Describes different types of system using both wired and wireless transmission and specifies basic electrical requirements plus the minimum requirements for auxiliary equipment used with the systems.Cross References:BS 415BS 800BS 2011BS 4727:Part 3:Group 08BS 5817:Part 3BS 5817:Part 4BS 6217BS 6288BS 6840:Part 3BS 6840:Part 4BS 6840:Part 11BS 6840:Part 12BS 6840:Part 15IEC 27IEC 268-7ISO 2603ISO 4043CISPR 11