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BTTZ/BTTQ mineral insulated cables, also known as copper-core copper-sheathed magnesium oxide insulated fire-resistant cables, feature a seamless copper tube outer sheath, magnesium oxide powder filling the middle insulation, and a single-strand copper rod conductor. They are characterized by high temperature resistance, strong shielding, safety, environmental protection, fire resistance, explosion resistance, and non-flammability (capable of continuous operation at 250°C for extended periods and even short-term operation at 1000°C for 30 minutes). They also offer high current carrying capacity, a small outer diameter, high mechanical strength, and a long service life. They generally do not require a separate grounding conductor (due to the continuity and extremely low grounding resistance of the copper sheath, they can be used as a grounding conductor). Therefore, they are widely used in dangerous, harsh, and high-temperature environments such as nuclear power plants, metallurgy, chemical industries, mines, and kilns. In the past two years, they have been widely used in public places such as hospitals, high-rise buildings, airports, docks, and subways, serving as a lifeline. They are used to ensure the uninterrupted operation of critical firefighting equipment such as fire pumps, fire elevators, local lighting, emergency evacuation signs, security surveillance, smoke exhaust systems, and self-contained power supplies in the event of a fire.