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BTTRZ fireproof cable

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BTTRZ fireproof cable

  • BTTRZ防火电缆
  • Category: Mineral insulated cables

  • hit count:
  • Release Date: 2018/08/16
  • Online Inquiry
Detailed introduction
Mineral Insulated Cable is referred to as MI cable for short. When it is used as wiring, it is customarily called mineral cable or mineral fireproof cable in China . Mineral insulation non-combustible cable is composed of copper core, mineral insulation material, copper and other metal sheaths. In addition to good electrical conductivity, mechanical and physical properties, and fire resistance, this cable also has good non-combustibility. Under fire conditions, this cable can not only provide fire-fighting power for the duration of the fire, but also not extend the flame and produce no toxic smoke.
  • Chinese name

  • Mineral insulated cable

  • Foreign name

  • Mineral Insulated Cable

  • Short name

  • MI cable

  • Main ingredients

  • Copper core and mineral insulation and metal sheaths such as copper

table of Contents

  1. 产品概述 1 product overview

  2. 发展与现状 ▪Development and status

  3. 分类和区别 Classification and difference

  4. 优点 2 advantages

  5. 产品特性 3 Product Features

  6. 应用领域 4 application areas

product description

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Standard GB 50016-2014 jointly issued by the Housing and Urban-Rural and People's Republic of China Quality Supervision, Inspection and Quarantine, implemented on May 1, 2015 [1] On page 377, it is clearly stipulated that mineral-insulated non-combustible cables are composed of copper cores, mineral insulation materials, and copper metal sheaths.

Development and status

In 1896, MI cables originated in Switzerland, spread to France in 1934, and began to develop in Britain and the United States in 1936. It is widely used due to its excellent fire resistance, including the domestic standard BS6387 for various mineral cables, which is also the British standard used. Up to here, all the cables are said to be rigid. After MI cables were introduced into the country, due to their higher production cost restrictions, there were fewer manufacturers and users in the initial stage until [1] After the implementation of GB / T50016 in 2015, it was explicitly required that MI cables be forced to be used in fire-fighting lines. At this point, MI cables ushered in the spring in China.
The meaning of mineral cable expression The meaning of mineral cable expression
According to the structure can be divided into rigid and flexible two. According to the standard, it can be divided into national standard cables (rigid) and enterprise standard cables (flexible). Only rigid mineral cables have the old standards. As the name implies, it is extremely difficult to bend, and there are great limitations on transportation and installation. Flexible mineral cables have their own standards, and manufacturers have different standards and different quality.
There are only six types of national standard cables: 500V BTTQ, BTTVQ, and WD-BTTYQ, and 750V BTTZ, BTTVZ, and WD-BTTYZ.
The types of flexible cables are named by various manufacturers. Commonly there are more than a dozen types such as BTWTZ, GAN-BTGYZ, BTLY, NG-A and so on.
"JGJ232-2011 Mineral insulated cable laying technical regulations" Article 2.0.1 states: Mineral insulated cables are cables with ordinary annealed copper as conductor, dense magnesium oxide as insulation material, and ordinary annealed copper or copper alloy material as sheath.
Composition of mineral insulated cable structure Composition of mineral insulated cable structure
The domestic basis for detecting mineral cables is the C (simple combustion), W (spray), and Z (impact) tests in BS6387 "Fire Resistance Test Method for Cables to Maintain Integrity of Cables under Flame Conditions"; and GB / T19216. 21 "Line integrity test of cables or optical cables under flame conditions", "GB / T 13033-2007 Mineral insulated cables and terminals with a rated voltage of 750V and below".

Classification and difference

With the exception of national standard cables (rigid), all other flexible mineral cables are standard.
Flexible mineral cable Flexible mineral cable
Relatively speaking, the national standard cable has high technology and complicated and rigorous construction, because the metal sheath itself is extremely difficult to bend, the installation is difficult, and expensive special accessories are required. The fire resistance is also high. BS6387; Similarly, the construction threshold is low, but the fire performance is the same as BS6387. In the application, the matching products are mainly selected according to the fire rating and importance of the building.
Rigid mineral cables cannot be produced for a long time due to process limitations. Special accessories are used for installation, and special tools such as baking guns and bending wheels can be used to achieve (6D). Flexible mineral cables can be continuously produced, and different metal sheath structures have different bending properties. Domestic technologies mainly include copper pipes (rigid), aluminum pipes, cross-welded corrugated copper pipes, and interlocked armored metal sheaths, allowing bending radius In order of decreasing, it is as small as 7D (D is the outer diameter of the cable, and the bending radius of ordinary cables is about 10D). The design and construction should consider the actual site and cable bridge restrictions, and select appropriate products. Generally, the smaller the allowable bending radius, the less difficult it is to install.
The rigid mineral cable itself is relatively hard, and it is also very resistant to impact. Flexible mineral cables are relatively flexible, and the impact resistance depends on the specific structural composition of the corresponding cable. However, all mineral cables except interlocking armored type are difficult to lay through curved pipes, especially large-size cables.

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Keywords: fire-resistant cable , mineral cable

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