【3*35+1*16】The difference between national standard non-standard and cable multi-core and single-core
3*35+1*16 square What does national standard cable mean? Others are 4-core cables, which consist of 3 cross-sectional area 35 square millimeter core wires + 1 cross-sectional area 16 square millimeter core wires. 3-core phase wire, with a cross-sectional area of 35mm² for each core; 1-core neutral wire, with a cross-sectional area of 16mm² for this core conductor. Its diameter plus the insulation on the outside has a total diameter of about 38mm.
3*35 square millimeter + 1*16 square millimeter aluminum core cable, the maximum current carrying capacity of normal room temperature laying is 97.5A, and each core can carry 22KW. Then the three phases and neutral wire of the cable form an three-phase balanced loop, with a maximum of 66KW. If the 3×35+1×16 copper core cable is laid in the air, the continuous current carrying capacity is 140A. P=140*0.38*1.732*0.8=73.71Kw.
cable has different cores and single cores: different conductors, different circuit capacity, and different security.
conductors different
cable multi-core: cable multi-core has multiple conductors in an insulating layer.
Cable single core: The cable single core has only one conductor in one insulating layer.
circuit capacity is different
cable multi-core: in the same section, the rated current carrying capacity of the multi-core cable is greater than the rated current carrying capacity of the single-core cable .
cable single core: in the same section, the rated current carrying capacity of a single core cable is less than the rated current carrying capacity of a multi-core cable.
has different security
cable multi-core: Under the same load or short circuit, the heat generation of the multi-core cable is greater than that of a single-core cable, which is more dangerous to use.
cable single core: Under the same load or short circuit, the heat generation of a single core cable is less than that of a multi-core cable, making it safer to use.
The difference between national standards and non-national standards:
national standards line premium products are 100±0.5 meters/roll, and some non-standard lines are only more than 80-95 meters/roll, which is generally 95 meters. The 95 line refers to this kind of non-standard lines with 95 meters marking 100 meters.
Look at copper-qualified copper core wire copper core should be purple-red, shiny and soft. The copper core of the fake and inferior copper core is purple-black, yellow or white, with many impurities, poor mechanical strength, and poor toughness. It will break if it is used with a little force, and there are often wire breaks in the wire. During inspection, you just peel off one end of the wire 2 cm, and then rub it slightly with a piece of white paper on the copper core. If there is black substance on the white paper, it means that there are more impurities in the copper core. In addition, the insulating layer of counterfeit wires looks very thick, but in fact most of them are made of recycled plastic . Over time, the insulating layer will age and leak electricity.
price-Because the production cost of counterfeit and shoddy wires is low, vendors often sell at low prices under the guise of low prices and good quality when selling them, which makes people fooled.
needs to look at the external - see if there is a quality system certification; see if the certificate of conformity is standardized; see if there is a factory name, factory address, inspection seal, production date; see if there is a trademark, specification, voltage, etc. printed on the wire. It also depends on the cross-section of the wire copper core. The best products are bright in color and soft in color, otherwise they are defective.
: Try it - you can take a wire head to bend it repeatedly with your hands. Anyone with soft feel, good fatigue resistance, strong plastic or rubber feels elastic and no cracks on the wire insulator are excellent products.
Weighting - Wires with good quality are generally within the specified weight range. For example, a commonly used plastic insulated single-strand copper core wire with a cross-sectional area of 1.5 mm2 is 1.8 to 1.9 kg per 100 m; a 2.5 mm2 is 3 to 3.1 kg per 100 m; a 4.0 mm2 is 4.4 to 4.6 kg per 100 m. The weight of poor quality wires is insufficient, either the length is insufficient, or the wire has too many impurities for copper core.
