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How to distinguish true and false mineral insulated fireproof cables
How to distinguish true and false mineral insulated fireproof cables
is a key facility equipment for fire fighting and rescue of fire fighting equipment. It cannot be stopped operating. Therefore, a dedicated power supply line should be used, and the power supply line must be very reliable and cannot be interrupted due to external factors. The GB 50016-2014 "Code for Fire Protection Design of Buildings" jointly issued by the Ministry of Housing and Urban-Rural Development of the People’s Republic of China and the General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China clearly stipulates that fire-fighting power distribution lines should meet the requirements of continuous power supply during a fire, and should be within the specified range Use mineral insulated fireproof cables.
There are probably the following types of mineral insulated cables currently used in the domestic market
One, BTTZ copper core copper sheathed magnesium oxide insulated fireproof cable
is a rigid cable with a seamless copper tube sheath on the outer layer, magnesium oxide crystal powder filled in the middle, and a single-strand copper rod as the conductor (with poor bending performance). BTTZ is a rigid mineral insulated cable with a limited length that can be produced. In actual use, it must be spliced by several or even dozens of short cables with numerous joints.
二、YTTW copper core copper interlocking armored mineral cable
is composed of copper stranded wire, mineral compound insulation and special non-combustible copper interlocking armored sheath.
3. BTLY aluminum sheath continuous extruded mineral insulated cable
Fireproof cable
However, the market is also flooded with a large number of low-quality products. The editor of the above picture recently discovered a suspected fake YTTW mineral cable at a construction site. The product certificate and the cable are clearly printed with the word YTTW, but regardless of appearance, structure, cross-section, The materials are different from the familiar YTTW mineral cables. The quality of mineral cables is uneven. How should consumers judge the fire performance of mineral cables? Without a professional combustion laboratory, the editor has learned through relevant professional electrical engineers that the most basic It depends on whether there is a BS6387 standard test report for mineral cables from a third-party authority, (CWZ) "Cable Performance Requirements for Keeping Circuits Intact in Fire Conditions":
⑴: Continuously energize for 180 minutes without breakdown under a flame of 950°C (item C is purely fire-resistant);
⑵: After 15 minutes under the flame of 650°C, it will not be penetrated after 15 minutes of water spraying (item W spray test);
⑶: Under 950°C flame, withstand 15 minutes of percussion vibration without breakdown (Z impact test).
Next, look at whether the manufacturer has its own core technology and patents, and whether it has its own combustion performance test laboratory for comprehensive consideration. So it seems that it is particularly important to choose a well-known big brand cable manufacturer, and it is relatively straightforward and simple to obtain high-quality mineral cable products. Ober Electric specializes in the production of mineral cables, and gives you the most assured quality assurance.
Common cable model and cable model meaning representation method and cable specification encyclopedia (collection)
Cable model
Mailan original, stealing must be investigated!
Abstract: Because electrical engineering drawings need to mark the cable model meters and meters on the design drawings, the cable model specifications are abbreviated in a limited space and can represent all meanings; the following will introduce the meaning and representation method of the cable model, and the cable model Encyclopedia of selection and cable specifications.
One, the meaning of the cable model
The meaning of the cable model is mainly composed of five parts: category + conductor + insulation + inner sheath + characteristics, some of which can be omitted and not written out. For example, the type of power cable does not need to be expressed, and the conductor T copper wire does not need to be written out. And so on, you should refer to the corresponding cable model to find out the rules and it is easy to identify.
Cable model meaning
Two. Cable model representation method and law
In addition to the English letters, the cable model also adds numbers: For example, YJV23 cable model, YJ is XLPE insulation, V PVC inner sheath, 2 means double steel tape armor, 3 means outer sheath is polyethylene . That is to say, the number at the back of the cable model indicates the armored cable, and the steel tape armor protects the inside of the cable. Generally, most of the armored cables are buried in the ground.
Cable model representation method
The meaning of the cable model: characteristics + English letters of the cable + with or without armor-rated voltage-number of cores + cross-sectional area, for example: ZR-YJV22-0.6/1kv-3*150+1*95, which means flame-retardant cross-linked polymer Ethylene insulated and PVC sheathed copper core power cable with a rated voltage of 0.6/1kv, composed of three copper cores of 150mm2 and one copper core of 95mm2 into a 4-core cable.
Cable models generally indicate characteristics:
Y—prefabricated type, generally omitted, or polyolefin sheath;
FD—Product category code, refers to branch cables. The Ministry of Construction standards to be promulgated are denoted by FZ, which are essentially the same;
ZR—flame-retardant type NH—fire-resistant type WDZ—halogen-free low-smoke flame-retardant type WDN—halogen-free low-smoke flame-retardant type;
Three, common cable model specifications
1, VV cable model
VV cable model
2, YJV cable model
YJV cable model
3, other wire and cable models
Wire and cable model
What is mineral insulated cable? Overview of mineral insulated cables
Mineral insulated cable is also called Mi cable. In the standard GB 50016-2014 jointly issued by China's housing, urban and rural areas and China's General Administration of quality supervision, inspection and Quarantine on May 1, 2015, page 377 clearly stipulates that mineral insulated non combustible cable is composed of copper core, mineral insulating material, copper and other metal sheath. Application characteristics of power cable and control cable
Wire and cable industry in China has become second only to the automotive industry. In the domestic market share has reached 90%, and in the world, China's total production of wires and cables has exceeded the United States. At present, China has become a big producer of wires and cables. With the rapid development of cable, the number of enterprises is increasing. Due to the good development of China, all countries in the world have focused on the Chinese market. Since the implementation of reform and opening up, the huge power of Chinese people has shocked the world in just a few decades. Let the world have a new view on China. Page up123Page down