This invention provides for an electrical device comprising a housing containing at least one electrical component and an automatic fire prevention or extinguishing system comprising at least one heat and/or smoke sensor, wherein the at least one heat and/or smoke sensor is operably connected to a container holding a fire-retarding, fire- extinguishing or fire-prevention material and wherein the container is arranged to dispense the fire-retarding, fire-extinguishing or fire-prevention material into the housing and/or onto the electrical component when the at least one heat and/or smoke sensor detects heat and/or smoke inside the housing, wherein the fire-retarding, fire- extinguishing or fire-prevention material is dispensed through at least one conduit operably connected to the container holding the fire-retarding, fire-extinguishing or fire-prevention material, and wherein the or each conduit is arranged to track electrical wiring of the electrical device or track at least part of an outer surface of at least one electrical component of the device.