NFPA Journal reports several cases where the cause of deadly home fires is identified as electrical equipment. In one case, an overheating extension cord ignited clothing on a bedroom floor, leading to a fire which killed one occupant by asphyxiation and caused 60 000 US$ damage.
Two other deadly fires were also reported to have been caused by extension leads overheating and igniting either the extension cable itself or nearby combustible materials. A further deadly fire was identified to have been caused by electrical installations setting fire to wood within a wall.
NFPA Journal March-April 2017 “Firewatch” http://www.nfpa.org/news-and-research/publications/nfpa-journal/2017/march-april-2017/news-and-analysis/firewatch