> For the complete documentation index, see [llms.txt](https://hyundai-robotics.gitbook.io/hi6-s-controller-maintenance-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hyundai-robotics.gitbook.io/hi6-s-controller-maintenance-manual/cm-english/3-install-controller/3-6-connection/4-controller-grounding.md).

# 3.6.4 The Controller and Grounding

For using the controller safely, connect the grounding wire to the controller. Use a grounding wire of 5.5㎟ or more. (Grounding of Category 3).