<P> The disadvantages of aluminum wiring lie in its mechanical and chemical properties . It readily forms an insulating oxide, making connections heat up . Its larger coefficient of thermal expansion than the brass materials used for connectors causes connections to loosen . Aluminum can also "creep", slowly deforming under load, which also loosens connections . These effects can be mitigated with suitably designed connectors and extra care in installation, but they have made aluminum building wiring unpopular past the service drop . </P> <P> Organic compounds such as octane, which has 8 carbon atoms and 18 hydrogen atoms, cannot conduct electricity . Oils are hydrocarbons, since carbon has the property of tetracovalency and forms covalent bonds with other elements such as hydrogen, since it does not lose or gain electrons, thus does not form ions . Covalent bonds are simply the sharing of electrons . Hence, there is no separation of ions when electricity is passed through it . So the liquid (oil or any organic compound) cannot conduct electricity . </P> <P> While pure water is not an electrical conductor, even a small portion of ionic impurities, such as salt, can rapidly transform it into a conductor . </P> <P> Wires are measured by their cross sectional area . In many countries, the size is expressed in square millimetres . In North America, conductors are measured by American wire gauge for smaller ones, and circular mils for larger ones . The size of a wire contributes to its ampacity . The American wire gauge article contains a table showing allowable ampacities for a variety of copper wire sizes . </P>

A non metallic element which is a conductor of electricity
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