Tunnels, subways, parking lots (Distributed Fiber Optic Fire Alarm) Conveyor belts (Distributed Fiber Optic Temperature Alarm) Cable racks and transformers (Distributed Fiber Optic Temperature Alarm) Bus ducts, warehouse units (Distributed Fiber Optic Temperature Alarm) Tank areas, coal storage yards (Distributed Fiber Optic Temperature Alarm) Power generation plant areas (Distributed Fiber Optic Temperature Alarm) Power plants and nuclear power (Distributed Fiber Optic Temperature Alarm) Oil re