DANSK DS/EN 50491-3 PDF

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.