Carbon fiber composite coreconductor

Carbon fiber composite wire is a high-strength carbon fiber composite power transmission wire. It has a core and a ring-shaped conductive layer wrapped around the core. The core is a conductive core composed of carbon fiber, and there is a composite conductive core composed of carbon fiber. It is composed of carbon fiber and aluminum or copper wire twisted.
This kind of carbon fiber composite core wire has many advantages and is the strength of contemporary scientific and technological development. It uses the high strength and corrosion resistance of carbon fiber to produce a new type of wire. Compared with the conventional steel core aluminum stranded wire, the carbon fiber The fiber composite core conductor has obvious advantages. It has many characteristics such as light weight, high tensile strength, high temperature resistance, radiation resistance, and large current carrying capacity. It can be said that all aspects of performance are upgraded.

The carbon fiber composite core wire has a very strong transmission capacity. It can effectively reduce power loss during the process of transporting electrical energy. It has high heat resistance and can continue to work under a high temperature environment of 160 degrees, even in a peak environment. Can fully meet the demand.

The tensile strength of general steel wire is 1240MPa, while the strength of carbon fiber composite core can reach more than 2400MPa, and the strength safety factor of carbon fiber composite core wire is increased by nearly 2 times. Not only the strength is enhanced, the expansion coefficient of the carbon fiber composite core wire is also very small, which avoids the thermal expansion sag of the traditional steel core cable. The height of the poles and towers can be reduced, and the distance between the poles can be increased, thereby reducing the transmission line corridors and saving land resources. This makes it not only have a strong comprehensive benefit advantage in the transformation of the old line; even in the construction of the new line, it also has a competitive advantage.

Test method for flame retardant performance of cable materials

Most polymer materials are flammable and combustible materials. They have a large heat release rate during combustion, high calorific value, fast flame propagation speed, difficult to extinguish, and sometimes produce dense smoke and toxic gases, which cause huge damage to people’s lives and the environment. harm. Today we will introduce in detail the three common flame retardancy tests of polymer materials: horizontal combustion test method, vertical combustion test method, and oxygen index method.

1. Horizontal combustion test method
The horizontal burning test method is to test the burning performance of a sample under horizontal support under laboratory conditions. There are many standards for horizontal burning test methods, mainly in the testing of wires and cables, plastics, leather, and blankets.
Horizontal combustion test chamber of National High Material Analysis and Testing Center
Horizontal burning test test standard
GB/T 12666.2-2008 Single wire and cable burning test method Part 2: Horizontal burning test
GB/T 8332-2008 Test method for the combustion performance of foam plastics Horizontal combustion method
MH/T 6047-2008 Four-layer horizontal burning test method for aviation blanket
QB/T 2729-2005 Leather Physical and mechanical test Determination of horizontal burning performance
Specific test method of horizontal combustion test
1) Test device
The test was carried out in a combustion box, and a Bunsen burner with an inner diameter of 9.5 mm was installed on the left inner side of the box. There is a test piece clamp for fixing the test piece on the right side of the inside. The Bunsen burner tilts up 45 degrees and is equipped with a forward and backward device. The test gas is natural gas, liquefied petroleum gas or coal gas, and it is equipped with a stopwatch and a caliper.
2) Test method
A. Specimen preparation
Each material needs 5 specimens, each specimen shall be flat and smooth, without bubbles, 125±5mm in length, 13.0±0.3mm in width, and 3.0±0.2mm in thickness. The test can also be carried out on samples with a thickness of 2-13mm. , But the results can only be compared between the same thickness.
B. experiment procedure
First, draw a marking line on the wide surface of the sample at 25 mm and 100 mm from the ignition source, and then place the test piece horizontally on the long axis, and fix it on the test piece clamp at a 45-degree angle to the horizontal axis of the cross section. Place a drip tray 300mm below it. Ignite the Bunsen burner, adjust the flame length to 25mm and create a blue flame, and apply the tip of the flame core to the lower edge of the sample about 6mm in length. And start timing, applying flame time is 30 seconds. During this period, the Bunsen burner shall not be moved, but during the test, if the specimen has burned to the first marking line in less than 30 seconds, the application of flame shall be stopped immediately. The following observation records should be made after stopping the flame.

