Note: Never use the live SAC pattern for tests – it risks causing unnecessary evacuation. | Country | Standard | Signal type | |---------|----------|-------------| | Sweden | SS 031 421 | 1 Hz pulsed (SAC) | | USA | NFPA 72 | Temporal Code 3 (0.5s on, 0.5s off, 0.5s on, 1.0s off) | | UK | BS 5839-8 | Continuous tone + voice | | Germany | DIN 14675 | Alternating 1000/2000 Hz |