Power interlocks (was Re: [OT] Alphaserver Oops!)

There are some pieces of equipment that I know inside and out, and am fully competent to repair. That doesn't mean that I'd never make a mistake, just that it would be much less likely. I know which interlocks on those can be defeated without harming the equipment, or (more importantly), the service person. There are other pieces of equipment that I think I have some clue about, and could probably repair, but that I'm far from being an expert on. Those are the ones that I wouldn't go and defeat interlocks without researching them further. One of the participants in this disucssion seemed to advocate disabling all interlocks as standard practice. That's what I was reacting to. I don't do that even on the equipment on which I am expert.