repeat, separating the dc distribution circuits from any conductive paths in common with ground currents will in general reduce or eliminate ground loop problems.
Figure 39. Isolating Ground Loop Paths from DC System
The only way to avoid such common paths is to connect the dc distribution system to ground with only one wire. Figure 39 illustrates this concept. DC (and signal) currents circulate within the DC System, while ground loop currents circulate within the Ground System.
Providing there is only one connection between the two systems, the ground loop currents do not affect the power supply dc output and load circuits.
Notice that any magnetic coupling between the DC System and Ground System, or any capacitive leakage from the DC System to ground can provide a return path enabling additional ground loop current to link both the DC System and Ground System.
67
