"ornathon": The mad dash to the coffee pot. This situation is created by an electrical fire in your plant that will inevitably lead to loss of power. He who holds the last cup of coffee reigns supreme.
on the circuit tracers i have a little GB that we used along with a nice greenlee and we traced out all receptacles in our facility and it worked great our drafters and eng dept guys are going to make up some new prints for us maint guys and electricians.
Worked in an industrial facility for many years. Step 1: Do a GOOD search to see if there is any construction or repair work going on that COULD intersect with your runs. Might save lots of work. I have had some success tracing 'lost' conduits with an underground pipe tracer (like the ones the utility uses). They inject a strong signal onto the pipe (which you might have to isolate from the grounded panel) and depending on the amount of 'clutter' under the concrete you may be able to trace it quite aways or pick it up from the other end.