Cost & Quoting

What Drives Cost Per Panel in Switchgear and Panelboard Manufacturing, and How to Quote It

A money-first breakdown of what a panel actually costs to build, from copper and enclosure spend to wiring labor, test bay time, and the inspection burden that quietly erodes margin.

Cost per panel splits into five buckets: material, wiring labor, enclosure and mechanical, test and inspection, and overhead. For a mid-size 400 A distribution panel, a typical split runs material 35 to 45 percent, labor 25 to 35 percent, enclosure 10 to 15 percent, test and inspection 8 to 12 percent, and burdened overhead on top. The Cost Per Panel calculator rolls these into a unit cost, but you quote badly if you cannot defend each bucket line by line to a purchasing agent who will challenge them.

Material is copper-driven and volatile. At 38.8 lb of busbar copper per panel and a fabricated bar cost near 6.50 to 9.00 dollars per lb depending on plating and cut complexity, that single line is 250 to 350 dollars and moves with the LME. Breakers, meters, and CTs often exceed the copper: a 400 A main plus twenty branch breakers can run 1800 to 3200 dollars. Quote copper at a dated index with an escalation clause; a 15 percent copper swing on a 300 dollar bar line is 45 dollars per panel, and on a 200-panel order that is 9000 dollars of unhedged exposure.

Wiring labor is where estimates most often miss. Panel Wiring Labor scales with termination count, not enclosure size. A control panel with 240 terminations at a blended shop rate of 65 dollars per hour and 1.5 minutes per point lands at 240 times 1.5, which is 360 minutes, or 6 hours, about 390 dollars. Add torque verification separately: 48 minutes per panel at 65 dollars is another 52 dollars. Estimators who bid off square footage or breaker count instead of terminations routinely under-quote labor by 20 to 30 percent.

The enclosure is a firmer number but has traps. Enclosure Cost tracks NEMA rating, size, and finish. A painted NEMA 12 24 by 36 by 12 in box runs 220 to 400 dollars; jump to 316 stainless NEMA 4X and the same footprint is 700 to 1200 dollars, a 3x swing that must match the environment on the spec. Cutouts, gland plates, and window kits add 40 to 150 dollars each. Quoting a NEMA 1 price against a 4X requirement is a five-figure error on a fleet order once you back-charge the fix.

Test and inspection burden is real cost, not a formality. Test Bay Capacity tells you throughput: if a bay handles 6 panels per shift and the bay costs 900 dollars per shift loaded, that is 150 dollars of test cost per panel before any retest. Inspection Burden adds hi-pot, torque audit, and point-to-point continuity; budget 45 to 90 minutes of inspector time per panel at 55 to 70 dollars per hour, roughly 55 to 100 dollars. Skipping these in the quote does not remove them from the job; it moves them into your margin.

Scrap and rework are the silent killers. A miswired panel caught at test can cost 2 to 4 hours of teardown and re-terminate, 130 to 260 dollars, plus retest slot time. If first-pass yield is 92 percent, 8 of every 100 panels carry that rework, spreading roughly 15 to 25 dollars of rework cost across every unit whether or not it failed. Build a rework reserve into the quote explicitly rather than pretending yield is 100 percent, because your actuals will prove it is not.

Overhead and margin turn cost into price. After summing direct cost, apply a burden multiplier for facility, indirect labor, and equipment, commonly 1.35 to 1.65 on direct cost for a panel shop. Then add target margin. On a 400 A panel with 900 dollars direct cost and a 1.45 burden, cost to make is about 1305 dollars; at 22 percent gross margin the quote is near 1675 dollars. Thin the margin below 15 percent and a single rework event or copper spike puts the job underwater.

Where estimates go wrong is predictable: termination count guessed instead of counted, copper priced at an old index, enclosure rating assumed one class too low, and test and inspection labor left off entirely. Tighten the quote by pulling termination counts from the wiring schedule, dating your copper price, confirming the NEMA rating against the site, and adding test, inspection, and a rework reserve as named lines. A quote built from these inputs survives a purchasing audit; one built from a gut multiplier does not.

Published 2026-07-01.