Spring-loaded contacts have mainly alleviated this issue with aluminium conductors in creating wire, but some creating codes continue to forbid using aluminium. Enamelled copper wire (copyright) has an enamel coating applied to it that makes it extra proof against corrosion. Some different types of coated copper which include enamelled wire https://bookmark-nation.com/story18022369/detailed-notes-on-crack-stitching-bars