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Clearance requirement for MCCB

According to UL 489 Table 6.1.6.1.1 for a 301-600 volt circuit breaker, the clearance from a terminal to ground must be no less than 0.5 inches in air and 1.0 inches along a surface.  Phase to phase clearance must be no less than 1.0 inches in air and 2.0 inches along a surface