Aluminum Wiring is commonly safe, although there are concerns when incorrect receptacles or conductors are installed, the threat of a hazard may occur. What often makes aluminum wiring a hazard is aluminum wiring is a metal that is less strong than copper wiring and when the electricity goes through the aluminum wire it gets very hot then heats up. If an incorrect device or wire is attached to the aluminum wire, it causes the wire to oxidize, then creates a gap, then the connection may become loose and cause a fire hazard.