This Recommendation deals with the management of electromagnetic (e.m.) interference produced by electric power systems and electrified traction systems on telecommunication systems. This Recommendation defines the procedure to evaluate the acceptability of an e.m. interference and gives: - the criteria defining the interference situations to be examined; - the interference management voltages to be applied; - the installation conditions of electric power, electrified traction and telecommunication systems under which the management voltages are applicable. This Recommendation establishes an official agreement between telecommunication operators and power and railway operators in order to clearly share responsibilities, and, as a consequence, if necessary, the relevant expenses for mitigation measures.