a. Whether there is a visible flame within 2S;
b. If the sample continues to burn, record the time t that the flame front takes from the first marking to the second marking, and find the burning speed V: V=75/t (mm/min)
c. If the flame reaches the second mark and extinguished before, record the burning length S:S=(100-L)mm where: L——the shortest distance from the second mark to the unburned part, accurate to 1mm. Observe other phenomena, such as melting, curling, carbon formation, dripping and whether the dripping material burns.
C. Evaluation of results
Each trial is classified as follows
a. GB2408-80/Ⅰ: The sample is extinguished within 2s after the fire source is evacuated
b. GB2408-80/Ⅱ: The flame front is extinguished before reaching the second standard. At this time, the burning length S of the sample should be reported (if the burning length is 50mm, report it as GB2408-80/Ⅱ-50mm)
c. GB2408-80/Ⅲ: When the flame front reaches or exceeds the second marking line, the burning speed V should be reported at this time (if the burning speed is 20mm/min, report as GB2408-80/Ⅲ-20mm/min). The test results are based on 5 tests. The category with the largest number in the piece is used as the evaluation result of the material, and the maximum burning length or burning speed is reported.
2. Vertical burning test method
The vertical combustion method is a method to classify the combustion of a sample with a certain specification placed vertically after applying flame action under specified conditions.
Vertical burning test test standard
GB 32086-2015 Technical requirements and test methods for vertical combustion characteristics of specific types of automotive interior materials
GB/T 12666.1-2008 Single wire and cable burning test method Part 1: Vertical burning test
GB/T 8333-2008 Rigid foamed plastic burning performance test method vertical burning method
JB/T 4278.18-2011 Rubber plastic wire and cable testing equipment verification method Part 18: Single copper core insulated thin wire and cable vertical burning test device
JB/T 4278.5-2011 Rubber plastic wire and cable testing equipment verification method Part 5: Single insulated wire and cable vertical burning test device
JJF (Textile) 068-2016 Calibration Specification for Vertical Burning Tester
JJF (Textile) 068-2018 Vertical Burning Tester Calibration Specification
FZ/T 98017-2018 Textile Vertical Burning Performance Tester
Specific test method of vertical combustion test
1) Test device
The test is carried out in a combustion box with an internal size of 329mm×329mm×780mm. The top of the combustion box has an exhaust hole with a diameter of 150mm. In order to prevent the influence of external airflow on the test, a top plate is added 25mm from the top of the box. The right side of the combustion box is equipped with a test piece holder support, and the test piece can be fixed. Located in the center of the combustion box. A Bunsen burner inclined 45 degrees upwards is installed on the left side of the box. Fixed on the horizontal slide of the control box. A bracket for putting absorbent cotton is placed in the lower part of the box. Other spares are a stopwatch and calipers.

