For rigid electrical connections,Tinned coated Copper Bus Barsoffer a very efficient solution. Resistivity in copper bars is very low, 25 in^2 bar 1 foot long is only 0.0000329 Ohms-roughly 8 Watts lost at 500 Amps.
Tin plating is an excellent solution practically speaking, because it protects the copper, has reasonably lowresistance (higher than silver or copper but lower than nickel)
Where to use Tinned coated Copper Bus Bars:
Where not to use Tinned coated Copper Bus Bars:
What is special with Tin Coating for copper bar?
Tin plating has two main technical advantages: