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Copper bus bars for high voltage switchgear are normally nickel plated. Tin is horrible in high electric fields - it forms dendrites.

Tesla's busbars appear to be naked copper - not sure if there's a passivation spray on them.
 

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That and machining copper can be biotch.

I keep putting off getting copper for bus bars and it keeps going up in cost 🤬 $4.60/oz last I looked

Another reason to use these kinds of services is you only get what you need vs a sheet or 6ft length (or two) of it
 
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