+7
A 70mm bare conductor refers to its cross-sectional area, not a simple thickness, typically being a flexible stranded copper cable with a total area of 70 square millimeters, often made of many fine wires (e.g., 19 strands of 2.14mm each or 2318 strands of 0.2mm each for higher flexibility) used for grounding or high-current applications. The "thickness" (overall diameter) varies, but it's around 15-19mm for insulated versions, with the bare conductor being slightly less.