This International standard applies to the insulating synthetic ropes used in overhead contact lines. This International standard specifies the requirements of insulating synthetic rope assemblies and is applicable to electric traction overhead contact lines for railways, light railways, tramways, trolleybuses and other systems. These insulating synthetic ropes are utilised to provide mechanical support and electrical insulation for overhead contact lines. They are generally used in the following application fields: – delta suspension of contact wires; – catenary cable; – mid-point anchors; – tie; – dropper; – headspan; – noise and vibration damper; – bridle- and pulley suspensions; – cantilevers made of glass reinforced polymer (GRP). This standard establishes requirements and characteristics of the rope, test methods and checking procedures to be used with the insulating synthetic ropes, together with the ordering and delivery requirements. The synthetic ropes only for mechanical applications are not part of this international standard. Anyway the mechanical requirements and tests stated in this standard can be used for this kind of ropes. The object of this standard is to stipulate provisions for the design and to allow provision of the service indicated by the supplier to the purchaser or informed buyer.