Oops.

So our internet-based business has a server closet. Fed by a circuit breaker. That's on the same panel as our test equipment power.

So when our techs plug in a 12VDC device to 240VAC, and melt the thing internally, and trip the 100A breaker feeding the service panel, the server closet looses power. Great fun, since I'm not the IT guy running around like a chicken with its head cut off.

Yes, we have a honkin' big battery back-up, but when nobody knows where the breaker is (even though it's already been thrown, twice, before) that makes for some genuine IT guy sightings.

Good times. Way to wire your building, maintenance! That electrician? Yeah, he doesn't work here anymore.