This European Standard provides the electrical safety requirements for all devices connected to HBES/BACS. This European Standard is applicable to - operator stations and other human system interface devices, - devices for management functions, - control devices, automation stations and application specific controllers, - field devices, - cabling and interconnection of devices. This European Standard covers the following requirements and compliance criteria: - protection from hazards in the device; - protection from overvoltages on the network; - protection from touch current; - protection from hazards caused by different type of circuits; - protection of the communication wiring from overheating caused by excessive current.