In the 1960s copper prices were very high , so they started to manufacture aluminum wiring that was small enough to be used in homes . Prior to this time aluminum wiring was only used for utility companies for large overhead aluminum wires .When they first started using aluminum wiring in houses , it wasn’t really installed any different than the current copper wiring systems we have. The aluminum wiring is attached to the device via a small screw that wraps and turns in the direction that the wire has been curled for and secures the wire to the device. The metal screw on the device consists of a small metal plate behind a metal screw on the device . Both of these were made of brass. This caused a particular problem as the expansion rate of the two different metals are of course different . the aluminum connection started breaking down over time. The best solution is a replacement of the devices with a device that Is made for the aluminum wiring and has aluminum screws and an aluminum metal plate on the device . These have the same expansion and contraction rate as the aluminum wire . This coupled with Arc Fault protection for the circuits is the best solution for this problem . Also all connections and boxes should be made with approved aluminum connectors . This is a great , cost effective solution to aluminum wiring concerns .
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