I was at an old friend's who was having some power supply issues. Receptacles on the layout with no grounding or any way to insure the hot and neutral connections were right. Open 120V wiring under the layout. I told him not to call me when his house burned down.
I will need 120V receptacles on a couple of peninsulas on my layout. That will all be in EMT and metal boxes.
No, I'm not an electrician, and I won't help you with this on your layout!