Flexible Mineral Insulated Fire-proof Cable
Product Name: Flexible Mineral Insulated Fireproof Cable
Model specification: (1 core, 2 core, 3 core, 4 core, 5 core, 3 + 1 core, 3 + 2 core, 4 + 1 core)
1. Product Standards
Flexible mineral insulated fireproof cables are manufactured according to the following standards:
|Insulation level and voltage withstand level of cable||12706||60502|
|Combustion test and mechanical test||6027|
|Flame Spread Test||18380.3||60332-3||472|
|Flue gas divergence test||17651.2||61034 2||472|
|Circuit Integrity Test Halogen Content Test||12666.6||60331||472||6387|
|Combustion Test of Electrical Cable System||17650.2||60754-2||472|
The relevant norms and regulations promulgated by China are as follows:
Code for Fire Protection of High-rise Civil Architectural Design [GB50045-95 (2005 edition)]
Beijing Code for Fire Protection Design of Electric Cables and Wires for Civil Buildings [DGJ08-93-2002]
Code for Fire Protection in Architectural Design [GB50016-2006]
China Fire Manual (2007 Edition)
Code for Design of Automatic Fire Alarm System [GB50116-98]
Code for Fire Protection Design of Wires and Cables in Civil Buildings [DGJ08-93-2002]
Beijing Fire Bureau Document [Beijing Xiaofa 12004) 352]
Code for Design of Electric Power Cables [GB 5027-94]
Code for Fire Protection Design of Garage, Repair Garage and Parking lot [GB 50067-97]
The design parameters of flexible mineral insulated fire-proof cables are strictly in accordance with the British BS6387 standard and the International Electrotechnical Commission EC standard. These technical parameters have passed the special tests of the State Fire Administration and the National Fire Protection Building Materials Quality Supervision and Inspection Center respectively.
Since all fire-proof cables are made up of inorganic substances (copper and magnesium oxide powder), they will not cause fire and can not be burned or ignited. Because the melting point of copper is 1083 C and the melting point of magnesium oxide is 2800 C, this kind of cable can keep power supply in the case of fire near the melting point of copper, which is a real meaning. Fire-proof cable on.
2. Cable Structural Diagram
The conductor is a circular copper strand, and the insulating layer is pure phlogopite tape (no longer compounded with extruded insulating material, which eliminates the generation of carbon particles and improves the electrical stability).
Aluminum Sheath Isolation Layer (Used for Grounding)
Isolation sleeve (covered with flame-free, inflammable, expandable and flame-retardant inorganic material-Mg(OH) or AL(OH)).
|Location name||Composition||Location name||Composition|
|1、conductor||Copper strand||4、Fill||Mineral Compounds|
|2、||Insulating layer||Mica band + chromophore||5、Metal sleeve||Aluminum sleeve isolation layer|
|3、||6、Outer sheath||Mineral Compounds|
3. Main Performance
One of the main differences between btly flexible mineral insulated fire-proof cable and other ordinary cables is that the high-energy electron beam (β - ray) produced by high-power electron accelerator is used in the production to cross link the inorganic compounds with special formula, so that the cable can not only withstand the working temperature up to 250 ℃, but also keep soft. At the same time, the fire protection performance is greatly improved. It can withstand 950 C and 3 hours of combustion under 1000V load, and has the functions of spray resistance and mechanical impact resistance.
(1) Comparisons with flame-retardant and halogen-free low smoke refractory cables:
Technical performance comparison:
Core Advantages: Not afraid of fire, not to become a source of fire, not to spread the fire-a real [short-circuit combustion, short-circuit combustion]
Fire protection characteristics: BTLY cable strictly abides by BS6387 standard in UK. When a fire breaks out, it can guarantee at least three hours of precious time for necessary personnel and property rescue.
Non-disaster source: BTLY cable has strong overload protection ability and good resistance to the impact of large current. Even when the load changes or the line is short-circuited, it will not cause cable fire like ordinary cable, and will not cause combustion and extension disasters.
Flame Retardant Property: The main material of BTLY cable (inorganic or inorganic compound) determines the non-flammability of cable body, so it does not spread fire and fire.
High current carrying value: BTTW cable can reduce 1-2 sectional grades compared with ordinary, flame-retardant and fire-resistant cables by transmitting the same current.
