Defective products and scraps of bundled wires and stranded wires, the main problems are overtorsion, inner or outer single wire breakage, missing strands, surface scratches of single wire or stranded wire, single wire back strand, single wire peeling, scarring, brittleness, Arching, inclusions, wire diameter out of tolerance or wrong mixing, twisting direction wrong, serpentine, large twisting pitch, unqualified length, loose strands, disordered wiring and crushing, scratching, bruising , Wire and cable conductive wire core DC resistance is unqualified, etc.