Key cost drivers include panel amperage, indoor vs outdoor location, wiring length, and whether a full panel upgrade or rerouting is needed. Learn how to wire a distribution box step by step! This video shows real on-site footage of electrical installation, demonstrating safe and standardized wiring methods used by professionals. The article outlines cost ranges, per-unit pricing, and practical. Covers wiring, placement, standards, and expert tips for a compliant setup. It takes the incoming power and safely distributes it to different circuits throughout your building. Wiring Direction: Wiring between the main circuit breaker and each branch circuit breaker in the box generally.