High voltage withstanding grade: BTLY heavy cable withstands 1000 volts, higher than rigid mineral insulated cable.
Explosion-proof characteristics: BTLY cable can be manufactured in fixed length without intermediate joints. It can prevent flammable oil vapor, flammable gas and flame from entering the electrical equipment connected with the cable through the cable and play an explosion-proof role.
Insulation: BTLY cable has the characteristics of constant shape above short circuit temperature, fire resistance, uninterrupted circuit for three hours in fire, enhanced mechanical properties, enhanced chemical resistance, etc., so its insulation performance is higher.
High temperature adaptability: The working temperature of ordinary cables is generally 70-90 C, while BTLY cables can work for a long time at the ambient temperature of 125 C, so they can work normally in some environments with specific requirements.
Waterproof characteristics: BTLY cable still has good water spray resistance under fire conditions.
High mechanical strength: BTLY cable through high-energy beta-ray, the product has good mechanical impact resistance.
Environmental protection characteristics: BTLY cable may produce a small amount of water vapor similar to smoke under fire conditions, but it is harmless to the environment. It completely overcomes the "disaster" and "secondary disaster" caused by smoke and toxicity of ordinary plastic cable in flame combustion.
Energy-saving characteristics: With the same cross-section area, the reactive power loss of the cable will be greatly reduced, and long-term use will reduce a large amount of energy waste.
Easy to install: BTLY cable is suitable for various laying methods, and the structure is flexible, easy to bend, no joints in the middle, no special terminal, so there is no accessories, so ordinary electrical personnel can lay according to the conventional method.
Direct price: BTLY cable can reduce 1-2 section grades in practical use due to the increase of interception flow.
Indirect price: BTLY cable without special installation can reduce the requirements of sealed and fireproof bridges, and the cost will be reduced accordingly. At the same time, due to the reduction of reactive power loss, it can further reduce operating costs.
(2) ratio with rigid (hard) mineral insulated fireproof cable
BTLY not only has the advantages of fire-proof, explosion-proof, temperature-proof and large carrying capacity of hard cables, but also overcomes many shortcomings of rigid mineral insulated fire-proof cables and greatly improves their performance.
The insulation stability is improved: BTLY cable not only retains the fire resistance of rigid mineral insulated cable, but also has the characteristics of unsuitable moisture absorption, so the insulation performance is more stable.
Increased voltage withstand level: BTLY cable withstand voltage level can reach 1000V, which reduces many impulse voltage caused by frequent start-up of inductor and frequency converter, accordingly, the service life of line system is greatly improved.
Full Series: BTLY cable can be processed into single core or multi-core structure according to the actual needs of users, up to 96 cores can be achieved, almost covering all kinds of specifications of construction cables such as power cables and control cables.
No Intermediate Connector: BTLY cable adopts mature stranding and cable-forming technology. It can be manufactured at fixed length according to user's requirements, which not only reduces the cost of joints, but also improves and realizes the flexibility of the whole line.
Easy to install: BTLY cable is more flexible due to the use of traditional cable structures such as ribs and cables. At the same time, it is more convenient to install and lay because it does not need special terminal connectors.
Space saving: BTLY cable can provide multi-core cables with large cross-section and length, thus avoiding unnecessary laying space caused by multiple arrays and intermediate heads.
Public welfare: BTLY cable, due to structural improvement, uses a large number of minerals or mineral compounds, which not only saves copper resources, but also consequently saves a large amount of energy consumption, public welfare value is also very significant.
Flexible Mineral Insulated Fire Cable (BTLY) plays an important role in protecting lives, materials and information security. It is used in trunk lines, fire lines and escape rescue systems, such as emergency lighting, alarm system, elevator system, smoke exhaust system and control lines.
Public buildings: high-rise buildings, underground buildings, hotels, hospitals, schools, business centers, government centers, Department stores, supermarkets, logistics warehouses, banks, securities and insurance and other financial institutions, post and telecommunication centers, power control rooms, substation rooms, museums, memorials and other historic buildings.
Infrastructure: Airport terminal, station, hub, port, subway system, bridge, tunnel.
Industrial fields: coal mining, coal chemical industry, oil field exploitation, petrochemical industry, refinery, gold industry, steel industry, shipbuilding industry, aerospace, power industry, pharmaceutical industry, glass industry, paper industry, military system.
