Fire Alarm Systems — Types of Fire Alarm Systems — System Design — Control of Indicating Panels — Detector Heads — Manual Call Points — Alarm Sounders — Power Units — Diversion Relays — Self Contained Fire Alarms — Wiring & Installation — Inspection & Servicing — Statutory Regulations
No British Standard exists specifically for this item and indicating panels. A diversion relay permits the audible signal until the system is reset.