Rigid fire-resistant cableA

BTTZ cables, known domestically as fire‑resistant cables, have been manufactured on a dedicated production line that enables the company to produce magnesium oxide‑based cables in extended lengths—up to 1,000 meters per conductor, compared with the traditional limit of 50–100 meters. This capability effectively addresses the drawbacks associated with short cable lengths and numerous splices, significantly reducing project investment costs, accelerating installation, and ensuring reliable, stable performance.

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Fire-resistant cable

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Product Description

BTTZ cable In China, these cables are known as fire‑resistant cables. In recent years, the company has invested in a dedicated production line for magnesium oxide cables (BTTZ) capable of manufacturing lengths of up to 1,000 meters per cable—far exceeding the traditional limit of 50–100 meters per cable. This innovation effectively addresses the numerous drawbacks associated with short cable lengths and frequent splices, significantly reducing project investment costs, accelerating installation, and ensuring reliable, stable operation.

BTTZ Cable Description:
BTTZ is a heavy‑duty, fire‑resistant cable with a copper conductor and a copper sheath, featuring magnesium oxide insulation (also known as a heavy‑duty mineral insulated cable). It is a novel type of cable that employs a seamless copper tube as its outer sheath, fills the space between the conductor and the sheath with magnesium oxide powder as the insulating material, and uses a single‑strand copper rod as the conductor.

Model number	Specifications	Number of cores	Rated voltage
BTTZ	1.0~400mm²	1, 2, 3, 4, 7, 12, 19 cores	750V
BTTVZ	1.0~400mm²	1, 2, 3, 4, 7, 12, 19 cores	750V
WD-BTTYZ	1.0~400mm²	1, 2, 3, 4, 7, 12, 19 cores	750V
BTTQ	1.0~4mm²	1, 2, 3, 4, 7 cores	500V
BTTVQ	1.0~4mm²	1, 2, 3, 4, 7 cores	500V
WD-BTTYQ	1.0~4mm²	1, 2, 3, 4, 7 cores	500V

B----Fixed‑installation power cable for wiring T----Copper sheath T----Copper conductor Z----Heavy‑duty, voltage‑rated up to 750 V

1. The full name of BTTZ cable is Heavy-Duty Copper-Conductor, Copper-Sheathed Magnesium Oxide Mineral-Insulated Cable.
2. Mineral-insulated cables with a cross-sectional area of 25 mm² or greater are all single-core.
3. Specifications: 1×6~1×400mm² | 2×1.0~2×25mm² | 3×1.0~3×25mm² | 4×1.0~4×25mm²

BTTZ cable characteristics:
It features high-temperature resistance, fire‑proofing, explosion‑proofing, and non‑combustibility (capable of continuous long‑term operation at 250°C and short‑term operation for 30 minutes even under extreme conditions of 1,000°C), along with high current‑carrying capacity, a small outer diameter, high mechanical strength, and an extended service life; moreover, it typically does not require a separate grounding conductor.

BTTZ Cable Applications:
It is widely used in high-rise buildings, nuclear power plants, metallurgical facilities, chemical plants, mines, kilns, and other hazardous, harsh, and high-temperature environments. In recent years, it has also been increasingly deployed in high-rise buildings, airports, ports, subways, and similar venues to ensure the uninterrupted operation of fire‑fighting pumps, fire‑fighting elevators, local lighting, emergency evacuation signage, security surveillance systems, smoke control and exhaust systems, as well as standby power supplies and other critical fire‑protection equipment during a fire.