Defect type
High · 3–4/5
Non-Interconnected Smoke Alarms in Multi-Storey Dwellings
I tested each alarm on a two-storey Class 1a dwelling and found the units operating independently - pressing one did not trigger the others. I reference NCC 3.7.5.3 for interconnection on multi-storey dwellings, and in my view this arrangement leaves upper-floor occupants exposed to a fire originating on a different level while they sleep.
Causes
- Retrofit works only added alarms on one level without wiring a shared trigger loop
- Electrician omitted the interconnect conductor during hardwired installation
- Mixed battery and mains units installed that are not compatible for wireless interconnection
Symptoms to look for
- Testing one alarm does not cause alarms on other levels to sound
- Only a single alarm present on the upper floor with no signalling cable to lower units
- Brand or model mismatch between upstairs and downstairs alarms blocking wireless pairing
Remedies
- Engage a licensed electrician to hardwire an interconnect conductor between all alarms
- Replace units with a matched set of wireless interconnected photoelectric alarms
- Verify full interconnection by pressing test on each alarm and confirming all others sound
Critical
Get an inspector through this property.
Findings in this category skew high severity. If you are under contract, we can usually book inside the cooling-off window. Every inspection includes 12 months of free advice.
Same category