Here is a cnc table I built with plasma cutting option. I am using my PM256 Multi unit for the plasma power.
This table was built with no plans using things I seen others do for their tables. I ran grounds from the computer/control cabinet, table base, and PM 256, wiring using shielded cables and farrite cores. This seems to have protected against the EMI from the PM256's HF start. Still need to fine tune it but it cuts very well.