380V mining low-voltage flame-retardant cable MY-3 * 35+1 * 16M2

380V mining low-voltage flame-retardant cable MY-3 * 35+1 * 16M2

Execution standard: MT818.5-1999
Purpose: This product is a series of mining rubber sheathed flexible cables
Suitable for connecting power lines to mobile coal mining units and other equipment with rated voltage of 0.66/1.14KV and below.
Working conditions:
The rated voltage Uo/U is 0.38/0.66 and 0.66/1.14KV
The long-term operating temperature of cable conductors is 65 ℃
The small bending radius of the cable is 6 times the diameter of the cable
Model name and purpose
MY-0.38/0.66 Mobile rubber sheathed flexible cable for coal mines
Power connection of various underground mobile coal mining equipment with rated voltage of 0.38/0.66KV
MYE-0.38/0.66 Mobile Elastic Flexible Cable for Coal Mines
Power connection of various underground mobile coal mining equipment with rated voltage of 0.38/0.66KV
MYP-0.38/0.66 Mobile Shielded Rubber Jacketed Flexible Cable for Coal Mines
Power connection of various underground mobile coal mining equipment with rated voltage of 0.38/0.66KV
MYPE-0.38/0.66 Mobile Shielded Elastic Flexible Cable for Coal Mines
Power connection of various underground mobile coal mining equipment with rated voltage of 0.38/0.66KV
MYP-0.66/1.14 Mobile shielded rubber sheathed flexible cable for coal mines
Power connection for various underground mobile coal mining equipment with a rated voltage of 0.66/1.44KV
MYPE-0.66/1.14 Mobile Shielded Elastic Flexible Cable for Coal Mines
Power connection for various underground mobile coal mining equipment with a rated voltage of 0.66/1.44KV
Other requirements and test methods shall be executed in accordance with the MT818.5-1999 standard
The insulation resistance between the main cores of cable insulation and between the main cores and the ground wire shall not be less than 100M Ω· km when converted to+20 ℃.
The transition resistance of the main core shielding layer shall not exceed 3k Ω when converted to 20 ℃.
380V mining low-voltage flame-retardant cable MY-3 * 35+1 * 16M2Product standard: MT818.5-1999.
The MYP cable consists of three main cores with insulation shielding and a ground wire wrapped in a semi conductive rubber layer, which is twisted around the semi conductive rubber layer to form a cable.
It is recommended by the manufacturer to use a black chlorinated polyethylene rubber sheath or a thick black chloroprene rubber sheath extruded outside for greater safety.
Conductive core: Made of soft copper wire, its performance complies with GB/T3956-1997.
Insulation: XJ-00A rubber according to GB7594.2-1987 is used.
Core identification: Insulation color separation identification is used, with the main core being red, green, and white.
Ground wire: covered with a semi conductive rubber.
Insulation shielding: Cover the insulation surface with a semi conductive tape.
Cabling: Three main cores and one ground wire are twisted in the right direction around a semi conductive rubber pad core to form a cable.
Sheath: XH-03A rubber according to GB7594.7-1987 is used. The oxygen index of the sheath rubber is ≥ 40.
The flame retardant performance of the finished cable meets the requirements of MT386-1995.
Cable marking: The surface of the cable is printed with the model, voltage, specifications, and manufacturer.

The concept of insulation: Insulation refers to the use of insulating substances and materials to enclose and seal a charged body, in order to isolate the charged body or conductors with different potentials and allow current to flow through a certain path. Insulating rubber must have good dielectric properties, high insulation resistance and withstand voltage strength, excellent physical and mechanical properties, and a certain degree of plasticity for easy processing and flexibility for easy installation and use. The early selection of insulation materials for rubber sheathed cables included natural rubber (NR), styrene butadiene rubber (SBR), and ethylene propylene diene monomer (EPR or EPDM). However, due to the new standard requiring insulation materials to pass air burst testing, companies now mostly use pure EPDM rubber or materials made by combining chlorinated polyethylene (CPE) with EPDM rubber to meet the requirements of the standard.

Transportation and storage of wires and cables
1、 High quality copper cables use high-purity oxygen free copper, with bright copper cores and dull copper wire surfaces.
2、 Plastic is made of high-quality virgin plastic with good bending performance. It does not produce any texture when bending cables. Poor recycled plastic will show obvious texture after bending several times, and may break after multiple bends
3、 It may be more difficult to detect the movement of foot meters in meters, as customers generally do not have equipment to actually measure meters. The same weighing method can be used to determine whether the cable is foot meters. Alternatively, printing rice labels during factory production is also a good method, but it should be noted that lines with a diameter less than 5mm cannot be printed with rice labels
4、 Foot copper is a precious metal, and if there is a slight decrease in copper diameter, it can reduce a significant amount of raw material costs. In this case, a micrometer is needed to measure the diameter of the copper wire. If there is no micrometer, a simpler method is to weigh the entire coil of wire and see if it is much lighter than high-quality cables. Alternatively, you can refer to the nominal weight provided by the factory. Some factories give lower nominal weights, which naturally cannot guarantee product quality.
5、 In order to ensure the roundness of the cable, auxiliary materials will be added to the cores of multi-core cables, and the thickness of the sheath will be relatively thick. If the cable in hand is not round, it indicates that the filler is added very little and the sheath is made thin.
6、 During production, multiple strands of copper wire are bundled to improve the tensile strength, roundness, electrical performance, and tightness with the insulation layer of the copper core. However, because bundling increases the amount of copper used, many factories omit this step. The distinguishing method is to cut open the core wire of the cable and see if the copper wires inside are twisted together in a regular pattern.
7、 Braiding cables with copper mesh weaving layers accounts for a significant portion of the cable material cost, and the coverage of the weaving layer directly affects the electrical performance of the cable. At the same time, a tightly woven layer can increase the strength of the cable and reduce the decline in electrical performance of the cable in a bent state. So looking at whether the weaving layer has a high coverage rate and whether the weaving is uniform and fine is an important means to distinguish between good and bad wires and cables.
8、 Some cables require foaming of the insulation layer to enhance their electrical performance. Foaming mainly includes chemical foaming and physical foaming. Chemical foaming does not require special production equipment, so the price is low. However, the size of the bubbles produced varies, and the electrical performance is poor. Physical foaming requires expensive production equipment, but the bubbles it produces are uniform and fine, with little attenuation when bent, and have good electrical performance. You can cut open such cable cores and observe whether the foam layer has uniform and fine bubbles. (end)