Relationship between machine & table & plasma unit ground?

[jgramlich]

What is the proper relationship between the grounding of a CNC machine, the work table and the plasma power supply itself?

I'm putting together a CNC plasma machine, and have worked on others in the past. The plasma tables that I've seen before have water tables from the CNC machine. I can't remember off the top of my head how the grounds of the machine were related.

May I get some advice on this please?

[Al_The_Man]

Well I can only give you my experience with assisting with installation and maintaining of PC based MG Systems Plasma.
Normally a ground rod is driven in at the table and the table is connected directly to this with a conductor size that is at the same as the power supply capacity.
A large ground conductor is also fed from the incoming service panel Earth Ground terminal directly to the ground rod.
It also Pays to ensure the PC based controller supply ground is also bonded to Earth ground, as the PC P.S. is at ground potential through the mother board mounting.
All parts of the machine should be have ground bonding conductors back to a central Earth Ground point that is connected to the service ground.
Al.