I have a client who is installing some machinery in the middle of his shop. 20' ceilings/steel structure. We're looking at a 3-phase 20A twist lock. I know I've seen SJO type cord in big box stores with strain relief that looks like fingercuffs for pulling big wire in pipe. I've never had to do anything like this before, so I thought I'd put it out there and see what you guys would recommend. Rigid drop?? I'll be piping over to the location overhead and trying to drop down. I hope that explains it well enough.