Views: 0 Author: Site Editor Publish Time: 2022-06-17 Origin: Site
With the beginning of my country's 3C certification system, the country has put forward higher requirements for the safety and electromagnetic compatibility of electrical products. The relevant standards are GB16836-2003 "General Requirements for the Safety Design of Measuring Relay Protection Devices", GB /T14598.3-1993 "Insulation Test of Electrical Relays", JB/T 9568-2000 "General Specifications for Power System Relays, Protections, and Automatic Devices", International Standard IEC60255-27 (CD: 2002) "Measuring Relays and Protection Devices" "Product Safety Requirements", in which the safety items involved in GB16836-2003 mainly include: mechanical structure, shell protection, insulation coordination, heat generation, the fire test, protection against electric shock, safety signs and safety instructions. What are the product requirements for terminals blocks? let's see.
This is the content:
Mechanical structure safety requirements
Protection requirements for enclosures
Insulation coordination requirements
Requirements for tracking index
Deformation requirements of thermoplastic materials at work
Electric shock protection requirements
Terminal blocks must ensure personal safety in terms of chemical and structural materials and live moving parts, such as the edges and corners of the shell, the burrs in hardware, the connection strength of each part, and even the stability of the product under conditions such as movement, all of the above. It is the requirement of the mechanical structure for terminals blocks in the power industry.
It is mainly the provisions of JB/T 9568-2000 on the protection level, which are mainly divided into two types, one is the protection level of solid foreign objects, and the other is the harm caused by water to terminals blocks equipment, and products.
It is mainly based on the materials, working voltage, and environmental pollution level of the terminals blocks to choose the clearance and creepage distance, to protect the safety of the staff and products, and also to make the terminals blocks products will not have insulation damage due to overvoltage.
During the use of terminal blocks products, the surface of the solid insulating material forms a conductive path under the action of the electric field and the electrolyte, thereby reducing the insulating performance of the shell insulating material and affecting the safety of the product. If under the condition of the same insulation voltage level, when the tracking index is high, the creepage distance of the product can be reduced. If the terminal blocks products enter the power industry, please pay full attention to this aspect.
It is mainly for the temperature rise and contact resistance generated by the terminals blocks during work. The high temperature caused by the high temperature causes the shell to deform and soften, thereby causing an electrical short circuit and causing serious accidents. Therefore, the selection of the current-carrying components of the terminals blocks is very important.
In terms of structure, the operating elements should not be live, and the terminals connected to the internal blocks should not be accessible. This aspect is mainly the requirement for the reliability of the screw torque. It should prevent the screws and wires of the access terminals from accidentally loosening and short-circuiting. Such as the requirements of grounding terminals blocks: the grounding resistance of Class I safety products should not be greater than 0.5Ω.
The above is the relevant content about the product requirements of terminals blocks. If you are interested in terminals blocks, you can contact us. Our website is https://www.chsplastics.com/.
