FOXBORO P0997ND Input module

Thus, a danger with the floating system is that power faults to the signal system would cause the entire system to rise to hazardous voltage levels relative to other conductive objects in the facility. Another danger is the threat of flashover between the structure or cabinet and the signal system in the event of a lightning stroke to the facility. Not being conductively coupled together, the structure could be elevated to a voltage high enough relative to the signal ground to cause insulation breakdown and arcing. This system generally is not recommended for C-E facilities.(2) A second configuration for the signal ground network (for lower frequencies, 0-30 kHz up to 300 kHz) is the single-point approach illustrated in figure 3-33. With this configuration, the signal circuits are referenced to a single point, and this single point is then connected to the facility ground.

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