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I used to put a round dry line box behind Aico alarms, otherwise the wires were exposed from the sheathing, if you get my drift.The mounting plate is quite thin.
PS I would include an isolator switch in your installation.
I prefer to fit a dry lining box behind them where possible, round or square works equally well.
You don't need to do it, and it is possible to connect them without, but it's just nicer in my opinion.
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Does everybody use 1.5mm for their dedicated smoke detector circuits?
No, I would use 1mm for a 6A smoke detector circuit, same as I do for 6A lighting circuits.
I'm sure someone will be along to say that technically the minimum should be 1.5 as its not a lighting circuit, but I'm personally satisfied that the departure is no less safe.