This standard specifies requirements for the protective provisions relating to electrical safety in fixed installations associated with a.c.- and d.c.-traction systems and to any installations that may be endangered by the traction power supply system. It also applies to all fixed installations that are necessary to ensure electrical safety during maintenance work within electric traction systems.
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BS EN 50122-1:1998 applies to all new lines and to all major revisions to existing lines for the following electric traction systems:
- railways
- guided mass transport systems such as tramways, elevated and underground railways, mountain railways, trolleybus systems and magnetic levitated systems
- material transportation systems.