Switchgear, Panelboards & Electrical Distribution worked example

Wire Duct Fill at 99% wireway routing efficiency: a worked example

What does the result look like when wireway routing efficiency reaches 99%? The full calculation is worked below with real intermediate numbers. Use it when wire duct fill in switchgear, panelboards and electrical distribution is being committed and you need a throughput number you can defend.

The inputs for this scenario

  • Feet of wire duct laid up per shift: 1,200 units (unchanged)
  • Assembly shift length: 8 hr (unchanged)
  • Wireway routing efficiency: 99 % (raised for this scenario; the documented default is 90)

Working through the calculation

  • Applying the documented formula (Raw wire duct fill = completed output รท runtime) to the inputs above produces each figure below.
  • At this operating point the engine returns 149 units for effective throughput, the number this scenario is built around.
  • At this operating point the engine returns 150 units for raw throughput.
  • At this operating point the engine returns 99 % for efficiency.
  • At this operating point the engine returns 8 hr for runtime.

How this compares with the baseline

  • Against the tool's baseline example, where wireway routing efficiency sits at 90% and the headline result is 135 units, this scenario comes in 10% above the baseline at 149 units.
  • A figure at this level is achievable when wireway routing efficiency is genuinely sustained, not just peaked for a shift. A single efficiency percentage can't distinguish a clean open panel from a dense, congested lineup where fill and dressing slow dramatically as duct fills past 40-50%.

Results at a glance

  • Effective throughput: 149 units (headline result)
  • Raw throughput: 150 units
  • Efficiency: 99 %
  • Runtime: 8 hr

Run it with your numbers

  • Every input above is editable in the live Wire Duct Fill calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.