Brian from Pioneer Builders provides a comprehensive walkthrough of electrical rough-ins in a custom Adu build. He highlights the importance of understanding electrical fundamentals for homeowners and builders. Brian discusses the various aspects of electrical rough-ins, from temporary power to permanent power, outdoor disconnects, lighting design, receptacle placement, low voltage wiring, and mechanical room setup for generators and HVAC systems. He emphasizes safety measures, code compliance, and thoughtful planning for efficient and functional electrical systems. Brian also touches on specific details like switch placement, wiring for appliances, and considerations for specific rooms like the kitchen, laundry room, bedrooms, and storage areas.