# Wire Harness Costing: Copper Prices, Scrap and Protecting Margin > Source: https://netray.co/resources/wire-harness-costing-copper-prices-margins > Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems. > Section: Knowledge Base ## Short answer How to cost wire harnesses so margin survives copper swings, connector price changes, scrap and rework: standard vs actual cost, surcharges and repricing. ## Category erp-general ## Content **Intro:** Wire harness costing has to survive copper price swings, connector price changes, scrap on cut wire and rework on hand assembly. The method that holds up is standard cost for quoting and planning, actual cost tracked per job, and a monthly variance review by component group and by operation. Add a way to reprice quotes that sit open for weeks, because wire and terminal prices move. This guide covers how to structure cost in the ERP and how to find where margin is quietly leaking. **Sections:** #### Material Is the Largest Line and the Least Stable **Body:** On many harnesses material is the majority of cost, driven by connectors, specialty wire and terminals. Copper content makes wire prices move with the metals market, and connector suppliers revise price lists and lead times with little notice. Keep price history by item and vendor, set quote validity to a realistic period for copper-sensitive content, and record the price date on the quote. Where customer volume justifies it, negotiate a material price adjustment clause tied to a published index, or quote with a pass-through for specific wire. **Bullets:** - Quote validity tied to material price volatility - Price history by item and vendor - Index-based adjustment for copper-heavy wire - Blanket orders for long-lead connectors #### Scrap and Remnants Are Real Cost **Body:** Cut-to-length wire creates unavoidable waste from machine setup, strip-length adjustment and spool ends, and short lengths waste proportionally more. Set scrap factors by component class and check them against actual issues versus theoretical usage. Track remnants: if a leftover spool piece cannot be used, it is scrap and should be expensed to the job that used it. If you use partial spools on later jobs, valuation must follow the lot or you will misstate the next job's cost. #### Standard Cost Versus Actual Cost **Body:** Standard cost makes quotes consistent and highlights variance, while actual cost shows what happened. Most harness shops benefit from standard costs for material and labor routings, updated at a defined cadence, with actual costs collected at the job level. The gap is the information: purchase price variance, usage variance (scrap and substitutions), efficiency variance and rework. A job that quoted at 30 percent margin and ended at 12 should tell you which of those four moved. Review at the component group and operation level, not just job totals. **Bullets:** - Purchase price variance by vendor - Usage variance from scrap and substitution - Labor efficiency variance by operation - Rework and warranty cost as separate lines #### Overhead, Tooling and NRE Allocation **Body:** Applicator wear, test fixtures, formboards, calibration and training are costs that disappear into overhead unless you decide how to allocate them. Prototype-heavy shops carry large unrecovered engineering time. Review whether your overhead rate reflects the machine-hour intensity of automatic processing versus hand assembly, since a single blended rate overprices manual work and underprices machine work, or the reverse. Make NRE visible on quotes so repeat orders do not carry costs already recovered. #### Margin by Customer, Product Family and Quantity **Body:** Look for patterns: small lots that never recover setup, a customer whose drawings always omit cavity plugs, or a harness family with chronic rework. Margin reports by customer and product family, using actual cost, show which business to reprice or decline. Some work is worth keeping at lower margin for volume or strategic reasons, but that should be a decision, not a surprise. #### Where AI Helps **Body:** An assistant over the ERP can answer "which jobs closed under target margin this quarter and which variance caused it", flag open quotes with outdated material prices and compare estimates to actuals for similar harnesses. It reads the data you already have, with read-only access by default. It cannot fix poorly captured actuals, so if operators do not clock to routings or issues are backflushed carelessly, fix data collection first. **Cta:** Netray can analyze your closed jobs for margin leakage by component and operation and flag open quotes priced on stale material costs. **Faq:** #### How do you protect wire harness margins when copper prices change? **Answer:** Limit quote validity for copper-heavy wire, record the price date, and where volume allows, use an index-based adjustment clause. Keep price history so you can reprice open quotes quickly. Also track purchase price variance by vendor so changes show up in reporting. #### What scrap rate should I use for wire harness costing? **Answer:** It depends on wire type, length and machine setup practice. Short lengths and exotic wire waste proportionally more. Set scrap factors by component class, then compare actual issues to theoretical usage from completed jobs and adjust the factors from your own data. #### Should a cable assembly shop use standard or actual costing? **Answer:** Many use standard cost for quoting and planning and capture actuals per job to compute variances. That gives consistent quotes and tells you whether margin moved because of price, usage, efficiency or rework. Choose a method your ERP can maintain without heavy manual effort. ## Related Slugs - manufacturing-costing-methods-comparison - gross-margin-analysis-manufacturing - syteline-costing-variance-investigation - syteline-job-costing-configuration-guide ## Search terms wire harness costing, cable assembly margin analysis, copper price wire harness quote, harness job costing variance, wire scrap factor costing, cable assembly pricing strategy --- Talk to an engineer: https://netray.co/contact?intent=erp_ai | Machine catalog: https://netray.co/agent/catalog.json