Siemens Low Voltage RP1 Unassembled Lighting Panel. Dimensions (H x W x D) IN 74.0 x 20.0 x 5.75. 1-Phase 3-Wire allows 54 circuits user selects Main Device (Lug/Breaker). Rated 120/240V (400A). Special features tin-plated aluminum main bus, subfeed space included