Fire rated items are flame resistant / fire retardant and give some passive resistance but aren't intumescent and don't expand when heated. These should still be preferable for standard construction needs than standard items that have no ranking of any type. Up to 126 wireless addresses on only one loop, https://www.thesafetycentre.co.uk/blog/ems-wireless-firecell-systems-from-the-safety-centre/