If you have circuit conductors spliced within a box or terminated on equipment within (or supported by) a box, any equipment grounding conductors (EGCs) associated with those conductors must be connected within (or to) the box [250.148]. Exception: the EGC permitted by Sec. 250.146(D) (for isolated ground receptacle applications) doesn’t have to be connected to the box or other ECGs.
Devices used to make those connections must be suitable for the use. And the connections must co