Are the main power port and the servo rail GRNDS connected or are they isolated completely?

I'd like to know if I will have a ground loop with the attached layout.

Curent sensor powering pixhawk and a UBEC powering servo rail

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In addition to what has been said about using a 5V BEC instead of a 6V BEC to power the servo rail, and confirming that ground loop is unavoidable and OK, you also must care for plugging ALL of the ground wires of your ESCs.

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