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EMS handbook

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 serves as a reliable central quality benchmark for the cable and wire harness manufacturing industry. It establishes clear criteria for the acceptable or rejectable con...

  • 1.2 Conductor materials: the electrical core

    The bare conductor serves as the functional core of any wire harness. The selection of conductor material dictates not only the baseline electrical performance (e.g., current capacity, signal integrit...

  • 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...

  • 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 poin...