Were the hard wired interconnect alarms installed for conformance with the OBC? In other words, if the building is in compliance with the OBC then 9.5 does not apply, so maintenance requirements apply. This may not be a OFC issue, sounds like it requires a building permit application?
If it is a retrofit application I think the alarms have to be on an electrical circuit with no disconnect switch etc..
Let us know how it works out.