Quote:
Originally Posted by DawidvC
Steel has a higher electrical resistance than brass. This means you will have to go with bigger bolts than what you would use with brass bolts.
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Steel has a much higher resistance than copper. Some alloys are only 3% as conductive. There is no way to make up that conductivity difference, no matter how large the hardware.
Brass is %25-%30 as conductive as copper, which makes it at least workable. (The low thermal and electrical conductivity is a surprise to many, since most brass is 50-90% copper.) If you don't need corrosion resistance, you get far better performance by using pure copper and relying on other materials for strength.
Remember that you can't just increase the cross section to keep the same conductivity. It's a 3D flow problem. If the conductivity is too low, there just isn't enough contact patch area available to make up for it.