Fireproof cables can be roughly divided into two types, one is flexible mineral insulated fireproof cables, and the other is rigid mineral insulated fireproof cables. So what are the types of flexible fireproof cables and rigid fireproof cables?

Among the fireproof cables, the common models are as follows: BTTZ, BTTRZ (RTTZ), BBTRZ, NG-A (BTLY), YTTW, BTTVZ, only the cables under the BTTZ category are rigid mineral fireproof cables, and the others are Flexible mineral fire-resistant cable.

1. The full name of BTTZ cable is heavy-duty copper core copper sheathed magnesium oxide mineral insulated cable, which is high temperature resistant, fireproof, explosion-proof, and non-combustible (it can run continuously for a long time at 250°C, and can run for a short time of 30min at 1000°C in the limit state. ) and large current carrying capacity, small outer diameter, high mechanical strength, long service life, and generally do not require an independent grounding wire.

The letter meanings of BTTZ fireproof cables are as follows:

B—Fixed installation power cables for wiring
T—copper sheath
T—copper conductor
Z—Voltage resistance level heavy duty 750V

As a rigid cable, BTTZ has the characteristics of complete fire prevention, strong overload protection ability, high working temperature, corrosion resistance and long life, and is suitable for fire protection cables required by fire protection systems in construction projects.

2. The full name of BTTRZ (RTTZ) cable is copper core inorganic mineral insulating tape wrapped insulated copper sheathed flexible fireproof cable. This kind of cable is called mineral insulated cable, also known as fireproof cable with flexible structure. Its production process and BTTZ type The cables are very similar. This type of cable has the characteristics of flexibility and flame retardancy, good bending performance, very convenient for transportation, and safer to use.

The letter meanings of BTTRZ (RTTZ) fireproof cables are as follows:

B—Fixed installation power cables for wiring
T—copper conductor
T—copper sheath
R—softness
Z—Voltage resistance level heavy duty 750V

The difference between BTTRZ and BTTZ is that BTTRZ is a flexible fireproof cable, and BTTRZ can replace BTTZ. The former is a flame-retardant wiring copper cable, and the latter is not flame-retardant. The production process of the two is the same, but the insulating materials used are different, and the former is used more now.

3. The full name of BTTVZ is the full name of heavy-duty copper core copper sheathed magnesium oxide mineral insulated cable. Since all materials of this cable are made of inorganic materials, it has some advantages that other cables cannot have. Such as fire resistance, large carrying capacity, mechanical damage resistance, halogen-free and non-toxic, explosion-proof, waterproof, corrosion resistance, long life, safety, overload resistance, high temperature resistance, low cost, small outer diameter, etc.

B----fixed installation power cable for wiring
T----copper sheath
T----copper conductor
V----polyethylene Y outer sheath
Z----Voltage resistance option, the withstand voltage level is 750V for heavy duty and 500V for light duty

4. The full name of BBTRZ is flexible magnesium hydroxide mineral insulated non-combustible fireproof cable. The structure of flexible mineral insulated cable is flexible structure and materials are made of mineral compounds, which makes up for the defects of hard structure, flammability and toxicity. It also has some The advantages that other cables cannot have, such as: fire resistance, large carrying capacity, impact voltage resistance, mechanical damage resistance, halogen-free and non-toxic, explosion-proof, waterproof, corrosion resistance, long life, safety, overload resistance, high temperature resistance, and low cost Features.

The letter meanings of BBTRZ fireproof cables are as follows:

B—Fixed installation power cables for wiring
B—mineral compound
T—copper conductor
R—softness
Z—Voltage resistance level heavy duty 750V

5. The full name of NG-A (BTLY) is: aluminum sheath flexible isolation type fireproof cable NG-A cable is a soft conductor structure. After special processing, it has good electrical conductivity, mechanical resistance, flexible bending performance and high fire resistance. Performance; mineral materials are densely filled, with high temperature resistance and fire resistance; low-smoke and low-halogen plastic material is used as the outer sheath, which has good anti-corrosion properties.

The letter meanings of NG-A (BTLY) fireproof cables are as follows:

G - isolation
N----refractory
A----950-1000C°
B----Mineral insulated cables for wiring
T----copper conductor
L----aluminum metal sleeve
Y----PVC outer sheath

6. The full name of YTTW cable is flexible fireproof metal sheathed inorganic mineral insulated cable. Fireproof cable is a cable that can burn at a high temperature of 950 degrees and can still be powered on for more than 3 hours. It is mainly composed of an outer sheath layer and a copper conductor core. , and a refractory layer is provided in the outer expansion layer, so it has a high fireproof performance.

The letter meaning of YTTW fireproof cable is as follows:

Y—mineral insulated cable with metal sheath
T—copper conductor
T—copper sheath
W—inorganic mineral insulation