Fire rated items are flame resistant / fire retardant and present some passive resistance but aren't intumescent and do not expand when heated. These should still be preferable for standard design reasons than standard items that have no ranking of any type. FireCell is predicated on “Hub & Cluster” know-how https://www.thesafetycentre.co.uk/blog/ems-wireless-firecell-systems-from-the-safety-centre/