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Armoured cables

National standards for wires and cables

by:AAA     2021-03-05


The home improvement wire is generally single-strand copper core wire, and its cross-sectional area mainly has three specifications, namely 4.0mm2, 2.5mm2 and 1.5mm2. In addition, there are 6.0mm2 specifications, which are mainly used for the main trunk line of the home. They are rarely used or used in home improvement. Generally, they are not included in the scope of home improvement wire specifications.

Cable specification
4.0mm2 single-strand copper core wire is used for circuit main lines and special wires for air conditioners, electric water heaters, etc., 2.5mm2 single-strand copper core wire socket wires and some branch lines, 1.5mm2 single-strand copper core wire is used for lamps and switch wires , The ground wire in the circuit generally also uses a 1.5mm2 single-strand copper core wire.


In addition, telephone lines, TV lines, network cables, audio cables, etc. are also used in home improvement. These lines belong to the scope of dedicated lines. The specifications are relatively uniform, but there are some differences in quality. It is recommended that you choose better quality and higher grades when purchasing. Appropriate.


  The selection of household wire specifications should be calculated according to the total power of household appliances, and then the appropriate wire and cable should be selected according to the maximum current carrying capacity of wires of different specifications.

Cable specification
   Common wire cross-sectional area: 1, 1.5, 2.5, 4, 6, 10, 16, 25, 35, 50, 70, 95, 120, 150, 185, 240mm2


  Unusually used wire cross-sectional area: 0.5, 0.75, 300, 400, 500mm2


  The power cords that can be used at home are generally BVVL×2.5 and BVVL×1.5 type wires. BVVL is the national standard code, meaning it is a single plastic copper wire, 2.5 and 1.5 represent two models of 2.5 square millimeter core and 1.5 square millimeter core respectively. Under normal circumstances, 2.5 type is used as main line, trunk line and electrical socket line, 1.5 type lighting branch line and switch line. It is reasonable to choose 2.5 square millimeter copper core wire for the main line (refrigerator, air conditioner, TV, washing machine, high-power electrical appliances) in the line decoration. It is reasonable to buy a single copper core wire with a section of 1.5 square millimeters for the wire of the lighting lamp. It is necessary to determine the location of the fixed socket on the wall before decorating the cable. It is reasonable to use a socket panel with two or three holes. Note that during construction, the power cord cannot be used for sheathing, but only a single plastic copper wire.

Cable specification
  Before processing, the factory will send samples for inspection, and mass production can be done after confirmation by the construction unit, supervision unit, and project department and sample sealing treatment.


  The error of the cable core diameter is not more than 1% of the nominal diameter. The thickness of the insulating layer and sheath meets the requirements of the specification.


   The appearance of the cable should be intact, no mechanical damage, no obvious wrinkles and twists. The cable sheath and insulation layer are free of aging and cracks.


Cable current carrying capacity, insulation resistance value, service life, safety and environmental performance, product quality stability, cable core cross-sectional area, cable insulation thickness, mechanical strength, fire resistance, high temperature resistance, explosion-proof performance, corrosion resistance, and waterproof performance , Fire-resistant and impact-resistant performance, fire-resistant, impact-resistant and waterproof performance, impact resistance, etc. meet the specifications and design requirements.

Cable specification
   The cable product logo is directly printed on the cable with clear handwriting. Such as model, specification, rated voltage, manufacturer name, length, etc.


   Continuity of the mark: no more than 550mm on the outer sheath of the cable, no more than 275mm on the insulation of the unsheathed cable.


   The head end of each section of cable shall be marked with a length scale starting from zero.


  Through the understanding of the above knowledge, what other issues do you think are worthy of our attention? I hope this knowledge of cable specifications can help you.
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