BS EN 50491-3:2009 PDF

1   Scope 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 e...