Standard project of IEC 62820 “building intercom system” was first proposed by China (SAC/TC100 on Security Alarm Systems) in 2012, and IEC approved the project in June of the year. A working group: Building Intercom Working Group (WG13) thus was established in IEC/TC79, and finished its first standard: System requirements-general requirement in September 2016.
In the following years, the WG developed other 4 standards, i.e. system requirements-Digital building intercom system, high safety building intercom system requirements, General System Application Guide, and High Safety Building Intercom System Application Guide. The last standard was completed in February 2018, which means the completion of the projects.