. The scope is limited to basic frequency voltages and currents and their superposition. This document does not cover radiated interferences. This document applies to all new lines, extensions and to all major revisions to existing lines for the follow-ing electric power supply traction systems: a) railways; b) guided mass transport systems such as: 1) tramways, 2) elevated and underground railways, 3) mountain railways, 4) trolleybus systems, and 5) magnetically levitated systems, which use a contact line system; c) material transportation systems. The document does not apply to: d) electric traction power supply systems in underground mines; e) cranes, transportable platforms and similar transportation equipment on rails, temporary structures (e.g. exhibition structures) in so far as these are not supplied directly or via transformers from the contact line system and are not endangered by the traction power supply system for railways; f) suspended cable cars; g) funicular railways; h) procedures or rules for maintenance. The rules given in this document can also be applied to mutual interaction with non-electrified tracks, if haz-ardous voltages or currents can arise from AC or DC electric traction power supply systems.