SJT,
Yea, it's amazing how there's never time to label stuff as it's installed/pulled, but there's always time to trace it for troubleshooting when part of a building is dark (or a production line is down)...clearly, we work better under pressure!
As far as transfer switches, it's an easy time of it if the conductors for the grid power, the genny power, and the load are all in separate conduits. I label the outside of the pipe with SMUD (for Sacto muncipal utility district) or PGE (Pacific Gas & Electric, our local PoCos), GEN, & LOAD (or FEEDER 1, 2, etc.). I've thought of using "GRID" for the poco supply, but it seems too similar to GEN for my taste. Too easy to mix up under stress.
If two of these sets of conductors run in a single pipe or bus duct, then you have to label the conductors themselves. I've had little luck finding a good place to attach a label inside the transfer switch can.
Cliff
