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Stadium and sport lighting load is very high, can we use greater than 20A breaker or three-pole breakers greater (> than 20A)
to serve lighting load and still comply with NEC?
Stadium lights are typically 'mogul base', your max circuit
size is 50 amp see 410.62(C)(2) and 210.23(C), if the light boxes are cord connected they might come with a UL listing for the whole assembly.