This guide breaks down everything you need to know about electrical distribution boxes in plain English. We'll explain what they are, the different panel types you'll encounter, NEC 408 requirements that govern their installation, and common applications for each type. Designed to manage and distribute alternating current (AC) power, this type is. What is a Distribution Box? A distribution box, or DB box, is a circuit breaker enclosure. Whether it's a home, office, or factory. (DOE) Office of Electricity (OE). The Modern Distribution Grid series has benefited from regulatory and industry insights and feedback from s akeholders in more than 20 states. Specifically, this Guidebook draws from engagement with the New England Conference of Public Utility Commissioners. Forest City Ratner's 32-story residential complex adjacent to Barclay's Arena in Brooklyn, NY, advanced the modular concept with individual building sections constructed at a factory off-site and erected by crane into place.