Management doesn't understand the difference between telling them it's technically possible to do live maintenance and that it's a challenge like the rest of our technical feats. I feel for the guy and his survivors. I've seen the same pressures play out on my data centers, but thankfully we were able to arrange that type of work as semi-regular full DR test and the place I was working at simply didn't have the same uptime demands when push came to shove. From a safety angle, I can't help but think that moving over the DC voltage for datacenters might be a better option. Some of the big boys are already doing it as we're currently taking AC power, running it through or along side DC power backups, then up to AC for power supplies, then DC for the servers. There's an economy to it, but DC is just safer to work with. That said, there's always going to be an AC/DC bus that's dangerous to work on and live electrical work on it will always take appropriate design ($$) and proper training.