This must have happened to others on the board, I'll just recount one to start the ball rolling.
A company I worked for, for over ten years had a near fatality. The guy was working on a circa 1960's MCC. A "Live Terminal" protective cover had been removed from a starter panel and not replaced. Through shear bad luck he touched one of the terminals to earth with a screwdriver. You can imagine the fireworks! The protection didn't see the fault so the fireworks continued. It didn't stop until he knocked the screwdriver out with a wooden chair. Only then did he go for first aid. Severe burns to his face, chest and hands, his eyes only survived due to his glasses.
While he was off work I got involved. I was asked for a quick solution that would satisfy the HSE.
First thing I did was look at the protection and the supply cabling to the individual starters. 1200A ACB feeding 2" x ¼" aluminium busbars with 6mm aluminium singles from the bars feeding each drive cubical.
To be honest I went ballistic! I've seen some crap in my time but this was the worst I've ever come across. Cheap and nasty didn't come in to it.
Quick idea, there were lots of spare cubicle's so use one for a small drive group MCCB supply along with upgrading the cubical supplies. Plant management went overboard with the idea, so much so it went straight forward as safety suggestion of the month.
Now involve the group "Senior Authorised Person", "you can't do that, it will set a precedent for all other MCC's in the company". Safety suggestion revoked! It would cost to much.
What price safety!
At the end of the day it was the crap design that saved the lad, it limited the fault current.
All I could do was reduce the ACB O/L to 750A and write a disclaimer (for myself) in the event of any further incident.