What is 1900 Electrical Box ?1900 Electrical Box DefinitionA 1900 Electrical Box is defined as a standard 4-inch square electrical switch box, used when a simple switch box is insufficient.Types and Capacity 1900 Electrical Box 1900 Deep Electrical BoxDesign and DimensionsThese boxes have a patented design for easy cable removal and reuse. The regular box is 4×4 inches and 1.5 inches deep, while the deep box is 4×4 inches and 2.125 inches deep.Historical BackgroundThe name “1900 Box” comes from