Public Address System
Functional brief and Specifications of Public Address system
Objective:
The Public Address (PA) System is designed to deliver clear and targeted communication within specific zones or areas of a building, particularly during emergencies. Speakers are strategically positioned to ensure effective communication throughout the facility.
System Components:
- Speakers with Beacon: Equipped with visual and audible alert features.
- Voice Announcement Speakers: Designed for clear and intelligible voice communication.
Master Control:
- Direct Announcements: Allows operators to make real-time announcements.
- Automatic Messages: Enables pre-recorded messages to be broadcasted to selected locations, floors, or areas as needed.
Voice Alarm:
- Fire Alarm Activation: Upon detecting a fire, the system automatically broadcasts a message indicating the fire’s location, facilitating a swift response from occupants and rescue teams.
Audio Specifications:
- Output Level: Speakers must produce audio levels between 65 dB and 100 dB.
- Clarity: Must ensure clear and understandable announcements.
Fault Monitoring and Supervision:
- Speaker Monitoring: Each speaker unit is electrically supervised to detect faults such as open or short circuits.
- Cable Requirements: Use fire-resistant cables with supervised cores for reliability.
Connectivity Monitoring:
- Control Panel Monitoring: The control panel continuously checks the connectivity of each speaker unit.
- Alert System: Provides audio-visual warnings if any speaker unit encounters defects or connectivity issues.
Power Backup:
- Secondary Battery: The system includes a backup battery to ensure uninterrupted operation during power outages.
Note:
- The assembly point speaker must be weather proof to withstand diverse environmental conditions. A horn-type speaker is recommended, with a minimum power rating of 12 watts and an audio output ranging from 90 to 100 dB. In car parking areas, ensure adequate coverage for effective communication throughout the space.
- The PA system should be capable of driving all connected speakers simultaneously at full load, with an additional 20% capacity reserved for future expansion.
- The power backup must provide a minimum of 30 minutes of operation at full load to ensure uninterrupted performance.
What are the locations Public Address speaker unit shall be installed ?
- Each floor level
- Each notification zone
- Elevator lobbies
- Area(s) of refuge
- Each floor level inside an enclosed exit stair (s)
- Assembly point