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Flexible Equipment and Vibration Isolator

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According to CBC 98, Table 16-0, item 3.C, for flexible equipment laterally braced or anchored to the structural frame at a point below their center of mass: 

                Rp = 3.0

According to the same table 16-0, footnote 14, for equipment supported on vibration isolator:

                 Rp =1.5

Somebody care to explain the difference? I would expect any equipment supported on vibration isolators would fall under flexible equipment.

Satish