When working with 10,000 VDC, we have setoff barriers (think roped off areas used in bank lines) to keep bodies away from live exposed devices under integration

When working with 10,000 VDC, we have setoff barriers (think roped off areas used in bank lines) to keep bodies away from live exposed devices under integration test. One time, someone was standing just outside the offset area, floor was also yellow-black taped, the test voltage meter started to rise rapidly and I yelled "CLEAR, HOT", that person took a half a step away and watched an explosive fireball go right past where he once stood. so, yeah. It wasn't my job but it remains a collective safety effort, whether you're a safety officer or not.