Modular bucket assemblies enable selective configuration of switchgear compartments for conformance with selective levels of personnel accessibility to energized switchgear. The bucket assemblies can be configured to enable personnel access to energized compartments while service doors are open, such as for instrumentation compartments. Interiors and the front face of instrumentation compartment bucket assemblies are isolated from potential infiltration of hot arc gasses in the switchgear cabinet. Other compartments can be configured to enable personnel access to the front face of a fully closed door energized circuit breaker compartment by isolating the compartment door exterior and venting any hot arc gasses out of the compartment interior in a direction away from the front and other peripheral sides of the switchgear cabinet.