1 . Design & material foundation
Harness design establishes the fundamental limits of manufacturability. Specifying a wire gauge too rigid for the required bend radius or selecting incompatible contact plating compromises assembly reliability long before production begins.
This chapter defines Design for Manufacturability (DFM) principles for cable assemblies. It details the selection of appropriate insulation materials, definition of manufacturing tolerances, and validation of the Bill of Materials (BOM) against procurement and production environments.
- 1.1 Quality baseline: IPC/WHMA-a-620 classes
The IPC/WHMA-A-620 standard is the central quality benchmark for the cable and wire harness manufacturing industry. It establishes clear, objective criteria for what constitutes an acceptable or rejectable condition in an electronic assembly. The sta...
- 1.2 Conductor materials: the electrical core
The bare conductor is the functional core of any wire harness. Your choice of conductor material determines not only the baseline electrical performance—such as current capacity and signal integrity—but also the long-term mechanical reliability of th...
- 1.3 Insulation & cable structures: environmental armor
While the bare copper conductor forms the electrical core of a wire harness, the chemical insulation and the overall cable structure provide the mechanical and environmental protection. These external elements define the harness's ability to withstan...
- 1.4 Connector families: the mechanical interface
The connector is a critical component in any wire harness, specifically designed to allow the circuit to be broken and re-established. Because of this requirement, it is often the most vulnerable point in the entire electrical path. A connector is a...