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Where does the P9 4 pin connection go to in the CCU?

Connection point for the 4 pin P9

Product Line:
GT250, GT500MVX, GT500-480, GT100-208

Enviornment :
3phase utility scale troubleshooting

The P9 4pin plug is the common(GND) connection of the CCU.  The wire connected to P9 goes all the way to the GND bus bar TB2 in the AC compartment.  This connection is installed by the factory and it is routed through and uses tie wraps.  If the 4 pin connection is unplugged, all that is needed is to plug it back in.
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