Passive fire safety building components are used to resist, retard and isolate flames and the affiliated smoke and fumes: they don't in them selves extinguish flames for this reason These are classed as 'passive safety'. Wireless fire alarms are a good selection for worksites which could require fire defense but https://www.thesafetycentre.co.uk/blog/ems-wireless-firecell-systems-from-the-safety-centre/