For over eight decades, Yazaki Corporation has been a global leader in the supply of automotive electrical distribution systems. The company’s product range includes wire harnesses, connectors, and high-voltage assemblies. With its headquarters in Japan and significant operations in Europe and North America, Yazaki Corporation is recognized as one of the world’s largest automotive suppliers. The company’s core strength lies in its ability to manufacture complex wiring systems on a large scale, adhering to stringent compliance and testing protocols.
Yazaki Corporation, through its U.S. subsidiary, Yazaki Innovations, Inc., is now leveraging its manufacturing prowess to venture into the residential sector. The company’s new product, branded as PreFab Home Wiring, is set to enter the U.S. market in 2026. This innovative system applies Yazaki’s harness manufacturing expertise to residential building through a prefabricated wiring platform.
The PreFab Home Wiring system offers a structured approach to modular home wiring. It replaces the traditional on-site electrical rough-in process with factory-assembled wiring harnesses, which are engineered directly from a builder’s plans. Instead of pulling and terminating multiple circuits on site, installers receive pre-measured, pre-cut, and labelled assemblies produced in an ISO-certified facility in Texas.
The system is designed to comply with NFPA 70, the U.S. National Electrical Code that governs safe electrical design and installation, as well as relevant state and local codes. It is supported by installation templates and manuals. The defined sequence of custom design, pre-fabrication, quality testing, packing and shipping, installation, and inspection formalizes electrical installation into a structured manufacturing workflow.
According to the product documentation, Yazaki Corporation aims to achieve reductions of up to 30 per cent in both cost and build time. These efficiency gains are expected to result from bulk wire procurement, plan-based diagramming, simplified installation guides, and reduced material waste. Factory testing before shipment is also seen as a way to reduce inspection failures and rework.
Technically, the system features colour-coded, room-specific harnesses and a vertical drop configuration designed to minimize horizontal drilling and traditional loop-in wiring between boxes. Installation becomes an assembly exercise aligned to pre-engineered layouts rather than a sequence determined in the field.
For modular and offsite housing producers, the significance of the PreFab Home Wiring system lies in the timing of electrical work within the delivery sequence. While structural framing, panels, and volumetric modules have increasingly moved into factory environments, electrical rough-in has often remained site-based.
Factory-assembled wiring systems allow electrical installation to be integrated earlier in the production cycle. In panelised construction, harnesses can be incorporated prior to lining or closure. In volumetric systems, pre-engineered wiring can be installed within modules before transport, reducing the extent of site-based cabling.
