I realize that I can probably do the following safely without considering the Code, but I would really like to do it correctly and "per the electrical code".
I have three older ceiling smoke alarms in the house. They are wired together so that if one goes off, they all do. The run on 110 V.
They are not reliable and prone to false alarms, so I would like to replace them with modern units, but solely battery operated. No AC wiring.
The question is therefore how to handle the 110 V wiring that drops thru the ceiling plaster via a 2" hole, approx., to pick up the alarms. There is no metal box for them at the ceiling; only the hole with the AC wires dropping thru the plaster.
I can put a good quality wire-nut on each lead, and some tape, and just push the wiring back into the ceiling via the hole. Then the new smoke detector would cover up the hole. They are, of course, essentially all plastic units.
But, I keep thinking, that I must, per the Code, have them terminated in a metal box. Poking the 110 V leads, even though wire nuts on ends, back thru the hole would not be allowed. Is this true ?
They now run off of a branch circuit, with other stuff on it also, so just yanking the ckt breaker for it is not an option.
Don't want to enlarge the hole, or call in an Electrician to do it.
Any thoughts on how to handle this correctly, per Code, would be most appreciated.
Are there Very small metal boxes that I can perhaps put the unused wires in, and just push this (very small) box back thru the hole ? Or,... ?