Conductor resistance failing BIS IS 8130.
₹2.21Cr/year in rejects. BIS suspended. ₹3.8Cr on hold.

[THIS WEEK] Action

Day 1: Pull one die from each drawing position and measure the exit diameter with a calibrated laser micrometer (±0.001mm). Compare to the target 0.260mm ±0.003mm. Any die showing > 0.005mm wear (i.e., exit diameter > 0.265mm) must be replaced. PCD die sets cost ₹8,000–14,000 per die position. Week 1: Fit a calibrated thermocouple inside the annealing furnace chamber at the conductor entry and exit zones. Run temperature profiling at 800m/min and adjust the furnace setpoint so the exit zone reads 390–400°C (accounting for heat loss). At 800m/min line speed with 1.5 sqmm Class 5, you need minimum 2.8 seconds dwell time in the annealing zone at ≥ 375°C. If the furnace is under-length, reduce line speed to 720m/min until a furnace length extension is possible. Week 2: Start recording mid-reel resistance test (at 250m marker) in addition to end-of-reel. Mid-reel failures identify whether the problem is at draw die start (first 250m) or as the die heats up. Month 1: Implement a die life counter — replace PCD dies at 400 tonnes of copper drawn regardless of visual inspection.

Expected impact: Die wear correction: conductor diameter restored to spec → cross-section back to 1.5 sqmm → resistance drop from 14.2 avg to 13.0 Ω/km. Rejects from 12% to 4.8% = ₹88.2L/year saved. Annealing temperature fix: resistivity restored to fully annealed value → another 1.1% resistance drop → rejects from 4.8% to 1.2% = additional ₹37.4L/year. Total: ₹1.25Cr/year recovery (of ₹2.21Cr target). Remaining 1.2% reject rate (irreducible due to copper rod purity variation) resolved by moving to Hindalco ETP rod from KM Copper — Hindalco typical impurity is 30% lower.

[THIS WEEK] Action

Day 1: Stop and measure die eccentricity. Use a digital calliper on a static die sample cut from the extruder exit — measure insulation thickness at 12-o-clock, 3, 6, and 9 positions. If eccentricity > 0.1mm at any position, realign the die head centering bolts (4-bolt cross-head design on your 45mm extruder) until the four measurements are within 0.05mm of each other. This single step typically reduces wall variation by 40–60% and should bring minimum thickness above 0.7mm immediately. Day 3: Reduce cross-head pressure variation by: (a) reducing screw RPM from current setting and reducing line speed proportionally to 52m/min, (b) adding a gear pump between screw and cross-head if available (eliminates screw pressure variation entirely — a used gear pump can be sourced from Boolani or Patel Plastow in Mumbai for ₹85,000). Month 1: Pull the screw and measure barrel/screw clearance. If clearance > 0.4mm at the metering zone (expected for a 36-month screw), replace — a reconditioned 45mm screw costs ₹28,000 and eliminates the pressure variation source permanently.

Expected impact: Die centering fix: eccentricity reduced → min wall from 0.55 to 0.72mm → BIS NC resolved, scrap from 6.8% to 3.1% = ₹1.10Cr/year saved (week 1). Line speed reduction + pressure stabilisation: further improvement to 1.4% scrap = additional ₹49.4L/year saved. Screw replacement: long-term stability at < 0.8% scrap = additional ₹19.4L/year. Total achievable: ₹1.78Cr/year of ₹2.40Cr. The remaining gap is FRLS compound — switching from Vishnu 2.1 MI to a 1.4–1.6 MI FRLS grade reduces flow variation and recovers the last ₹62L/year.

[THIS WEEK] Action

Day 1: Implement the conductor resistance fix (die wear) and insulation thickness fix (die centering) per the specific corrective actions above. Document every step with photographs, temperature logs, and measurement records from the day of implementation. Day 2: Write the BIS corrective action response (CAR) letter. The CAR must follow the 8D problem-solving format: D1 team, D2 problem description, D3 containment, D4 root cause, D5 permanent corrective action, D6 implementation evidence, D7 recurrence prevention, D8 congratulate the team. Attach signed photos of die replacement, temperature calibration records, and new test results from your in-house lab. Day 3: Send 3 samples of 1.5 sqmm and 3 samples of 2.5 sqmm wire (100m each) to an external NABL-accredited lab — ETDC Bangalore, ERDA Vadodara, or BIS-approved lab in Nagpur for IS 8130 + IS 694 testing. Request expedited testing (typically ₹12,000–18,000 per standard, 7–10 working days). Week 3: Attach NABL lab test reports showing PASS to your BIS reinstatement application (Form VIII). Include a written commitment that all production will be tested at NABL lab quarterly until the next BIS inspector visit.

Expected impact: Orders on hold ₹3.8Cr released: critical — these are purchase-order-confirmed state government orders. Missing delivery dates on PSU orders typically results in blacklisting from CPPP/GeM platform for 1–3 years (₹6–14Cr in future government orders lost). BIS reinstatement in 60 vs 90+ days depends entirely on CAR quality and NABL lab evidence. NABL accreditation for your in-house lab: apply now (process takes 6–9 months, cost ₹1.8–2.4L) — once accredited, you can use your own lab for quarterly mandatory testing and respond to future BIS NCs with your own credible test reports within 48 hours instead of waiting 10 days for an external lab. This eliminates your suspension risk in future cycles.