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3.1.5.20.(1)
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Application
Application 1: 
Totally enclosed non-metallic raceways not more than 175 mm in outside diameter, or of an equivalent rectangular area, that enclose optical fibre cables, and electrical wires and cables, in buildings described in Sentence 1.3.3.2.(1) of Division A that are required to be of noncombustible construction, where the raceways exhibit a vertical char not more than 1.5 m when tested in conformance with the Test for Flame Propagation (Riser) in Section 3.4 of ULC/ORD-C2024, “Fire Tests for Optical Fibre Cable Raceway” (FT-4 Rating).
Application 2: 
This also applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] that are required to be of noncombustible construction, as stated in Sentence 9.10.6.1.(1).
Application 3: 
This also applies to buildings described in Sentence 1.3.3.2.(1) of Division A that are permitted to be of combustible construction, as stated in Subclause 3.1.4.3.(1)(b)(iv).
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Intent
Intent 1: 
To exempt certain combustible materials from the application of Sentence 3.1.5.1.(1) if certain conditions are met, on the basis that the materials are deemed to insignificantly contribute to the growth and spread of fire.
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