|  | 8.9 | Design Practice No. 2: Multiple Earth Ground Problems
| 8.9.4 | Company A: IDFs and ICCs
To determine which IDFs will be ICCs, multiply each floor by its height as you move away from the MDF. Assuming that the backbone cabling runs will all be vertical, from the MDF to the IDF on the ninth floor, the distance would be 4.9 m. The distance from the MDF to the tenth floor would be 9.8 m. Then answer the following questions: What would be the distance to the eleventh floor IDF, from the MDF? What would be the distance to the twelfth floor IDF, from the MDF? What would be the distance to the thirteenth floor IDF, from the MDF? What would be the distance to the fourteenth floor IDF, from the MDF? What would be the distance to the fifteenth floor IDF, from the MDF? At first glance it appears that the ICC would be located on the fourteenth floor. Can you think of a reason why this would not be a good location for the ICC? After completing these calculations, you have decided to place one ICC on the thirteenth floor. Where would you place the second ICC? (Note: Backbone cabling must also run from the MDF to each of the floors below it.)
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