Wire and cable need to do what test?

In the purchase of wire and cable, the quality of the cable products is that we need attention, how to get the standard wire and cable it? Wire and cable need to do what test? Here to introduce the common cable test items and testing purposes:

Cable common test items 1, electrical performance testing

Mainly conductor DC resistance, insulation resistance, voltage testing of finished products and insulation core voltage test, each is very important, the conductor resistance directly reflects the electrical transmission performance of the cable, a direct impact on the cable in the power running temperature, life, voltage Drop, and run safety, it mainly examines the conductor material and cross-sectional area, if the conductor material is not good or serious lack of cross-sectional area, it will cause serious DC conductor resistance exceeded, resulting in leakage of power supply lines, short circuit, and even cause a fire, endanger the human body, Property safety. Standards for different specifications of the conductor DC resistance values ?are strict, not greater than the value of the standard.

Cable common test items 2, mechanical testing

Mainly to assess the insulation and sheathing plastic material tensile strength, elongation at break, including before and after aging, as well as for the finished flexible cable flexing test, bending test, load breaking core test, insulated core tear test, Static bending test. Aging before and after the tensile strength, elongation before and after aging is the most important cable insulation and sheathing materials the most basic indicators require the use of cable insulation and sheathing material, it is necessary to have sufficient tensile strength cannot be easily pulled Off, but also have some flexibility.

Cable common test items 3, insulation and sheathing material performance test

Including weight loss, thermal shock, high-temperature pressure, low-temperature bonding, low temperature stretching, low-temperature impact, flame retardant properties and so on. These are the performance e high-temperature ation and sheathing plastic material performance is good or bad, such as weight loss test is to detect after 7 days of high temperature aging 80 ℃ material degradation, volatility; thermal shock test at 150 ℃ high temperature 1h after a special volume Around the insulation surface is cracking; high-temperature pressure test insulating material after high temperature and then cooled its degree of flexibility to maintain; all the low-temperature test generally refers to the -15 ℃ under the conditions of its mechanical properties, are testing cable materials in Cryogenic environment is brittle, easy to crack or easy to pull off and so on.

In addition the flame retardant performance of the cable can be very important to test the performance of the test is non-flammable test, that is, according to the standard installation of finished cable with a special flame lit a certain period of time until its flame extinguished after the check cable Burning, of course, the less burned part of the better, indicating its excellent combustion, flame retardant, the more secure.

Cable common test items 4, flag inspection

The standard requires that the cable package is accompanied by a label or mark indicating the product type, specification, standard number, factory name and place of origin. The specification includes the rated voltage, the number of cores and the nominal cross section of the conductor, etc. The cable surface shall be printed with the name of the manufacturer and the product model And the rated voltage of the continuous mark, mark spacing ≤ 200mm (insulating surface) or ≤ 500mm (jacket surface), unless otherwise specified in the standard, the contents of the flag should be complete, clear, scratch-resistant, this requirement is to facilitate users to understand the cable Model specifications and voltage levels, to prevent the laying of mistakes.

Cable common test items 5, structure size testing

Including insulation and sheath thickness, the thinnest thickness, dimensions and so on. Insulation and sheath thickness for the cable can withstand the strength of the voltage, and its good mechanical properties have a very important role, so for different specifications of the cable, the standard has strict rules on the thickness, the request shall not be lower than the national Standard rating. Cable thickness is too thin will seriously affect the safety of the use of the cable will lead to cable breakdown, conductor leakage caused by leaks and other security risks, of course, is not as thick as possible, should not affect the installation, so the standard set up a form factor Limit this.

Cable What needs to be done? Now we know it, if you still have questions about the purchase of wire and cable, please consult us!