How do you calculate rework cost for a panel shop?

Multiply the number of panels needing rework by the per-panel rework rate and your capture factor, then add fixed cost. With 100 panels at 45 per unit, an 80% capture factor, and 250 fixed, the total is 3,850 dollars.

What does the capture factor represent?

It's the share of defects actually caught and reworked before ship rather than escaping to the field. At 80%, only the captured portion drives the internal rework spend; the rest becomes a warranty or field-service cost elsewhere.

What is the per-unit rework cost?

It's total rework cost divided by the number of panels reworked. In the example, 3,850 dollars across 100 panels is 38.50 per piece — a useful figure to compare against your build margin.

Is rework cost the same as scrap cost?

No. Rework cost assumes the panel is salvageable and re-worked to spec. Scrap cost applies when the unit is discarded entirely, so scrap typically also loses the full original material and build labor.

How can a panel shop reduce rework cost?

Attack the defect rate at its source: verified torque with calibrated tools, poka-yoke wire labeling, and in-process test gates. Cutting the reworked quantity moves the total far more than shaving the per-panel rate.

Why include a fixed cost separately?

Some rework overhead — line stoppage, paperwork, retest setup — doesn't scale per unit. Breaking it out keeps the per-piece figure honest and shows the cost of simply having a rework loop at all.

Switchgear, Panelboards & Electrical Distribution calculator

Rework Cost Calculator

Rework Cost quantifies what it truly costs to fix defective panelboards or switchgear before they ship — the labor to tear down and re-land, the material burned, and the fixed overhead of pulling a unit off the line. Quality managers and production supervisors in electrical distribution use it to size the hidden cost of build errors and to justify investment in first-pass-yield improvements. On a panel floor, a bad torque spec or a mis-wired homerun that surfaces at test can cost more to correct than the original build. This number makes that pain visible so it can be attacked.

What this calculator does

Rework Cost quantifies what it truly costs to fix defective panelboards or switchgear before they ship — the labor to tear down and re-land, the material burned, and the fixed overhead of pulling a unit off the line.
Use it when rework cost in switchgear, panelboards and electrical distribution is being put through a switchgear, panelboards and electrical distribution weighted-cost review.
Multiplies the number of reworked panels by the per-panel rate and a capture factor, adds fixed cost, and returns total and per-piece rework cost.

Formula used

Rework Cost cost = quantity × rate × capture factor + fixed cost
Per-unit rework cost = total cost ÷ quantity

Inputs explained

Panels requiring rework:
Rework labor and material rate per panel:
Share of defects captured before ship:
Fixed rework setup and admin cost:

How to use the result

Use it at quality reviews to price a defect trend, or when building a business case for tooling, fixturing, or process changes that cut rework.
It assumes a single representative rework rate; a mix of trivial re-terminations and full teardown rebuilds needs to be modeled separately.

Current U.S. benchmarks

The producer price index for copper and brass mill shapes stands at 559.593 (BLS, May 2026), up 76.8% from a year earlier. Quotes priced off last quarter's material cost miss this move. Global copper trades at $13,484 per tonne (IMF via FRED, May 2026).
Industrial electricity averages 8.66 cents per kWh across the U.S. (EIA, Apr 2026), up 5.5% from a year earlier. Energy-intensive steps carry this directly into unit cost.
On-highway diesel averages $4.58 per gallon this week (EIA), trending down over recent periods. Truck tonnage is up 3.4% year over year (ATA via FRED).
The U.S. has 21,668 machinery manufacturing establishments employing about 1,086,146 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate rework cost for a panel shop? Multiply the number of panels needing rework by the per-panel rework rate and your capture factor, then add fixed cost. With 100 panels at 45 per unit, an 80% capture factor, and 250 fixed, the total is 3,850 dollars.
What does the capture factor represent? It's the share of defects actually caught and reworked before ship rather than escaping to the field. At 80%, only the captured portion drives the internal rework spend; the rest becomes a warranty or field-service cost elsewhere.
What is the per-unit rework cost? It's total rework cost divided by the number of panels reworked. In the example, 3,850 dollars across 100 panels is 38.50 per piece — a useful figure to compare against your build margin.
Is rework cost the same as scrap cost? No. Rework cost assumes the panel is salvageable and re-worked to spec. Scrap cost applies when the unit is discarded entirely, so scrap typically also loses the full original material and build labor.
How can a panel shop reduce rework cost? Attack the defect rate at its source: verified torque with calibrated tools, poka-yoke wire labeling, and in-process test gates. Cutting the reworked quantity moves the total far more than shaving the per-panel rate.

Last reviewed 2026-05-12.