I have learned a lot from this board, thank you all very much for sharing your knowledge.
I am upgrading my garage by adding a subpanel. I am running 6/3 Romex (the wire will never go in ground or outside the structure so Romex should be fine) from the main panel on a 50 AMP 2-pole breaker. I believe 6/3 Romex is rated up to 55 Amps, and while I think you can round-up to the next available breaker (60 amp), I don’t think I will need it. I am only planning to run lights, a 240-volt air compressor, a bunch of 120-volt tools. That’s about it. No major appliances that would ever go over 40-amp even. I am using a 125-amp rated panel with NO main-breaker in the panel.
I would like to add a disconnect to the garage itself so I can shut the power off to the garage easily without having to walk over to the main house panel and shut off the 50-amp breaker. I was planning on buying this:
Here is my question:
The switch has 3 poles. One for each hot, and one for the neutral. Since I am running Romex with 3 wires plus the bare ground, what do I do with the ground (bare copper)? Do I add a grounding bus bar into the switch panel? If so, do I bond the grounding bus bar to the panel? Then when I continue from the disconnect switch to the sub-panel itself do I just run the ground off that grounding bus bar to the sub-panel?
Thank you all in advance for the help and suggestions.