|  | 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 LAN's 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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