This part of BS 7273 gives recommendations for the design, installation, commissioning andmaintenance of electrical control arrangements for actuation of mechanisms that unlock, release oropen doors in the event of fire. It applies to all aspects of the interface between these mechanismsand a fire detection and fire alarm system, including interfaces that incorporate acoustic coupling andradio transmission. It does not recommend whether the above mechanisms should, or should not, beused in any given premises, or in any particular circumstances.Incorporates the following:BS 7273-4:2015