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Unless they have changed it in the last 2-3 years its only recommended you do the course as proof of competency. For appliance testing I feel the course is definitely required its not a simple as pressing a button and looking at the result.

Can of smoke is about $20. Reading the instructions, about 5 mins time. Though I will mention that some smoke detectors are purely thermal(heat) activated. RCD testor ie this one $160 Since under Aust law you can test and tag appliances without an electrical licence I see no reason why you...

That just tests the sounder and battery. Does not actually test the smoke detection chamber. Yes they are supposed too. But many tenants just disconnect it instead when it starts beeping so I guess they are trying to reduce that. That said a new battery costs a couple bucks and you are already...