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 Question by wayne stidham posted 13 Feb 2003
drawbacks to one idf for every 2 floors cabled.
 Answer by Dmitri Abaimov posted 13 Feb 2003
Dear Wayne,

None if it's still within 90 meters (295') and you firestop the floor penetrations if needed.

Don't go more than three floors though: if the horizontal cable is PVC, then it burns very well when fire starts on the first floor and the cable is routed vertically. Plus it becomes more difficult to control tension on the cables since there is a chance than the whole bundle will become hanged on just one single cable thus exceeding that cable’s maximum pulling tension.

Dmitri Abaimov, RCDD

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