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How to make suitable for wire and cable market in Europe and the United States?

Source:Weihang electric (Shenzhen) Co., Ltd. Browse:833times Upload Date:2013/7/30

 How to make suitable for wire and cable market in Europe and the United States?
Wire and cable manufacturers in expanding the global market, are facing a difficult challenge, is also in line with the requirements of the national standard of different market. Even with a linear, manufacturers often also because of different national requirements, the production of wire and various models. These wires before marketing, must be through a number of testing and certification, and the testing and certification, sometimes need to be carried out in laboratories all over the world and authentication mechanism.
2 safety regulations
In general, there are two main security system for wire and cable products:
IEC standard is applicable to the global market of international standards, most of the countries are involved in CB system uses the IEC standard, but additional national differences. For example: the European electrical standards committee (CENELEC) in the sales territory of members of the wire and cable products, are required to comply with CENELEC HD (Harmonization Document) specification, and the specification is the national differences in IEC standard. The most commonly used IEC cable standard is IEC 60227 and IEC 60245, corresponding to the CENELEC HD specification is HD 21 and HD 22.
• UL standard in the International Electrotechnical Commission (IECEE) to IEC standards for wire and cable products, UL has developed the electric wire and cable products a series of criteria for the American market, and a considerable number of Canadian Standards is to coordinate with the UL standard. The most commonly used UL cable standard is UL 62 and UL 758.
3 can be combined with wire line multinational market requirements
Although UL and IEC electric wire & cable standard is two different systems, including systems of measurement wire structure and the conductor size (the American wire gauge and Metric) are not the same, but some wire line in fine-tuning, can also meet the two criteria.
4 IEC 60227 and CENELEC HD 21 specification
Whether based on UL or IEC standard, evaluation of wire and cable products, is to determine the product's electrical properties, mechanical properties and flammability were in accordance with the requirements of. The following is the testing items of IEC 60227 and HD 21 required.
In fact, the majority of test items are required in UL 62 and UL 758 standard, just using different test methods. The four test the following elaboration, is specific to IEC and HD standard test.
Insulation resistance test of 4.1 long time
Test samples of the wire length is 5m, first remove all coat. Separate the uncoated flat wire cores without. Then the samples of bubbles in the concentration of about 10g/litre salt (sodium chloride), the solution is heated to the specified temperature. Samples at both ends of a 0.25m long core line reservations over water. Samples of the conductor connected to the cathode, and soak in the solution of copper electrode is connected to the cathode, with 220V D.C. voltage between the conductor and the copper electrode.
Acceptance criteria: the test after the end of insulating material shall not be damaged, the outer layer.
4.2 thermal stability test
From the insulating material or by collecting three sliver-shaped sample cores, each weight 50 ± 5mg. Put the sample into the glass tube bottom, sample can not be stretched over the bottom of the tube meter height position 30mm.
The general drying paper placed on the test tube, test paper and fixed position. Then put the tube in the preheated to a specific test the temperature of the heater, heater tube should be in the 60mm position. Measurement of universal test paper 5 turn color to pH 3 the time required from the pH value; such as paper no color change, continue to test to the scheduled end time.
Acceptance criteria: the average thermal stability time three samples may be shorter than the standard for the linear the prescribed time.
4.3 low temperature impact test
The test instrument and the test specimen shall be and emission in the refrigerator, and maintain not less than 16 hours at a specified temperature cold storage, including testing instrument by cooling to room temperature to the desired temperature time. In a specified time after the sample turns, put impact on the tester, 100mm hammer should fall.
Insulating materials non-sheathed cable or wire detection before, must first be samples back to room temperature. The first winding core sample straightened 360mm to 100mm long, and then check the insulating material.
By the detection of cables and wires before, must first be sample recovery at room temperature, and then soak in hot water, along the wire axis direction after cutting away by. Check inside and outside the outer layer of insulating material.
Acceptance criteria: on the premise of not a magnifying glass, with the naked eye is not found in three samples of any rupture. If there is only one sample rupture, the need to collect three samples redo this test, if still fails to pass, will be considered unqualified.
The 4.4 flexible test
The 5m soft wire sample straightening frame in the pulley flexible testing instrument, sample to be completely flat on the pulley. Both ends tied weights. Test instrument with stable speed of about 0.33m/s before and after the transitional 1m (IEC standard 30000 one-way movement, the requirements of HD 60000 one-way mobile). The current and voltage required to connect both ends of the conductor samples.
Required to complete the cycle, core line by HD standard voltage test prescribed, complete cable to voltage test by IEC standard prescribed.
Acceptance criteria: voltage test, there shall be no damage to sample.
4.5 technical support
The production line of UL 62 and UL 758 manufacturers, no need to spend a lot of time to design products, can put the product market is extended to the outside of North america. UL can be used as your technical support backing, differences to help you understand how the UL and IEC standards. We can also arrange the technical meeting, with your engineering staff to investigate UL approval prior to wire to which the adjustment, can meet the IEC standard and the European market.


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