Smoke alarms using scattered light, transmitted light or ionization
Performance standard for residential smoke alarms.
Overview
AS 3786 is the product standard for smoke alarms. It defines the testing and performance requirements that allow an alarm to be marketed as compliant. The NCC then dictates where alarms must be located, how they must be powered, and how they must be interconnected.
Key Requirements
- Photoelectric (scattered light) or ionization type — photoelectric is increasingly required by state amendments.
- Tested for sensitivity, fault indication, and battery life.
- Marked with the standard reference.
How it's used in the NCC
Called up by Part 9.5 of the Housing Provisions, which adds location, power supply and interconnection requirements.
Practical Notes
- NCC requires 240V mains-powered with battery backup in new builds — battery-only is not compliant.
- Some states (Queensland, NSW) mandate photoelectric only.
Where to obtain
The full text of AS 3786 is published by Standards Australia and must be purchased — typical price A$150–400 per part. Always work from the current edition referenced in the NCC, not an older one.