EVS-EN 50491-3:2009

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.