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In Canada said:The markings for wires and cables meeting the flame spread requirements of the National Building Code of Canada
(without additional fire protection) are
(a) FT1* — wires and cables that are suitable for installation in buildings of combustible construction;
(b) FT4† — wires and cables that are suitable for installation in
(i) buildings of non-combustible and combustible construction;
(ii) spaces between a ceiling and floor, or ceiling and roof, that may be used as a plenum in buildings of
combustible construction; and
(c) FT6‡ — wires and cables that are suitable for installation in
(i) buildings of non-combustible and combustible construction; and
(ii) spaces between a ceiling and floor, or ceiling and roof, that may be used as a plenum in buildings of
combustible or non-combustible construction.
*Communication and optical fiber cables marked CMP, CMR, CMG, CM,