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Question:

DIY septum with a safety pin?

DIY septum with a safety pin?

Answer:

Yes there are: Because the hard wired smoke detectors are connected to 120 volts they fall under the NEC Wiring methods NEC Article 300. The specific location is 300.11 It gives all of the rules about not using the grid support wires as a method of sole support. You do have to add a support wire the same as a luminary. The best way to attach the old work boxes is to use a bracket called a T-bar they are made by Caddy and several other companies. You also have to make sure that the suspended ceiling is not being used as a return air path for a forced air system because the NFPA 72 states that the minimum distance from a return air to a smoke or CO2 detector is 3 feet. Hope this answers your question :)
It's a theoretical risk, but in real life *extremely* unlikely. None of the documented cases of occupational exposure in the 20 years to 2001 involved a blood splash to the eye.

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