Panelboard Enclosure, Amps 600 A, Number of Spaces 42, Mounting Style Surface, For Use With Square D NQOD Lightning and Appliance Panelboards, NEMA Rating 1, Compatible Single Phase Interior Mfr. No. NQOD42L600, NQOD42L225CUTF, NQOD54L225CU, Compatible Three Phase Interior 22P074, 3TZ08, 3TZ09, Length 56 in, Width 20 in, Depth 5.75 in, Material Steel