2) Test method
A. Specimen
Each group of samples requires 5 test pieces, which are required to be smooth and free of bubbles. Length 130±3mm, width 13.0±0.3mm, thickness 3.0±0.2mm. The prepared test piece should be adjusted for 48 hours under standard climatic conditions.
B. experiment procedure
The test piece is vertically fixed on the test piece clamp, and the clamped part of the upper end of the test piece is 6mm. Put the absorbent cotton. Ignite the Bunsen burner at a distance of 150mm from the test piece, adjust the flame height to 20±2mm, and show a blue flame. Place the center of the Bunsen burner 10mm at the lower end of the test piece, and aim the flame at the center of the lower end of the test piece. start the timer. After applying flame to the test piece for 10 seconds, remove the fire source, record the flame burning time of the test piece. After the flame burning of the test piece is extinguished, apply the flame for another 10 seconds according to the above method, and record the flame burning and non-flame burning of the specimen after the flame is removed. Flame burning time.
C. Result evaluation
The combustion performance of the test piece is specified as FV-0, FV-1, FV-2 three levels as follows.
FV-0: The vertical sample stops burning within 10 seconds; no droplets are allowed;
FV-1: The vertical sample stops burning within 30 seconds; no droplets are allowed;
FV-2: The vertical sample stops burning within 30 seconds; burning substances are allowed to drip.
If one group of 5 samples does not meet the requirements in the table, another group of samples should be taken for testing, and the second group of 5 samples should all meet the requirements. If there is still one sample in the second group that does not meet the corresponding requirements in the table, the level with the largest value in the two groups shall be used as the level of the material. If the test result exceeds the requirements of FV-2, the material cannot be evaluated by the vertical combustion method for oxygen index.
3. Oxygen index method
There are still many products suitable for flame retardant performance testing-oxygen index method, such as viscose, polyester fiber, synthetic fiber, plastic, textile, asphalt and so on.
Flame Retardant Performance Test-Oxygen Index Test Standard
FZ/T 50016-2011 Viscose staple fiber flame retardant performance test method Oxygen index method
FZ/T 50017-2011 Flame Retardant Test Method of Polyester Fiber Oxygen Index Method
FZ/T 50029-2015 Synthetic fiber raw material chip flame retardant test method-oxygen index method
GB/T 16581-1996 Test method for burning performance of insulating liquid-Oxygen index method
GB/T 2406.1-2008 Plastics Determination of combustion behavior by oxygen index method Part 1: Guidelines
GB/T 2406.2-2009 Plastics Determination of combustion behavior by oxygen index method Part 2: Room temperature test
GB/T 5454-1997 Textiles Burning performance test Oxygen index method
GB/T 8924-2005 Test method for burning performance of fiber reinforced plastics Oxygen index method
GSB 08-3562-2019 Plastic (PMMA) oxygen index standard sample
NB/SH/T 0815-2010 Determination of Asphalt Combustion Performance Oxygen Index Method
TB/T 2919-1998 Fabric combustion oxygen index test method
Specific test method of oxygen index
1) Refer to GB2406 “Plastic Flammability Test Method-Oxygen Index Method”, which stipulates that the lower end of the clamp can be used to measure the plastic that can stand upright. The burning time of the sample is 3 minutes. A marking line is drawn from the wide surface of the sample 50mm from the ignition end. When the burning time of the sample exceeds 3 minutes or the flame front exceeds the marking line, the oxygen concentration is reduced. When the burning time of the sample is less than 3 minutes or the flame front is less than the marking line, the oxygen concentration is increased. Repeat this process until the oxygen concentration obtained by both The difference is less than 0.5%.
2) Test method
A. Specimen preparation
Each group of samples should have 5-10 test pieces, each of which is 70-150mm long, 6.5±0.5mm wide, and 3.0±0.5mm thick, and the surface of the test piece is required to be smooth and free of bubbles.
B. experiment procedure
Before the test is carried out, the test piece shall be marked with a graduation line at a distance of 50mm from the ignition source, and then installed vertically on the test piece holder. The distance between the upper end and the combustion cylinder shall be greater than 10mm. The initial oxygen concentration shall be estimated and adjusted, and it shall be kept burning at all times. The air flow velocity in the barrel is 40±10mm/s. Let the adjusted air flow for 30 seconds to clean the combustion tube. Then use an igniter to ignite the top of the test piece. When it is confirmed that the top of the test piece is fully ignited, remove the igniter and start timing. Do not change the flow rate and oxygen concentration arbitrarily at this time. During the test, if the burning time of the sample exceeds 3 minutes, or the flame front exceeds the marking line, the oxygen concentration should be reduced before the test. , On the contrary, the oxygen concentration should be increased. When adjusted to the oxygen concentration value increase or decrease the difference is less than 0. At 5%, the oxygen index of the material should be calculated based on the reduced oxygen concentration value. Three tests were performed within this range.
C. Result calculation
The calculation formula of oxygen index (OI): OI=[O2] / [O2]+[N2]×100% where [O2]——Oxygen flow rate L/min: [N2]——Nitrogen flow rate L/min. Three times The average of the test results is the oxygen index of the material.
The oxygen index of various organic polymers has been measured. Generally, substances with OI≥27 are flame-retardant substances.
D. discuss
Factors affecting oxygen index
a. Flow rate
At 30 and 120mm/s, OI is almost independent of air flow. The flow rate must be fast enough to remove burned gas from the nearest atmosphere, but not too fast to avoid increasing the mixing speed at the front of the fire.
b. The thickness of the sample
The material becomes more combustible as the sample becomes thinner, and the oxygen index value decreases.
c. pressure
Some polymers have OI that is sensitive to reduced pressure, which may accelerate the degradation of the polymer due to the continuous removal of products.
d. Inert gas
When Ar, Ne, CO2 gas is used, the oxygen fraction (OF) required to maintain combustion is expressed as: OF = [O2] / [inert gas]
The OF value increases linearly with the heat capacity of the gas. When Hr is used, the OI value is 50% larger than expected. This is due to the high thermal conductivity of Hr gas that takes heat away from the flame.
e. temperature
Temperature has a great influence on OI, and temperature has little influence on OI at room temperature. The relationship between OI and temperature of various polymers is different at high temperature.
f. Relationship between value and ignition position
Bottom ignition and top ignition can get different oxygen index values. Bottom ignition is closer to the actual combustion situation than top ignition, and its oxygen index value is much lower.

