So I have the common 2.2kw spindle and vfd. Plug has 4 wires, I figured out that pins 1 through 3 are for phases but pin 4 is connected to nothing inside the spindle, no ground. How do I do this properly? I have 4 conductor cable with braided sheathing. Should I just run the ground wire to a bolt on my spindle mount instead of the 4th pin? Or open up the top and ground it internally? Also what about the braided sheathing? Ground it at the spindle? Or at the vfd? Or both? Lots of conflicting info out there. What is proper?