Engineering teams developing aviation systems and aircraft strive to meet the demands of performance, quality, reliability and profitability. But most commercial aircraft will never leave the ground without strict attention to regulatory compliance. Specialized standards apply to virtually every bolt, panel, window, and wire in a modern airplane. For passenger-carrying aircraft, some of the most demanding regulations relate to the aircraft’s Electrical Wiring Interconnect Systems (EWIS).
Source : How Electrical Wiring Interconnect Systems (EWIS) requirements is changing Aerospace wiring harness design and manufacture – Air&Cosmos – Premier Site Francophone d’Actualité Aéronautique et Spatiale