Aluminum wiring

The solid aluminum wiring which once was a common wiring has been implicated in numerous house fires and is no longer permitted in new installations in most jurisdictions. The problematic wiring was not the braided type aluminum still used today but the solid aluminum wire.

This wire was installed mostly in the mid to late seventies. In Arizona we see it mostly is commercial type buildings such as apartments and condominiums however some builders did Incorporated it into there residential building projects.

The two main problems associated with the solid aluminum wiring was oxidation or corrosion of the wiring and loosening at the connectors due to expansion and contraction of the wiring. In both cases the wire would loosen at the connections and cause heat until the device failed resulting in fire.

If a home has solid aluminum wiring it does not necessarily mean complete replacement. There are several approved repairs as the problem with the wiring is the connection not the conductivity. If the inspector locates any solid aluminum it with be identified and listed for review by a electrical contractor for any needed repairs.

The braided type aluminum wiring is used in most service connections and on many 240 volt appliances such as ranges and AC units. As a precaution an anti oxidiser must applied to the connections and this will be noted by your inspector if any repairs are needed.

If you have any questions on wiring or devices in the home review it with the inspector at the time of inspection.