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What requirements need to be considered when designing wiring terminals

Release time:2023-05-29　

Terminal blocks are very versatile, so more consideration should be given when designing them. For example, in the power industry, the requirements for terminal blocks include: the edges and corners of the product casing, burrs in hardware, the connection strength of various components, and even the stability of the product under conditions such as motion.

The protection requirements for the terminal housing are mainly based on the provisions of JB/T 9568-2000 on the protection level, which are mainly divided into two types: one is the protection level for solid foreign objects, and the other is the harm caused by water to equipment and products. At the same time, regarding the insulation coordination of wiring terminals, it is often necessary to consider material selection, working voltage, and environmental pollution level to determine the electrical gap and creepage distance, in order to protect the safety of workers and product work.

At the same time, it also ensures that the product will not suffer insulation damage under overvoltage; In addition, it is also necessary to consider the requirement of leakage marking index. During the use of the product, the surface of the solid insulation material forms a conductive path under the action of an electric field and electrolyte, which reduces the insulation performance of the shell insulation material and affects the safety of the product.

We also need to consider the deformation of the material, as thermoplastic materials mainly affect the temperature rise and contact resistance of the terminal blocks during operation. The high temperature it causes causes causes the shell to deform and soften, resulting in electrical short circuits and serious accidents. Therefore, the selection of materials for the current carrying components of the terminal blocks is very important.

When designing the structure of terminals, the operating components should not be electrified, and the wiring terminals connected internally should not be accessible. This is mainly a requirement for the reliability of screw torque, and it should be prevented from accidentally loosening and shortening the screws and wires of accessible terminals