NFPA 30 Table 7.3.3 Drum and container filling – outdoors or indoors – NEC Class 1, Div 1, Zone 1 within 3’
of the vent or fill opening, extending in all directions.
NEC Class 1, Div 2, Zone 2 from 3’ to 5’ from the vent or fill opening,
extending in all directions; also, up to 18” above floor or grade level
within a horizontal radius of 10 ft from the vent or fill opening.
Also, Div 1 for the trench below floor level.
Why would the trench below floor level be considered class1 div1 ?