IEEE C 37.20.1b-2006 带金属包壳的低压电力断路器开关装置.修改件2:直流牵引电力开关装置中控制和辅助电力布线的附加要求
Metal-enclosed low-voltage power circuit breaker switchgear - Amendment 2: Additional requirements for control and auxiliary power wiring in dc traction power switchgear
Low-voltage metal-enclosed switchgear-which contains either stationary or drawout, manually or electrically operated low-voltage ac or dc power circuit breakers in individual grounded metal compartments, in three-pole, two-pole, or single-pole construction-is covered. Rated maximum voltage levels are 254 V, 508 V, or 635 V (ac) and 300/325 V, 800 V, 1000 V, 1200 V, 1600 V, or 3200 V (dc). The standard deals with service conditions, ratings, temperature limitations, and classification of insulating materials, insulation (dielectric) withstand voltage requirements, test procedures, and application.