my PL has an exemption clause for burglar/fire alarms, it puts something like a 300% loading on me if I want covered for them, I think its because Im not registered with any alarm bodies,
such as SSAIB/NACOSS etc as Andy points out.
EDIT, Im covered to fit them, but my insurance wont be liable if they fail, or something like that,
I simply explain to customers and they seem OK,