There are so many types of cables, how can I remember them?

Each industry has skills and shortcuts for each industry, so in the wire and cable industry, how to remember the problem of cable models is a skill of the industry. Only those who are knowledgeable can remember, and those who don’t understand can learn and understand.
There are many specifications and models of power cables, and they are also very complicated. To be honest, you brought an unusual model, and I don’t know it. Therefore, this article mainly introduces: the composition law of cable specifications. Once you have mastered this law, even if you see something you don’t know, you can know what kind of cable it is and what materials it consists of as long as you find the meaning of the corresponding letter or number.

We often put the specifications and models together. In fact, these two are different categories. You can see from your company’s certificate that the specifications, models, and rated voltages are written separately.
Specification is the main material composition of the cable. Different materials are suitable for use in different places, and different specifications have different uses. Our common cable specifications are VV, YJV, NH-YJV, YJLV, etc. Each letter and number in it has a different meaning.
Common insulating materials are: V (polyvinyl chloride), YJ (cross-linked polyethylene)
Conductor: T (copper, generally omitted and not written), L (aluminum), HL (aluminum alloy)
Common outer sheath materials are: V (polyvinyl chloride), Y (polyethylene)
The armor layer is represented by numbers: 22 (double steel belt wrapping), 32 (thin round steel wire)
Some cables need special properties: NH (fire-resistant), ZR (flame-retardant)
The above is the composition rule of the specification, namely: (special performance)-insulation-conductor-outer sheath-armor layer. For example, NH-YJV is a fire-resistant XLPE insulated PVC sheathed copper core cable; ZR-YJLV is a flame-retardant XLPE insulated PVC sheathed aluminum core cable; WDZ-YJV22 is a low-smoke, halogen-free Type XLPE insulated PVC sheathed copper core cable.

Another category is the intuitive cable model. The cable model indicates the number and size of the neutral wires of the main line. There are 3 grades, 4 grades, 5 grades, 3+1, 3+2, 4+1, etc. 3×4 means three 4mm2 cables; 3×120+1×70 means three 120mm2 main wires and a 70mm2 four-core cable.
There is nothing to elaborate on the model, you just need to remember one point: According to the GB/T standard, the main line of the cable is generally not less than twice the zero line (except for aluminum alloy cables), and only two are special, namely: 35mm2 The main line adds a 16mm2 zero line, and the 150mm2 main line adds a 70mm2 zero line.

Classification of home improvement wires

BV wire, full name copper core PVC insulated wire, referred to as plastic copper wire. That is, a general-purpose single-core hard conductor non-sheathed cable with a diameter of 1mm or more.
It is suitable for wires used in power installations, household appliances, meters and telecommunication equipment with AC voltage of 450/750 and below. It has the characteristics of acid and alkali resistance, oil resistance, moisture resistance, mildew resistance, and long service life. Because it has a certain degree of hardness, it is more convenient in straightening and folding corners.

