YTTW - The outer surface of the fire-proof cable is welded rolled strip of copper strip. The inner core insulation of the cable is wrapped by fire-resistant mica tape. Finally, the cable is made of glass fiber or other fire-resistant fillers.
BBTRZ - Fire-proof cable is the same as the above structure, which is to replace the refractory mica tape with the ceramic silicone rubber tape. I don't know which of the two different insulated cables is better.
NG-A - The outer sheath of fire-proof cable is made of aluminium, that is, from copper strip longitudinal cladding to aluminium strip longitudinal cladding. The inner core of cable may be wound by several layers of fire-resistant insulating strip.