FOXBORO P0911VJ Switch

Within each system, each subsystem is single-point grounded. Each of the system ground points is then connected to a tree ground bus with a single insulated conductor (usually yellow). (c) The single-point establishes a signal reference plane in each unit or piece of equipment, and these individual reference planes are connected together and to the earth electrode subsystem. An important advantage of the single-point configuration is that it helps control conductively-coupled interference. As illustrated in figure 3-36, closed paths for noise currents in the signal ground network are avoided by the single point signal reference subsystem. The interference voltage, VN in figure 3-36, in the facility ground system is not conductively coupled into the signal circuits via the signal reference subsystem. Therefore, the single-point signal reference subsystem minimizes the effects of lower frequency noise currents, which may be flowing in the facility ground.

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