Why can't galvanized steel strip be used for armoring of single-core structure of ZA-RVV22, but it can be used for multi-core structure?-Cable Manufacturer

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Zhejiang Yuantong Wire & Cable Manufacturing Co.,Ltd.is a subsidiary of the world-renowned Fortune Global 500 company(ranked 150th in 2024)and a large state-owned holding enterprise group in Zhejiang Province—Wuchan Zhongda Group Co.,Ltd.(stock code SH600704).Located in Linping District,Hangzhou,the company was established in 2000 with a registered capital of 895 million yuan.It specializes in the integrated services of production,sales,research and development,and service of wires and cables.The company is committed to“providing customers with safe cables”and focuses on producing a wide range of cable products,including building wires,control cables,power cables of 110kV and below,mining cables,rubber-sheathed cables,ship cables,computer cables,fire-resistant cables,and other special types of cables.It ranks in the top 20 of China's cable industry.

Why can't galvanized steel strip be used for armoring of single-core structure of ZA-RVV22, but it can be used for multi-core structure?

2025-09-02 Leave a message

Steel tape is a ferromagnetic material. When steel tape is used for armoring single-core cables, magnetic lines of force pass through the tape during operation. Because both ends of the tape are grounded, forming a loop, current flows through it, causing the cable to heat up and reducing its current carrying capacity. This phenomenon does not occur in three-core cables, where the magnetic lines of force are balanced and offset.