China Zhenglan Cable Technology Co., Ltd Company News

Among our commonly used power cables, rubber sheathed cables are also one of them. Rubber sheathed cable is a kind of soft and movable cable with multi-strand thin copper wire as conductor, rubber insulation and rubber sheath. Generally speaking, it includes general-purpose rubber-sheathed flexible cables, electric welding machine cables, submersible motor cables, radio device cables, and photographic light source cables. So what are the uses of rubber sheathed cables and what are the selection principles? Here is a brief introduction.   Application of Rubber-sheathed Cables Rubber-sheathed cables are widely used in various electrical equipment, such as household appliances, electric machinery, electrical equipment and portable power cords for appliances, and can be used indoors or outdoors. According to the external mechanical force of the cable, the product structure is divided into three types: light, medium and heavy, and there are appropriate connections in the section. Generally, light-duty rubber-sheathed cables are used in household appliances and small electric equipment, requiring softness, lightness, and good bending performance; medium-duty rubber-sheathed cables are widely used in agricultural electrification except for industrial use, and heavy-duty cables are used in such as port machinery, searchlights, Large-scale hydraulic irrigation and drainage stations for family business and other occasions. This type of product has good versatility, complete series of specifications, good and stable performance.  

MDPE has very high resistance to abrasion and it is extremely hard and has a low dielectric constant with superior oxidation resistance. The hardness of the MDPE cable sheathing protects the cable from sharp objects dropped or loaded onto the cable. This helps MDPE finds particular usage in transmission cables in the toughest of environments, notably those with the high ambient temperatures found in tropical and subtropical countries. But at these high ambient temperatures alternative sheathing materials such as PVC would be soft and prone to damage easily during laying of the cables.   Compared with LDPE (low density polyethylene), MDPE has significantly more strength enabling it to be pulled under heavy load for cabling applications; while compared to HDPE (high density polyethylene), HDPE has improved resistance to cracking.   Besides, various additives can be applied to MDPE compounds to improve fire retardant properties, UV and weathering resistance and the chemical degradation.

First of all, look at the color. The copper core is yellowish and reddish, indicating that the quality of the copper used is better, while the yellowish white is the reaction of low-quality copper. For aluminum core wires, regular ones must be shiny, shining silver-white light under the light, while those that are dark and look dark are of poor quality.   Secondly, bend the wire by hand to test its toughness. A good wire has good toughness and can be bent very well. Some unqualified wires are bent a few times and their insulation layer is broken, and some can even be peeled off by hand. Insulation. Then, it must be checked whether the length and the thickness of the wire core have been tampered with. According to the relevant standards, the error of the length of the wire cannot exceed 5%, and the diameter of the cross-section cannot exceed 0.02%. Short of two catties, the phenomenon of falsification on the cross-section.   Also intercept a section of insulation to see if its core is in the middle of the insulation. What is not centered is the phenomenon of core eccentricity caused by low craftsmanship. When using it, if the power is low, it will be safe. Once the amount is large, the thinner side is likely to be broken down.   Finally, we can also check whether the identification is complete. There should be the name of the cable factory, wire model, specification, cross-sectional area, length, rated voltage, date of manufacture, and the implemented certification number or certification mark. If these signs are incomplete or absent, consumers should be cautious when purchasing. .

UNE 20460-3:1996 standard regulations about the cable usage under dverse environmental conditions, especially to what extent an electrical cable can be exposed to moisture. AD1 grade: The cable can be used in which the walls do not generally show traces of water, but can appear in small periods, for example, in the form of steam and which dries quickly thanks to good ventilation. AD2 grade: cables can be used under situlations in which the water vapour occasionally condenses in the form of water drops or when vapour may occasionally be present. AD3 grade: Water droplets fall at an angle of more than 60º to the vertical, location in which water vapour appears as a continuous film on the walls and/or floors. AD4 grade: Water jets in all directions, locating where the cable may be subject to water projections, for example, application to certain luminaires or cabinets installed outdoors. AD5 grade: Water jets in any direction AD5, locating at where hoses are regularly used in the presence of water (patios, car washes). AD6 grade: used in locations at the edge of the sea, such as beaches, docks, etc. There are possibility of water waves. AD7 grade: Used in locations susceptible to flooding and/or where the water can reach a maximum of 150 mm above the highest point of the equipment, the lowest part of the equipment can be more than one metre below the surface of the water. Shortly, there is possibility of intermittent, partial or total flooding. AD8 grade: Used in locations such as swimming pools, where the electrical equipment is completely covered with water and permanently subjected to a pressure of more than 1 bar. Surrounding environment has the possibility of permanent and total water flooding.

The mechanical protective layer of armored cable can be added to the cable of any structure to increase the mechanical strength of the cable and improve the corrosion resistance. It is designed for the area prone to mechanical damage and corrosion. Armored cables are also divided into steel tape armored cables and steel wire armored cables. The main differences are: 1. Purpose: steel strip armor is only used for laying directly buried cables or ordinary pipes, ordinary ground, tunnels, etc. The thin steel wire armor can withstand the general longitudinal tension, so it is suitable for short distance overhead laying or vertical and vertical laying. In foreign countries, there are many steel wire armored cables! 2. Price: the corresponding steel wire armor is more expensive. Because the production of steel wire armor is difficult and the cost is high. 3. Current-carrying capacity: the difference is not big, but the diamagnetic steel strip or steel wire should be selected. 4. According to the different use environment, different types of armored cables are selected: steel strip armor can withstand mechanical pressure, and steel wire armor can withstand mechanical tension.

Dear customer, Thanks for visiting our website. Thank you for you support all the way through.   Here comes China's Lunar New Year Spring Festival. Kindly note we will be on holiday from January 15th(Sunday) to 27th(Friday).   During holiday, we may have limit access to email and cannot give you quote timely. Kindly ask for your understanding. Once we come back, we will reply you at as quickly as we can.   Happy New Year of Rabbit. Hope you all peace, health and happiness.   Zhenglan Cable Technology Co., Ltd 2023.1.12