Short answer: TB/T 3111 is now a two-part series, both effective 1 September 2026: TB/T 3111.1-2026 (copper and copper-alloy stranded wires) replaces TB/T 3111-2017, and TB/T 3111.2-2026 (aluminum-clad steel reinforced aluminum stranded wire) replaces TB/T 2937-1998.
Technical changes
Copper-magnesium stranded wire grades are revised, copper-chromium-zirconium stranded wire (JTCZ) is added as a new grade, and the structure and parameters of aluminum-clad steel cored aluminum stranded wire are fully updated along with joint and current-carrying test requirements.
Related products
Copper-magnesium stranded wire | CuCrZr stranded wire | ACSR aluminum-clad wire