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9.10.9.6.(5)
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Application
Application 1: 
Combustible totally enclosed raceways that are embedded in concrete floor slabs, in an assembly required to have a fire-resistance rating, where the concrete provides not less than 50 mm of cover between the raceway and the bottom of the slab.
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To exempt combustible totally enclosed raceways from the requirements of Sentence 9.10.9.6.(2) if certain conditions are met, on the basis that the raceways are protected by a concrete covering and should not contribute significantly to the growth and spread of fire.
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