The Fatal Current Electrocution occurs when a small, specific amount of electrical current flows through the heart for 1 to 3 seconds. These muscles loose their vital rhythm and begin to fibrilate .
Death soon follows.
Toasters are not grounded. There is now a potential for electricity to flow between the chassis of the toaster and any grounded surface that it might become connected to. A copper wire is conductive. It can conduct electricity. The earth is conductive.