Copper and Aluminum cable joint is normal practice nowadays especially when there is a huge difference of prices in both conductor as copper cable being very expensive as compared to aluminum cable. Therefore it is now very common to use aluminum cable with copper thimble or copper lug. When we join the two conductors with each other without proper care, the joint will suffer with sever oxidation and as a result it will cause fire and lessening of joint. This video discusses the side effects of copper and aluminum joint

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