Insulation Material Safety Supplies Introduction ( I )
1, insulated boots, shoes with ordinary boots, shoes, what is the difference?
Insulated boots, heel ordinary boots, shoes are different in design, insulation boots, shoes in the structural design of the insulation rubber material made of the circumference of the insulation to form a closed insulation system to protect the foot. Ordinary boots, shoes are different, ordinary boots, shoes, outsole and sponge is not used insulation, low insulation properties easy to leakage. Some leakage currents up to 30mA current far beyond security, insulated footwear carried out only by electrical performance test, qualified before the factory. Ordinary shoes do not have this requirement.
2, why the insulation protective equipment to keep dry wear?
Insulation protective equipment worn in the dry state is the user must pay attention to the big problem, because the insulation protective equipment if it contains a certain amount of water, so that the insulation volume resistance and surface resistance greatly reduced. Water is a conductor, due to the presence of water, so that the insulating properties of the insulation greatly reduced or even destroyed. Because the water atomic angle ∠HOH = 105 ° has a strong polarity to generate ionic conductivity, and then there is a lot of water in the water under the action of heat, light, electricity can produce chemical changes, and the destruction of insulation properties, so maintaining the insulation protection device can greatly improve the safety performance.
3. What are the most important indicators of the quality of the insulation performance of the insulation protective equipment?
Insulation protective equipment (insulated boots, shoes, gloves, etc.) The purpose of wear is to prevent electric shock damage, which is mainly caused by the body through the current. So the protection of the insulator is good or bad mainly depends on the size of the leakage current through a certain voltage, if Leakage current is safe within the safety current value range, otherwise it is unsafe. If a certain voltage is applied, even though there is no cause breakdown, leakage current is too large, the same cause bodily injury.
4, why should insulating protective equipment carry out preventive tests?
The preventive test is the strict regulation of the power industry to ensure the safety of the human body. There are three protective packages for insulation, which are relatively long. In such a long time, due to changes in aging or storage conditions, it is necessary for users to carry out preventive tests before using. If the shoes are more than three packages, they can also be tested. After being qualified, they can be used.
5. What is the relationship between the test voltage and the maximum range of use?
The insulation protection equipment is tested only under a certain frequency voltage before leaving the factory, for example, the use of 5KV is a line voltage 380V. The test voltage is 13.2 times the safety factor of the use of the voltage, but the conditions and environment are different, and the countries are not the same. The relationship between the test voltage and the maximum use range is determined with the reference of the American empirical formula. Empirical formula recommended by American ASDTMD120-79: maximum voltage = test voltage x 0.95-2000V.