Key points to note about mineral-based cables:
1. BTTZ cables have the highest fire resistance rating, but each cable is limited to 300 meters; therefore, they have numerous intermediate joints, which are susceptible to moisture and require strict construction requirements.
2. BTTZ and YTTW cables do not have five-core cables. Important things must be said three times.
3. Except for BBTRZ cables, all cables have metal tube sheaths, which can be used as grounding wires. BTLY cables use aluminum tube grounding, and each core requires a connector to be connected in parallel.
4. In 2018, YTTW cables officially implemented the national standard GB/T 34926-2017, "Mica-taped, mineral-insulated, corrugated copper-sheathed cables and terminations for rated voltages up to 0.6/1 kV."
