BS EN 50491-3:2009

General requirements for home and building electronic systems (HBES) and building automation and control systems (BACS). Electrical safety requirements | Status: Superseded, Withdrawn

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 excessive current.