With the liberalization of telecommunications, many services are provided by several Operators on the same cable. Equipment owned by different Operators is installed in the same telecommunication facilities and in many cases are interconnected. Therefore, problems related to EMC, resistibility and safety can occur. This Recommendation describes necessary steps to ensure safe and problem-free operation in multiple Operator environments from EMC, resistibility and safety point of view. This Recommendation gives also guidance for determining responsibility of EMC problems under co-location telecommunication installations.