This fire test standard applies to non-metallic raceway systems for optical fibre cables, communication cables and electrical wires and cables with combustible insulation and jackets designed for use in accordance with applicable electrical and building codes in Canada and that are: (A) Intended for the protection of cables that are not rated FT6 or FT4 (Class 1); or (B) Used with cables rated FT6 or FT4 (Class 6). Provisions are included to allow for an optional measurement of light obscuration in the combustion stream in the exhaust duct.