Lakes_Puma

Really sorry forgive my ignorance, but what do I need a junction box for, I thought I would just run 3 runs of alarm wire through the wall to the alarm panel and wire them into the two free zones and in parallel with the external sounder for the sound bomb?

Thanks Jaguar that's exactly the information I needed. It is a normal up and over metal door, can you post a link to the correct type of door contact?

I have an Accenta G3 alarm with two unused zones and would like to extend the alarm into my garage with is inbuilt. There is a single wall (thermal block) between the garage and the location of the alarm panel. I would like to fit a door sensor and a PIR and also fit a very loud sounder in the garage. I have some basic door contact switches and have been looking at one of the 4 way 'sound bomb' sounders. Would these be suitable? what PIR type would I need there are no appliances in the garage. Also is there a cage available for the sounder as I wouldn't want someone to be able to just whack it with a broom handle to silence it? Any help appreciated.