BVR wire is generally a wire twisted together by 19 copper wires with a diameter of less than 1mm. It is a copper core PVC insulated flexible wire.
The letter B stands for wiring (for example: make an indoor power line and tack it on the wall);
The letter V-polyvinyl chloride plastic sheath (a V stands for one layer of insulation and two V stands for double insulation), which is a plastic insulation layer.

L stands for aluminum wire, without L stands for copper wire.
The letter R stands for soft wire. To be soft, it means to increase the number of conductors and reduce the diameter of each wire.
It is suitable for the occasions where flexibility is required for wiring and the rated voltage is lower than 450/750 with slight movement. When multiple pipes are pierced at the same time, due to the low hardness, it is easy to turn and convenient for construction. Compared with the hard wire, the production is more complicated, and the high-frequency circuit has a larger carrying capacity than the hard wire.
Classification of common specifications and models of wires
Common specifications of wires are 1.5 square, 2.5 square, 4 square, 6 square, and 10 square. The square of the wire is square millimeters, which is the size of the cross-sectional area of ​​the wire.

Points to note for cable operation and maintenance

The operation of power cable lines is extremely important in the entire power production process. Because the safety of cable lines is directly related to the production safety of enterprises and the safety of people’s lives and properties, it is extremely important to understand the operation and maintenance of power cables and lines. Things.

In the power industry, the so-called cable line actually refers to the line for the transmission of electric energy by the cable. Generally, it is composed of cables, cable intermediate joints, and electrical line ends. It also includes laying related projects, such as cable trenches, pipes, and shafts. , Tunnels, etc., according to the different construction requirements of different geographical environments, the cable lines will be adjusted according to local conditions.

Compared with overhead  conductor lines, cable lines have many advantages. One is that they are not affected by natural disasters, such as heavy rain and snow. Cable lines can better isolate these factors. The second is to make the city look neater, and the construction of cable lines will not be disturbed by the trees along the city, beautify the city, and avoid the risk of electric shock for urban people.

Sino-European submarine cable put into use this year

Submarine cables are cables wrapped with insulating materials and laid on the seabed for telecommunications transmission. Submarine cables are divided into submarine communication cables and submarine power cables. Modern submarine cables use optical fibers as materials to transmit telephone and Internet signals. In 1850, people laid the world’s first submarine cable between Calais (France) and Dover (UK). In August 1858, a British private company founded by Sellers Westfield was established in Ireland. (Europe) and Newfoundland (North America) completed the laying of the first intercontinental submarine communication cable. China’s first submarine cable was completed in 1888.

In ancient times, the rulers of the land of China were eager to get in touch with the countries of the Western Regions, so in the period of Emperor Wu of the Han Dynasty, Zhang Qian was sent to the Western Regions to make the Western Regions understand that there was a powerful Han Dynasty on the eastern continent.

Today is the era of the information Internet. The connection of cables can enable the exchange of information between various regions. According to relevant descriptions, this cable will connect China and Pakistan on land, and after that, it will pass through the seabed to the Horn of Africa. , And the focus of its final connection is Marseille in France.

Factors restricting the development of the cable industry

The cable industry has developed to now, and the overall size is very large, with a large number of companies. China has surpassed the United States to become the world’s largest cable manufacturer. However, in this rapid development process, many problems have gradually been exposed.
The first problem is that there are few large domestic cable companies, and they lack competitiveness with foreign cable companies in high-end products. Even in 2018 or so, the annual output value of the top ten companies in  ACSR cable production scale is not as good as the total output value of the industry. 20% of the total, which is in sharp contrast with developed countries. However, it is roughly the same as my country’s current economic structure, and it is basically the same as that of other industries.

