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Which tests are qualified by the cable, you know?
Source: http://www.huazongsj.com Release time: 2017-12-22

What tests are needed for cables?

1. Electrical performance detection.
Mainly include the conductor dc resistance, insulation resistance, voltage test and insulation wire core voltage test, each item is very important, directly reflects the electric cable conductor resistance transmission performance, directly affecting the service life of cable in the power of the temperature, and voltage drop, and safe operation, it mainly examines the conductor material and sectional area, if the material of the conductor is not good or a serious shortage of sectional area, will cause the conductor dc resistance exceeds bid badly, this kind of cable laying in the line will increase by the loss of the current on cable conductor itself caused by fever, cause the insulation aging cracking of coated conductors, power lines caused by leakage, short circuit, and even cause fire, endanger the safety of the person or property.
There are strict rules for the direct current resistance of conductors of different specifications of cables.
, finished product voltage test and insulation resistance between the insulation wire core voltage test, the test of the cable insulation and sheath layer of electrical insulation, insulation resistance testing insulation resistance between the two conductors is, it should be big enough to have insulation protection.
Finished product voltage test and insulation wire core voltage test not only for the insulation of the cable have enough ability, also required thickness of insulation and sheath material evenly without impurities, enough even, the surface can't be invisible trachoma, pinhole, etc., otherwise it will cause partial breakdown pressure test.
2. Mechanical performance detection.
Mainly investigate plastic insulation and sheath material tensile strength, elongation at break, including before and after aging, and for the finished soft cable qu torsion test, bending test, load core test, insulation wire core tear test, static torsion test, etc.
Aging before and after tensile strength, elongation at break before and after aging is the most important cable insulation and sheath material should suit the most basic indicators, requirements for cable insulation and sheath material, should have enough tensile strength is not easy to break, and a certain flexibility.
Aging is refers to under the condition of high temperature, insulation and sheath material should suit's ability to maintain its original performance, aging should not seriously affect the tensile strength and elongation, which will directly affect the service life of the cable, if the tensile strength and elongation at break is unqualified, appear easily during the installation of the cable is sheathed or insulator rupture, or under the environment of light, heat and its sheath insulation is easy to brittle fracture, the charged conductor naked, get an electric shock risk.
Additional soft cable because not fixed installation, use of drag, bend over and over again, and so on and so forth, so for the flexible cable standards and other provisions on its end product and do dynamic curve bending test, bending test, load test, the insulation wire core tear test, static torsion test, etc., to ensure that the cable meet the requirements in actual use.
Such as dynamic qu torsion test mainly examine soft cable under mechanical tensile and bending stress of the outside world, whether soft conductors twisted wire wire fracture and reduce the transmission performance of electricity, or puncture and reduce electrical insulation insulation performance;
Insulation is a test method to affect the electrical insulation performance of cables due to stress.
3. Performance test of insulation and sheath materials.
Including heat loss, thermal shock, high temperature pressure, low temperature bending, low temperature stretch, low temperature impact, flame retardant performance, etc.
These are examining the performance of insulation and sheath material of plastic, such as heat test is inspection after 7 days after the high temperature of 80 ℃ ageing degree of material degradation, volatile;
Thermal shock test at 150 ℃ high temperature after 1 h by the special winding insulation surface trim;
The degree of elasticity of the insulation material after the high temperature is cooled;
All generally refers to the low temperature test - 15 ℃ under the condition of the change of its mechanical properties, is testing cable material in low temperature environment is crisp, easy to crack or easy to snap, etc.
Performance and the flame retardant properties of the cable is very important, examines the performance test for no delay combustion test, namely to according to the standard installation of the finished cable with special flame lit a certain amount of time, after waiting for its self extinguishing fire check the condition of the cable burned, burned away part of as little as possible, of course, its poor combustion and good flame retardancy, the safer.
Iv. Sign inspection.
The standard requires that the cable package should be accompanied by a label or symbol indicating the product model, specification, standard number, name of the factory and the place of origin, including the rated voltage, number of cores and the nominal cross-section of the conductor.
Cable surface should be printed with name of manufacturer, type of product and rated voltage of the continuous mark, symbol spacing requirement 200 mm or less (insulated surface) or 500 mm or less (sheath surface), mark content should be complete, clear, rubbing, this requirement is to facilitate users to understand the specifications of the cable and voltage grade, in case the installation errors.

In addition, the wire insulation wire core should first choose the color standard recommended, in particular is yellow/green double color line, the line generally used in electrical appliances in the power cord, dedicated to the special double color line to ground for yellow/green collocation standard also has the following provisions: namely to each long ~ of two-color insulation wire core, one of the colors should cover at least 30% of the surface of the insulation wire core, and not more than 70%, while another color cover the rest of the insulated wire core, namely the yellow/green double color should be the basic balance.
5. Structural dimension detection.
Including insulation and sheath thickness, thinnest thickness, dimension and so on.
The thickness of insulation and sheath size for voltage cables that can tolerate much strength, and its mechanical performance is good or bad has a very important role, so for the different specifications of cable, the standard has strict rules on thickness, e. requirements shall not be lower than the national standard.
Cable insulation thickness is too thin will seriously affect the use safety of the cable, can cause leakage due to cable breakdown, bare conductors such as security, it certainly isn't as thick as possible, should not affect the installation, so the standard and restrictions on the size requirements to set up a form.
Common certification mark.
1. CCC certification
Compulsory certification is a passport to the domestic market.
2. CB certification
Is conducive to the export products for family, office, workshop, and similar place directly related to the personal safety of electrical products, this kind of product in the part of the national compulsory certification, namely by the country's authentication certificate book, allowed to export to the country, and sells on the market in the country.
Even in countries where there is no compulsory certification, consumers are willing to buy products that are recognized and certified for their own safety.
3. CE certification
It is a pass for products to enter the European Union and the European trade free zone national market.
Products that are certified and have a CE mark will reduce the risk of sales in the European market:
1) the risk of being detained and investigated by the customs;
2) the risk of being investigated by the market supervision organization;
3) the competitor is at risk for the purpose of competition.
4. UL certification
In the U.S. market, consumers and buyers are more willing to buy products with UL certification mark.

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