It is difficult and dangerous to combine aluminum and copper wiring. Are there any pitfalls with respect to tinned copper and copper?

  • Copper that has a silver looking coating.
    – Ed Beal
    Commented Nov 29, 2018 at 23:35

2 Answers 2


Tinned copper is fine to splice the same way as ordinary copper

Tinned copper (silvery on the outside, copper-colored on the inside, oft stranded) is fine to splice using copper-rated splices. This is not to be confused with aluminum (silvery all the way through) which requires special splicing (Alumiconns or AlxCu mechanical connectors), or copper-clad aluminum (copper-colored on the outside, silvery on the inside) which also is OK to use with copper-rated splices, but needs to be treated as aluminum with regards to wire gauge.


So you have 2 questions tinned copper and copper are fine to combine no problems there but copper and aluminum are a totally different type of connection requiring the use of special connectors. With aluminum and copper the junction will fail if not done properly causing a fire hazard. Tinned copper and copper a wire nut is fine. Look up aluminacon connectors for aluminum to copper connections.

  • I do not have 2 questions. I have a statement and a question. Commented Nov 30, 2018 at 8:49

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