In a word (or three) I would say yes, without knowing what circuits specifically you are refering to.
In the simplest form the coincidence detection system is just a "specialised" FD&A system.
A couple of paragraphs from 5839-1 to mull over....
(Under Scope)
The term fire detection and alarm systems, in the context of this part of BS 5839, includes systems that
range from those comprising only one or two manual call points and sounders to complex networked
systems that incorporate a large number of automatic fire detectors, manual call points and sounders,
connected to numerous inter-communicating control and indicating panels.
The term also includes systems that are capable of providing signals to initiate the operation of other fire
protection systems and equipment (such as fire extinguishing systems, smoke control systems or automatic
door release equipment) or safety measures (such as shut down of air handling systems, closing of oil or gas
valves, or grounding of lifts). It does not apply to the other systems and equipment themselves, or the
ancillary circuits to interface with them. Recommendations for the planning, installation and servicing of
facilities for operation of certain fire protection systems by the systems addressed within this part
of BS 5839 are given in BS 7273.
9.2 Recommendations
The following recommendations are applicable in the case of systems intended to actuate other fire
protection systems or safety facilities (e.g. by triggering an automatic fire extinguishing system, closing fire
resisting doors, shutting down an air handling system or grounding lifts).
a) The system should comply with the recommendations of any applicable part of BS 7273.
b) If no part of BS 7273 is applicable, any special requirements for system design should be identified in
the purchase specification or design proposals.
6266 Appendix B - for a risk cat. D or E system, recommends a "dedicated smoke detection system interfaced with the main building system - see 5839-1 and Annexe A.
