Firefighters were called to Penpol Avenue, Hayle in the early hours of this morning after an arson attack.
One fire appliance from Camborne Community Fire Station attended a report of flames seen outside. The fire crew used one hosereel to extinguish a roll of copper wire that had been set alight.
Devon and Cornwall Police have been informed.
A police spokesman said: "Arson puts both the public and firefighters at unnecessary risk. It ties up resources that could be in demand for other more serious incidents. A lot of Cornwall is covered by on-call firefighters so there is also a significant cost to each incident."
Anyone with information on fires being deliberately started are advised to anonymously call Crimestoppers free on 0800 555 111 or contact Devon and Cornwall Police on 101.