Rainproof galvanized steel enclosure. Single phase, 3 wire, insulated/bondable split neutral, 20 (1") spaces, 40 poles, 120/240 volt AC. Main breaker type BW at 25,000 AIC. Furnished with hub closure plates, hubs and ground bar kit (necessary for sub-feeding) sold separately. Tin plated aluminum bus bar. Twin neutral with non-removable cross bus connecting them. When bonded, unused neutral connections may be used for equipment ground protectors in service entrance application. #2 - 300 kcmil wire range. Electrostatic powder coat, baked urethane painted. Rotate 180 degrees for bottom feed; orientation of main breaker handle consistent with NEC 240-81 requirements because it operates horizontally. 14-5/16" x 29-1/8" x 5-3/16". UL Listed file E52977.