The second problem is that the homogeneity of products is serious and the market competition is fierce. There are a large number of cable companies in China, most of which are small and medium-sized enterprises. The operation mode, management and technical level of these companies present serious homogeneity problems. The problem of homogenization has aggravated overcapacity. In a homogeneous product market, users are mainly concerned with price, and competition is almost entirely concentrated on price. The greater the surplus of homogenized production capacity, the fiercer the price competition, the thinner the profit, and the more difficult it is for a company to survive.

The third problem is that the pressure of funds is huge. The xlpe cable industry is a typical heavy-material and light-industry industry and a capital-intensive industry. Therefore, the cable industry is always facing the pressure of the capital chain. The most significant phenomenon is the application of many companies. The total amount of money collected accounts for a high percentage of annual revenue, many of which are 30%. This also leads to financial difficulties for companies, and China’s cable industry is mostly small and medium-sized enterprises, so these companies are generally facing financial pressures. The problems of difficult financing, expensive financing, and high financing costs have sharply increased the risks in the capital chain of enterprises. In the past two years, due to the tightening of the entire financial system, many companies have found it difficult to cope and shut down and revert.

Talking about the definition and function of weak current wires

1. Definition of weak current wires
Weak current cables refer to cables used for security communications, electrical equipment and related weak current transmission. There is no strict boundary between “wire” and “cable”. Generally, products with a small number of cores, small product diameters, and simple structures are called wires, those without insulation are called bare wires, and the others are called cables; those with a larger conductor cross-sectional area (greater than 6 square millimeters) are called large wires. Small (less than or equal to 6 square millimeters) are called small wires, andXLPE insulated cables are also called cloth wires.
RVS fire wire
2. The role of weak current wires
The main processing object of weak wires is information, that is, the transmission and control of information, which is characterized by low voltage, low current, low power, and high frequency. The main consideration is the effect of information transmission, such as the fidelity, speed, breadth and reliability of information transmission, that is, the line that realizes the transmission of weak electrical signals.

RVVP shielded wire
3. Types of weak current wires
1. Telephone line, large logarithmic HYA: wire specifications are 2*1, 2*0.5, 4*1, 4*0.5, large logarithmic HYA has 10 pairs, 20 pairs, 30 pairs, 50 pairs, 100 pairs And so on, are all in pairs.
2. Video cable SYV series and SYWV series: SYV is a video cable for monitoring, such as video cable SYV75-5; SYWV is a cable TV cable, which belongs to physical foaming; there is also an elevator frequency cable SYXV.
3. Power cord RVV series: mainly used for weak current power supply, sometimes also used for control, such as RVV2*1.0.
4. RVS, RVB, RVVB series, including common type, fire-resistant type, and flame-retardant type. RVS is generally used in fire fighting systems.
5. Network cable: UTP is unshielded, FTP is shielded, such as: Category 5 unshielded network cable UTPCAT.5e, Category 6 shielded network cable is FTPCAT.6e.
6. Shielded wire RVVP series: The appearance is similar to the RVV power cord, except that there is an extra layer of shielding net in the structure, and a letter P is added to the model. Generally, wires with P have a shielding layer.

What kind of cable is HFTGB?

