I have a 100A 2 pole 480V Main circuit breaker. The cables then splice to feed two separate distribution panelboards rated 240/480 volts. The panelboards then feed LED light fixtures using 240V single phase using 30A 1P breakers. The total lighting load is 23.5kW pretty much balanced. What is the calculation to determine whether the main circuit breaker is sized appropriately? Is 100A sufficient?