There's a whole machine for threading conduit, it looks like a drill with an attachment but its purpose made, there's 110v and 36v ones, the 110v ones are about ÂŁ250.00 and the 36v ones are about ÂŁ700.....they have changeable heads and do from 10mm to 30mm or therabouts on the 36v ones and up to 40mm on the 110v ones..... a bit like the machines that you see pipefitters using to thread big pipes only a lot smaller....
I have never seen sparks using them, only plumbers working with small steel heating pipes before they get the loctite55 out but we could use them, it's just that we use the tap and dye sets and the old yellow bender/vice......
There are also plumbing crimp machines made by the same company that look similar and come in 110v and 24v versions... I think it's the manufacturers that do the Battery crimpers we use to do big SWA's with.....but I can't remember the name, it was German.....I can have a look around...