Custom cable assemblies are often the last item considered and the first to fail in the field. A well-designed assembly reduces cost, simplifies installation, and improves long-term reliability. Here are the design decisions that matter most.
Connector Selection Sets the Standard
Choose connectors based on mating cycles, current rating, ingress protection, and vibration exposure. Standardized connectors such as USB, RJ45, and M8/M12 are cheaper and easier to source than proprietary designs. Verify the mating counterpart is available and compatible before finalizing the design.
Wire Gauge, Shielding, and Jacket Material
Wire gauge must carry the current with acceptable voltage drop over the cable length. Shielding prevents interference in signal cables, while jacket material determines temperature range, flexibility, and chemical resistance. PVC suits general indoor use; PUR or TPE works better for harsh and outdoor environments.
- Define current, voltage, and signal integrity requirements first
- Specify shielding for noisy environments and long runs
- Choose jacket material for the operating temperature and chemicals
- Include strain relief at every connector entry point
Testing and Documentation
Require continuity, hipot, and pull-test data on production lots. Clear labeling, wiring diagrams, and revision control prevent field mistakes. A cable assembly with proper documentation is easier to inspect, repair, and reorder.
