BS 7443:1991

Committees responsible
Foreword
1. Scope
2. Object
3. References to relevant international standards
3.1 IEC Publications
4. Explanation of terms
4.1 Electrical supervision
4.2 Area of coverage
4.3 Paging zone
4.4 Information
4.5 Audible information
4.6 Intelligible information
4.7 Danger and warning signals
4.8 Alarm
4.9 Warning
4.10 Danger
4.11 Emergency
5. General requirements
5.1 System requirements
5.2 Units
5.3 Marking and symbols for marking
5.4 Environmental conditions
5.5 Interference
5.6 Safety requirements
5.7 Electrical matching values
6. System requirements
6.1 General
6.2 Microphones
6.3 Overall system requirements
6.4 Power supply
6.5 Monitoring facilities
6.6 Automatic priority switch
7. Installation requirements
8. System operation
8.1 Instructions for operation
8.2 Records
8.3 Maintenance
Figures
1. Schematic representation of a sound system for
      emergency purposes
2. Microphone frequency response, tolerance field

Characteristics and methods of test for emergency broadcast sound systems for indoor or outdoor. Includes environmental conditions, marking symbols, installation and safety requirements, and an automatic system for checking correct functioning.