Interpretation Of Terminal Block Standards: Understanding The Latest Industry Requirements
As the core component of electrical connections, the standard of terminal blocks is directly related to the safety and stable operation of electrical systems. In recent years, with the rapid development of electrical technology, the industry standards for terminal blocks have been constantly updated, placing higher demands on materials, design, performance, and safety.
1、 Material and Process Standards
The terminal blocks should be made of metal materials with good conductivity, such as T2 copper, and treated with tin plating to enhance corrosion resistance. For example, the GB/T 14315 standard specifies that the chemical composition of copper materials must comply with the T3 copper specification, and aluminum materials must meet the 1060 industrial pure aluminum standard. Friction welding technology is widely used in manufacturing processes to avoid the risk of fracture at the transition between copper and aluminum, while ensuring weld strength through a 180 ° bending test.
2、 Safety and Protection Standards
The new national standard has strengthened the requirements for insulation and protection. For example, in the field of plugs and sockets, it is required that live plugs be equipped with insulation sheaths to prevent electric shock during insertion and removal; The terminal blocks need to pass the UL94 V0 flame retardant test to ensure that they will not burn during high temperatures or short circuits. For humid environments, the terminals must achieve an IP68 waterproof rating, and metal parts must be tin plated or made of stainless steel to prevent oxidation and corrosion.
3、 Performance and Testing Standards
The terminal blocks must pass strict mechanical and electrical performance tests. For example, the tensile load test requires aluminum terminals to withstand a tensile force of 40 × A (where A is the nominal cross-sectional area), and copper terminals to withstand a tensile force of 60 × A, with no slippage at the crimping point within 1 minute. The thermal cycling test simulates extreme temperature changes and requires a resistance ratio growth rate of no more than 2.0 to ensure long-term stability.
4、 Application scenario refinement standards
Further refine the standards for different scenarios.; The terminals of industrial control cabinets need to meet the requirements of high voltage resistance and anti-interference, and adopt dust-proof design
