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IEC 62128-2:2013 specifies requirements for protective provisions against the effects of stray currents, which result from the operation of d.c. traction systems. This standard applies to all metallic fixed installations which form part of the traction system, and also to any other metallic components located in any position in the earth, which can carry stray currents resulting from the operation of the railway system. This standard applies to all new d.c. lines and to all major revisions to existing d.c. lines. The main technical changes with regard to the previous edition are the restructuring of all clauses.