Cabinets and cutout boxes shall be deep enough to close doors when which circuits are in any position?

Cabinets and cutout boxes must be designed to accommodate the closure of their doors when 30-ampere branch-circuit panelboard switches are in any position due to the physical size and configuration of the components involved.

In many electrical installations, larger switches, like those rated for 30 amperes, often have a bulkier build compared to their lower-rated counterparts. This necessitates a deeper cabinet or box to ensure that the switches can be accessed and operated without obstruction, regardless of their position. Ensuring that the doors can close properly not only prevents accidental tampering but also protects the internal components from dust and physical damage, contributing to overall safety and functionality.

The other amperage ratings do not present the same clearance issues, as they generally involve smaller switches that can fit more comfortably within shallower cabinets or boxes. Therefore, the requirement specifically emphasizes the need for deeper cabinets in the context of 30-ampere branch-circuit panelboards to ensure that installations comply with safety standards.