Free-stand enclosures, multi-door, type 12. Seams continuously welded and ground smooth, no holes or knockouts. 10 gauge steel. Heavy steel back stiffeners maintain flatness and increase rigidity. Heavy-duty lifting eyes anchored into reinforced top. Overlapping, gasketed openings on two-door centerposts. At two-door openings, gasketed overlapping doors eliminate need for centerposts. Three-point latches operated by padlocking handle. Latch rod rollers for easy door closing. Heavy-gauge continuous hinges support each door. Mechanical interlock standard on each enclosure with right-hand door serving as master door. Doors can be closed in any order. Panel supports. Large data pocket is high-impact thermoplastic. Oil-resistant door gasket. Panel mounting studs. Bonding provision on doors. Provisions for mounting fluorescent lights.