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NEMA PB-2, UL 891, NFPA 70 Art. 408
All unused mounting space in QMB distribution sections must be close off with filler plates.
Speed-D switchboards with provisions for current series QMB branch devices come furnished with (2) 15 inch closing plates, QMB15BLW. Other available closing plates to fill unused space are QMB1BLW (1.5 inches), QMB3BLW (3 inches), and QMB6BLW (6 inches).