Ragnarok wrote:Actually, copper pipe is very popular for high power electrics, because in addition to having a low resistance, you can run cooling water through the middle to stop it from overheating, allowing you to put even higher currents through it.
With a sufficently hefty water pump, I could force thousands of amps down a piddlingly narrow piece of copper pipe, yet still keep it cool to the touch.
It's fairly common to do so on induction heaters.
I've worked with and around electrical installations in the US for many years and have never seen copper pipe used electrically for anything other than a ground tap on a cold water pipe. I'm sure it has usage in more esoteric applications, just not out with the common folk.
5 - 10' copper rods are standard use for ground stakes but that isn't a pipe.
Again I ask, why not just use copper buss products that are designed for electrical usage? The telephone industry is awash with plate copper bussing that is used in switching rooms.