Many years back I had one to blow out. Guess that was my classroom. Working in heavy industry you throw code out the door at times to get back running. There's some old repairs that we never got back to and are still good today. I wouldn't dare try that with 4160 but have several times on 480.
I've always been amazed at the spray paint insulation we use now on 4160. Course that's all in a dry J-box and I still don't trust the stuff completely and use the other wraps with it. But it works and with 4160 I use anything that helps keep that stuff in the insulation.
Few years back we upgraded to some mining cable running 1000 hp motors that moved in a aligator tract as the carriage made it's stroke. This cable had an extra layer if graphite inside and the guys on night shift didn't see it printed on that wrap. It was left in there right against the lugs. Started that big boy up and by the 4th stage of the start cycle it blew the door off that 4'x4' 2' deep junction box. Hinges and all. Some more of that true classroom work. LOL 4160 takes time to prep. We don't rush that work at all.