Grounding problems

My Stepcraft D840 is losing steps. It looks like it is a grounding issue. The machine has a cabe(yellow and gren) installed but I didn’t plug it in the wall becose as I understand you only plug the cable in certian type of wall electricity plugins wich normal houses don’t have. I would like some suggestions (pictures if possible) how to properly ground the machine so it does not have static discarge?

Thank you