FOXBORO ZCP270 Thermal resistance input/output module

 (primarily 50/60 Hz power) from developing voltage differentials between points on the ground network. (b) The inter-equipment or facility ground system should not be expected to provide the primary return path for signal currents from the load to the source. Figure 3-37 illustrates a way of discriminating against those extraneous signals which may inductively or capacitively induce currents into the grounding network and develop differential voltages between the source and the load.

The purpose of this isolation is to prevent stray currents

(c) The lower frequency grounding network must be connected to the earth electrode subsystem at only one point. (d) The network must be configured to minimize conductor path lengths. In facilities where the equipment to be connected to the ground network are widely separated, more than one network should be installed.

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