Modular box size refers to the standardized dimensions of wall-mounted back boxes, categorized by the number of modules (e.g., 1 Module, 3 Module) to secure switch plates. Compared to conventional switch boxes, modular box sizes offer greater flexibility and standardization, supporting diverse module configurations. In India, modular box sizes are typically measured in inches—for instance, 3 x 3 inches for 1-2 Modules—while regular boxes often have fixed dimensions that limit expandability. This makes modular boxes superior in both safety and aesthetics.