This is the problem that we face - sometimes it does it sometimes it doesnt, it all depends on where the machine is in its process and what it is doing at that time. With servers handling processes at the time that could be crutial to the business the implications are huge - talking £millions£ here and that is something that we want to avoid, remove the risk manage it and ensure that the impact remains minimal.
Also with other equipment you have the issues regarding power - a UPS handles a hell of a lot of power and to have that taking a fit well you really wouldnt want to be near it, radios phones and key fobs being generally about the person, means that you would be close proximity. Not a great place to be.

Rugged