I have a standard 110 VAC rocker switch and and GFI outlet mounted in a standard electrical box which is flush mounted on my LH control panel. The entire layout is protected by the GFI. The rocker switch shuts the entire layout down except the outlet. I use the 110 VAC for tools, battery charging, etc. The rocker switch feeds a gang of 10 duplex outlets mounted under the table. I plug the transformers/power supplies into the these outlets. The rocker switch also feeds under layout lighting. The under layout lighting is standard porcelain light fixtures. A switch is provided to just turn off the under layout lighting.
When I shutdown the layout, I shutdown all remotes, move all transformer handles to zero voltage, turn off master layout AC and DC power and finally turn off the rocker switch. When I turn ON the layout there is no power to the tracks, accessories or layout lighting. Turning on the rocker switch does power the transformers/power supplies which in turn powers the turnouts and provides power to to the control panels.