|  | 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:

1. What would be the distance to the eleventh floor IDF, from the MDF?
2. What would be the distance to the twelfth floor IDF, from the MDF?
3. What would be the distance to the thirteenth floor IDF, from the MDF?
4. What would be the distance to the fourteenth floor IDF, from the MDF?
5. What would be the distance to the fifteenth floor IDF, from the MDF?

(Note: Backbone cabling must also run from the MDF to each of the floors below it.)

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