I opened a heat pump cover and saw this little cable screwed onto the case but it appears to still be insulated from case and is supposed to be used by an electrician. Is this meant to ground the metal case of the machine?
Since there is no other external pin on the case, is this internal wire meant to be in contact with the case itself and in case of a malfunction that would put case under current, it would provide the current a path to the ground by going (I assume) to the same place the power supply cable ground cable connects to internally?
Or could it potentially be connected to the case on the other side (not visible on image) and is expected from electrician to pull this cable out through the case and connect it to some external grounding wiring? Or could it also be used just for bonding with other conductive items in the area?
I understand this requires professional. I am just curious to know if this is a rough explanation of what it does. The instruction manual provides no explanation and both seller and manufacturer failed to provide any response so far.