Marine, Shipbuilding & Boat Manufacturing worked example

Marine Wiring Harness Length at 11% service loop and termination allowance: a worked example

Suppose service loop and termination allowance falls to 11%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate total marine wiring harness length based on vessel LOA, circuit count, routing factor, and service loop allowance for electrical outfitting.

The inputs for this scenario

  • Vessel length overall (LOA): 12 m (held at the documented default)
  • Number of electrical circuits: 24 circuits (held at the documented default)
  • Average routing distance factor: 1.1 x LOA (held at the documented default)
  • Service loop and termination allowance: 11 % (the input this scenario stresses; the baseline uses 15)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base cable length = vessel LOA x routing distance factor x number of circuits.
  • Total cable harness length to order works out to 26,182 m at these inputs, and this is the headline figure for the scenario.
  • Base cable length (before service loops) works out to 288 m at these inputs.
  • Service loop and termination allowance works out to 25,894 m at these inputs.
  • Cable utilization factor works out to 1.1 % at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where service loop and termination allowance sits at 15% and the headline result is 26,182 m, this scenario lands almost exactly on the baseline at 26,182 m.
  • It computes total cable length to order by multiplying vessel LOA by a routing distance factor and the circuit count, then adding a service loop and termination allowance. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Total cable harness length to order: 26,182 m (headline result)
  • Base cable length (before service loops): 288 m
  • Service loop and termination allowance: 25,894 m
  • Cable utilization factor: 1.1 %

Run it with your numbers

  • To rerun this with your own numbers, open the live Marine Wiring Harness Length calculator, set service loop and termination allowance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.