Trace every drum back to its rod coil, drawing run and extruder batch.

A cable maker buys copper or aluminium rod by the tonne and sells finished cable by the metre, so the whole business lives in the conversion between the two units. That is hard. In between, the metal is drawn, annealed, stranded, insulated, sheathed and wound onto drums. Every stage loses a little weight as scrap. Any stage can be the one that failed a test.

Production tracking for cable plants records weight and length at each stage. It ties a drum to the rod coil, the insulation compound lot and the spark test. Quality staff open one drum and see the rod coil, the die set, the compound lot and the spark test result together without hunting.

Rod coils arrive with a supplier test certificate, and the stores clerk weighs each coil against the delivery note before it goes to the drawing shop for the day’s runs. The wire drawing shop pulls them through a series of dies to a set diameter, then anneals the wire. Bunching or stranding machines twist several wires into a conductor with a given lay length. Operators change bobbins. A broken wire means a join or a scrap tag, and every join must be noted so the weight on the drum still adds up at shift end. The planner juggles machine speeds against dispatch dates. Dies wear and need changing.

Extrusion lines coat the conductor with PVC or cross-linked polyethylene, and colour is added from a masterbatch. Cores are laid up, armoured if needed, and sheathed, and the operator records the sheath thickness, the armour wire count and the length marked on the outer jacket for each drum. Finished cable is wound on a drum or tied into a coil. Spark testing, conductor resistance and length marking are done before the drum label goes on. Customers often order by cut length. Remnant drums are a daily question.