This part gives recommendations for planning, installation, commissioning, operation and maintenance of Building Intercom Systems, for use in security applications. The different technical requirements for BIS are specified in the IEC 62820-1-1 and IEC 62820-1-2 parts. The objectives of this standard are to: a) provide a framework to assist system integrators, installers, consultant engineers and system owners in establishing their requirements; b) assist specifiers and system owners in determining the appropriate equipment required for a given application.