VSD/EMC screened cables, frequency converter cables and 3c+3e cables are special cables designed for power transmission in complex electromagnetic environments, with excellent anti-interference ability and stable transmission performance.​ VSD (Variable Speed Drive) cables and EMC (Electromagnetic Compatibility) screened cables adopt a multi-layer shielding structure, usually including copper tape wrapped shielding and copper wire braided shielding, which can effectively suppress electromagnetic interference (EMI) and radio frequency interference (RFI), ensuring the synchronous transmission of power and signals in frequency conversion systems. Their conductors are mostly high-purity copper with excellent conductivity, and the insulation layer is made of cross-linked polyethylene (XLPE) or polyvinyl chloride (PVC) with strong temperature resistance, which can adapt to the working environment of -40℃ to 90℃ and meet the temperature change requirements when the frequency converter starts and stops frequently.​ The 3c+3e cable has a multi-core structure, where "3c" refers to 3 main core wires for power transmission, and "3e" refers to 3 grounding wires or signal wires, which enhance the system safety and signal feedback capability. This structural design enables the cable to achieve precise signal control while taking into account power transmission, and is suitable for frequency conversion drive systems that require two-way communication.​ Such cables are widely used in industrial automation production lines, elevator drive systems, machine tool frequency conversion equipment and other scenarios. They can operate stably in high-frequency and high-interference environments, ensuring precise control and efficient work of equipment, and are key components in modern industrial electromagnetic compatibility design.