The purpose of this Recommendation is to ensure safe and problem-free operation for connection to unbundled cable. This recommendation is applied when equipment or system is connected to unbundled cable. Minimum requirements are given in this document in order to ensure safe and problem-free operation and to reduce trouble related to EMC, Safety and Resistibility. Main aspects are Safety for human and equipment, Emission and Immunity, Resistibility of equipment against overvoltage and overcurrent and mutual interference.