3357 Drawing and Insulating of Nonferrous Wire Establishments primarily engaged in drawing, drawing and insulating, and insulating wire and cable of nonferrous metals from purchased wire bars, rods, or wire. Also included are establishments primarily engaged in manufacturing insulated fiber optic cable. Establishments primarily engaged in manufacturing glass fiber optic materials are classified in industry 3229, and those manufacturing fabricated wire products from purchased wire are classified in industry 3496.