Fuse; "Northmet" metal fuse wire holder, produced by the North Metropolitan Electric Power Supply Co, circa 1930

The North Metropolitan (North Met) Electric Power Supply Company was established in 1900 to supply electricity to a wide area of north London and Middlesex. This tin sign advertises the supply and proper use of the fuse wire produced by the company, which provided two different grades of wire on different spools, one labelled 'Power' and the second 'Light'. Closely linked to the North Metropolitan Tramways Company, NorthMet made a handsome profit selling surplus electricity from its power stations at Willesden and Brimsdown in Enfield. NorthMet had its own electricity showrooms where the public could pay their bills as well as buy electrical appliances. Some showrooms even gave cookery demonstrations.