DIN EN 50122-3:2011-09

This European Standard specifies requirements for the protective provisions relating to electrical safety in fixed installations when it is reasonably likely that hazardous voltages or currents will arise for people or equipment as a result of the mutual interaction of a.c. and d.c. electric traction systems. It also applies to all aspects of fixed installations that are necessary to ensure electrical safety during maintenance work within electric traction systems. The mutual interaction can be of any of the following kinds: parallel running of a.c. and d.c. electric traction systems, crossing of a.c. and d.c. electric traction systems, shared use of tracks, buildings or other structures, and system separation sections between a.c. and d.c. electric traction systems. This European Standard applies to all new lines, extensions 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 magnetically levitated systems, as well as material transportation systems. The responsible Committee is AK 351.2.1 "Sicherheit, Erdung, Schutz, Streuströme" ("Safety, earthing, protection, stray currents") at Subcommittee UK 351.2 "Ortsfeste Anlagen" ("Fixed installations") of the DKE (German Commission for Electrical, Electronic and Information Technologies) at DIN and VDE.