HFTGB series of flexible synthetic mineral insulated fireproof cables are made of copper stranded wire as conductor, wrapped with mineral oxygen barrier, extruded with synthetic mineral insulating material, and then covered with synthetic mineral belt, and the outer layer is spirally wrapped with non-magnetic stainless steel belt. Where the metal sheath is specifically required to not be exposed, a low-smoke, halogen-free sheath can be added to the outside.
Basic product parameters:
Conductor: The conductor is a round copper stranded wire.
Insulation: mineral oxygen barrier, then extruded synthetic mineral insulating material
Filling layer: The synthetic mineral belt is covered with a mineral compound.
Sheath: Spiral wrapped with non-magnetic stainless steel belt.
Use: This product is the first in China, and there is no prototype in the world. Compared with the BTTZ series of metal outer sheathed cables, the product maintains ultra-high fire resistance and electrical resistance. It can achieve continuous large length and multi-core cable within 120 mm, which overcomes the shortcomings of too many joints, and stainless steel The mechanical properties and environmental corrosion resistance of the outer sheath are greatly improved.
Special cables
Features: Flexible synthetic mineral insulated fireproof cable adopts a flexible structure to make up for the defects of hard structure, flammability, and toxicity. It also has some advantages that other cables cannot have, such as: fire resistance, large current carrying capacity, and impact voltage resistance , Mechanical damage resistance, halogen-free, non-toxic, explosion-proof, waterproof, anti-rat bite, corrosion resistance, long life, safety, overload resistance, high temperature resistance, heat insulation and low comprehensive cost characteristics, flexible synthetic mineral insulated fireproof cable HFTGB( Y) The process structure of the product is exactly the same as that of the traditional cable. It successfully solves the many shortcomings of the product determined by the production process of the magnesium oxide mineral insulated cable (BTTZ). At the same time, the power and the communication fireproof cable are integrated, so that in the event of a fire Keep communication information unblocked.
product description:
HFTGB cable is the first in China, and there is no prototype in the world. Compared with the BTTZ series of metal outer sheathed cables, the product maintains ultra-high fire resistance and electrical resistance performance. It can achieve continuous large length and multi-core cable within 120mm2, which overcomes the shortcomings of too many joints, and The mechanical properties and environmental corrosion resistance of the stainless steel outer sheath are greatly improved. However, the structure of this product is also complicated, the conductive performance of the stainless steel outer sheath is weak, and it cannot replace the grounding wire like a copper sheath. The overall cost is relatively high among the major categories of mineral cables.

Product performance standards:
1. BS 6387:1994 performance requirements for cables to maintain circuit integrity under flame conditions;
2. Follow the corresponding corporate standards.
Product characteristics:
Voltage level: 0.6/1kV, working voltage is 500V for light load and 1000V for heavy load.
Working environment: The long-term working temperature is 70°C for the sheath; the long-term working temperature of the mineral insulated cable is 105°C where no one can touch it.
1. Installation conditions: It is suitable for the open laying of the ladder frame, and the installation methods such as bridge frame, pipe-through, and burying can also be adopted;
2. Installation process: there are special connectors, please refer to the manufacturer’s “installation instruction manual” for details;
3. Matters needing attention: The bending of the stainless steel metal sheath must be carried out in a reliable way. A single single-core cable is not suitable for laying directly through a metal pipe.

Advantages of BTTZ rigid mineral insulated cable

Due to the special structure of BTTZ rigid mineral insulated cables, it has some characteristics different from traditional cables; it is also the most superior fire resistance characteristic of mineral insulated cables.
Advantages of BTTZ rigid mineral insulated cable
1) Completely fireproof BTTZ cable itself does not burn at all, and it will not cause a fire source at the same time. Even in the case of flame barbecue, as long as the flame temperature is lower than the melting point of copper, the cable can be used without replacement after the flame is eliminated. In the case of being grilled by flames, no toxic smoke and gas will be produced.

2) Strong overload protection capability When the line is overloaded, the cable will not be damaged as long as the heat does not reach the melting point of copper. Even if the breakdown occurs instantaneously, the magnesium oxide crystal at the breakdown will not form carbides. After the overload is eliminated, the cable performance will not change, and normal use can still be continued.
3) High working temperature Since the melting point of the insulating layer of magnesium oxide crystal is much higher than the melting point of copper, the maximum normal working temperature of the cable can reach 250°C, and it can continue to operate at a temperature close to the melting point of copper of 1083°C in the short term.
4) Good anti-corrosion and explosion-proof performance. As the seamless copper tube is used as the sheath, the BTTZ cable has the performance of waterproof, moisture, oil and some chemical substances. The copper tube has considerable mechanical strength, so it has better explosion-proof performance.

5) Long service life BTTZ cables are all made of inorganic materials, so there is no insulation aging, and the service life can reach more than 3 times that of ordinary cables.
6) Greater flexibility in laying BTTZ cables can be laid on the bridge with ordinary cables, and can also be laid with special brackets, which is more flexible than ordinary cable laying. It also saves the investment in cable bridges and reduces the overall cost of the project.