Here's my related story.
Once while working for a control panel builder, I was asked to perform a test of the ground-fault trip (arcing, not personnel) on a 1200A main circuit breaker in an MCC. I pushed the "Test" button, duh.
A management type who came out to witness this test said "That doesn't prove anything, we don't know if it will trip on a ground fault, all that proves is that the trip coil works." After insisting to him that this does indeed simulate a ground fault by injecting current into the sensor, he INSISTED that the only valid test was to ground one side of the breaker and turn it on! I refused to be involved in the test, expressing my extreme concern for everyone's safety (this was in 1987 by the way). I left the shop under threat of dismissal, but before I could leave they had a flunky close the breaker with a wire connecting phase A to the ground bus. Wire vaporized, sprayed molten copper all over everyone (door was open too), burned a few people through their clothes, ruined the 1200A breaker etc. etc. etc. Needless to say I was not fired, but I got out of that madhouse as soon as I could.