Low-voltage metal-enclosed switchgearwhich contains either stationary or drawout, manually or electrically operated low-voltage ac or dc power circuit breakers in individual metal compartments, in three-pole, four-pole, two-pole, or single-pole constructionis covered. Rated maximum voltage levels are 254 V, 508 V, or 635 V, 730 V, or 1058 V ac and 300/325 V, 600 V, 800 V, 1000 V, 1200 V, 1500 V, 1...