Map the connection and installation route
List endpoints, branches, shielding needs, loads, and access constraints. Identify whether a flat shaped circuit simplifies the available space or whether independently routed wires suit the product better. Use the power-path review to include supply and return requirements. Compare realistic installed envelopes, including connectors, support, and space needed during assembly.
Installed-interconnect comparison
| Criterion | Question for both candidates | Evidence |
|---|---|---|
| Packaging | Does the complete route fit throughout assembly and use? | Installed model and physical trial |
| Termination | How many controlled joining and mating steps are required? | Assembly sequence and inspection plan |
| Movement | Where does deformation or rubbing occur? | Representative duty test |
| Service | What can be replaced and how is access obtained? | Documented service trial |
Evaluate how each architecture is built
For a flex, define material regions, termination geometry, support, and any mounted components. For a harness candidate, obtain the actual wire, terminal, bundle, and assembly specifications from its provider. Use the RFQ structure to keep requirements equivalent. Count joining operations, fixture needs, inspection access, and the risk of installing the wrong branch.
Make service and movement explicit
Determine which parts a technician can disconnect or replace and what must be discarded as a unit. If the connection moves, review the actual flex or harness product under that motion; neither architecture earns a lifetime claim from its name. Trial installation and service with representative assemblies and record time, damage, clearance, and test observations before making the production choice.
Before you release the design
- Compare the same electrical and environmental requirements.
- Include connectors, supports, fixtures, and labor in the estimate.
- Review branch identification and assembly-error prevention.
- Define replacement units and access before freezing the architecture.
Watch points
- A lower bare-interconnect price can be offset by joining, inspection, or service work.
Practical questions
Does a flex circuit always reduce assembly labor?
It may combine routing or connection features, but the actual sequence determines labor. Compare representative assembly trials, including support, insertion, inspection, and any repair steps.
Can one architecture be declared more reliable generally?
Reliability follows the selected construction, interfaces, use conditions, and validation. Compare evidence for the actual candidates rather than assigning a universal ranking.
Technical references
References support the material or design context. Check the exact grade, part number, document revision and project conditions before release.Updated 27 September 2026 · Technical content policy · Engineering guidance supports project review; the agreed drawing defines the build.