Fire-proof, explosion-proof, high temperature places: oil depots and gas stations, natural gas transmission and compression stations, landscape, scenic spots and historic sites, wooden structures.
5. Requirements for Use
(1) When the cable is laid open, support such as cable bracket, hook or metal suspension rope shall be used along the whole length. The maximum span shall comply with the following provisions:
It satisfies the load-carrying capacity of the supporting parts and the outer layer of the lossless cable and its core.
The cables can be arranged neatly with each other.
To meet the layout requirements under working conditions.
Ordinary bracket (arm bracket) for direct support cable. The allowable span of suspension bracket should conform to the values specified in the table below.
Fixture, tie-up, tie-up rope or supporting parts for fixed cable should have smooth surface, easy installation, sufficient mechanical strength and durability suitable for use environment.
Permissible span (mm) of common bracket and hanger
|External diameter of cable characteristic cable||Laying method|
Note: This value can be doubled if the cable is kept flat.
(2) The selection of components for cable fixing shall comply with the following provisions:
In addition to AC single-phase power cable, anti-corrosion flat steel fixture, nylon tie and plastic-plated metal tie can be used. Nylon banding or plastic-plated metal banding should be used in strong corrosive environment.
For the rigid fixation of AC single-phase power cable, it is better to use aluminum alloy and other clamps that do not form magnetic closed circuit. Other fixation methods can be nylon ties or ropes.
Cables shall not be directly tied with wire.
When located near the electric railway with direct current traction, insulating pads should be installed between the cable and the support.
(1) The bracket shall comply with the following requirements:
The surface is smooth and without burrs.
Durable and stable for use.
To meet the required carrying capacity.
It meets the engineering fire protection requirements.
(2) In addition to supporting AC system cables with single working current greater than 1000A, steel brackets should be used. In strong corrosive environment, the selection of cable brackets of other materials shall comply with the following requirements:
Ordinary bracket (arm bracket) in cable trench can be made of corrosion resistant rigid material.
The ladder and tray of cable bridge can be made of FRP which meets the engineering conditions and is non-flammable.
When the technology and economy are better, the cable tray made of aluminium alloy can be used.
(3) The metal cable bracket shall be treated with anticorrosion and shall comply with the following provisions:
For steel cable bridges with dense configurations such as large-capacity power plants or important circuits, proper anti-corrosion treatment methods should be selected according to the durability of disposable anti-corrosion treatment and the requirements of engineering environment and durability.
In strong corrosive environment, steel arm brackets with high durability, such as hot-dip galvanizing, and cable bridges with light corrosive environment or non-important circuit can be treated with paint.
(4) The strength of the cable bracket shall meet the loading and installation and maintenance requirements of the cable and its accessories, and shall comply with the following provisions:
When it is possible to be temporary, the additional centralized load of 900N is used.
In mechanized construction, the effects of longitudinal tension, lateral thrust and pulley weight are taken into account.
When outdoors, the additional loads of possible re-icing, snow and large grids are taken into account.
The structure of cable bridge should meet the requirements of strength, stiffness and stability.
(5) The selection of cable brackets shall comply with the following provisions:
When the number of open-laid cables is more, or the spanning distance of cables is larger, or the cable needs snake-like installation, the cable bridge should be used.
The bending radius of cable laying should not be less than 15 times of the cable outer diameter.
Pipe piercing requirements
(1) When cable needs to be laid through pipes, pipes should be selected according to the inner diameter of pipes 1.5 times larger than the outer diameter of cables.
(2) Requirements for pipes: Fire-proof signs should be provided at the pipes.
(3) Steel pipes should not wear single-core cables (including branch cables).
(4) Plastic pipes should be halogen-free flame retardant.
(1) In principle, joints are not used or used less, and construction length requirements (i.e. delivery length) are specified to the manufacturer when purchasing.
(2) if necessary. It should be guaranteed to burn at nearly 1000 C. It can supply power normally for 3 hours.
(3) When joining. The effective cross section of the same core must be achieved at the junction of conductors.
(4) Single-core cables with specifications of 10mm2 or less can be connected by connectors with ceramic sleeves. Single-core cables with specifications of more than 10 mm2 shall be jointed by pressing copper nose and connected with each other by copper screw.
(5) Insulation shall be separated by porcelain bushing, which shall be fixed.