The company I work for started a new contract building SCR controlled power supplies. They have a 480v input that's transformed down to 12.5/15/17.5 V. In testing we can push as much as 2800 A on the load side. To deal with the current we go so far as to build custom water cooled hoses with braided copper run through them. All I know about their application is that they heat ovens.
My question is why go through the trouble of building such complex power supplies with expensive water cooled conductors to heat an oven? Wouldn't high voltage with a resistive load achieve the same effect? My only guess so far is the safety on not working around high voltage.