|  | 8.9 | Design Practice No. 2: Multiple Earth Ground Problems
| 8.9.1 | Overview
In order to learn how multiple earth grounds can impact a LANs wiring scheme, assume that you have been asked to prepare a wiring plan for a twenty-story building. Three companies occupy the building: Company A occupies the first fifteen floors. Company B occupies the sixteenth, seventeenth, and eighteenth floors. Company C occupies the nineteenth and twentieth floors. The description of the building is as follows: The building has three separate supplies of power. Each has its own earth ground. None of the earth grounds is identical. The height of each story is 4.9 m. Only one wiring closet is needed on each floor, to supply horizontal cabling runs to the work areas located there. The POP is located on the first floor.
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