$600k Fine Over Data Center Death (datacenterdynamics.com)
judgecorp writes: UK contractors Balfour Beatty and Norland have been fined £380,000 ($580k) after an electrician was electrocuted while working on a data center owned by finance firm Morgan Stanley. The fine follows mounting concern that safety is being compromised because of the need for data centers to remain online non-stop. This leads to pressure for contractors to work on live power supplies.
This is why (at least in the US), standard (and required) practice is to place a lock on the source of energy, and retain the only key to said lock. If multiple workers are all working on the same circuit, each worker has his (or her) own lock on the circuit.
It's called lockout/tagout, and there are SEVERE fines for removing somebody else's lock (and if somebody gets killed, due to your removing his lock, that would be considered manslaughter)