I did have a link to a document that detailed grounding/sheilding, and how things should be wired, but I can't find it.

Have a read over this thread - GROUNDING - what is the correct way to ground a CNC machine?


Found it - http://www.automation.siemens.com/do.../emv_r.pdf?p=1
Might take you a few reads to digest all the info, but explains things pretty well.