Hi all,

We have installed a number of motorized smoke dampers in lobbies which are fitted with BEN24 motorized actuators. We have used a non fire rated junction box to contain the wiring connections and this box is within the smoke shaft.

The damper and actuator assembly has arrived onsite with non fire rated cabling (O5Z1Z1-F) from the factory. The power supply cable to the damper from the wider system is with FP200 enhanced. I was told that using a non fire rated junction box is non compliant. In my view this is not true as the box is within the same compartment as the damper actuator and the actuator cables are themselves non fire rated. 

Something to note is that the smoke shaft is lined with a duct so all the cable will be exposed to is heat - well until the duct itself fails.