BTLY insulated (flexible) mineral insulated cables are all made up of inorganic substances (copper and magnesium oxide powder). They will not cause fire and can' t be burned or ignited. Because the melting point of copper is 1083 C and the melting point of magnesium oxide is 2800 C. this kind of cable can keep power supply in the case of fire near the melting point of copper.It is a true fire-proof cable. This series of cables cover a wide range of applications, not only overcome the shortcomings of rigid fire-proof cables, but also give full play to the advantages of flexible fire-proof cables, which make modern engineering achieve the effect of short-circuit non-combustion and non-short-circuit combustion in electrical lines. Mineral insulated fire-proof cables (BTLY) play an important role in protecting lives, materials and information security, and are widely used in trunk lines,fire-proof lines and escape routes. Rescue system, such as emergency lighting, fire monitoring, alarm system, elevator system,smoke exhaust system, as well as control lines and other fields.