Popular nationwide emergency electrician - Service Technician Blogs - Another issue is that when aluminum rusts, it is not as conductive as copper. However with aluminum wiring, rust in wiring will impede the flow of electricity and can cause a number of other issues. Product Guide & List Prices on products, parts and accessories for rewiring a house, install ceiling fans, fuse panels, light, switches and outlets. This constant flux in size will result in the wires loosening themselves and connections become loose. Copper that rusts can remain conductive and continue its flow of power. This means that it is vulnerable to being broken, cut, and damaged which can leave live electrical wires exposed. Aluminum also expands and contracts when it becomes hot. For all of the above listed reasons, aluminum is prone to overheating and electrical fires. Aluminum wiring is much softer than standard copper wiring. Despite the reduced cost and increased conductivity, aluminum wiring has many potential issues ..More