1. BS EN 62820-1-1 AMD AA. Building intercom systems. Part 1-1. System requirements. General (23rd April 2021) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (8 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
2. Building intercom systems. Requirements for advanced security building intercom systems (ASBIS) Part 2, (21st February 2018) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (36 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
3. BS EN IEC 62820-1-1. Building intercom systems. Part 1-1. System requirements. General (29th November 2021) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (43 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
4. Code of practice for the design, planning, installation, testing and maintenance of sound systems. (15th April 1997) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (124 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
5. Building intercom systems. System requirements. General Part 1-1, (7th July 2022) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (52 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