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In the case of MCC Rooms, is there an exception to a typical bujilding department rule requiring fire sprinklers if an area exceeds, say, 5000 square feet? If the MCC room has firewalls, is it exempt from the sprinkler requirement?

Is there any NEC requirement or guidelines relating to breakers of the same ampacity in series? This would be a situation where electrical system coordination is not necessary. For example, a 400A main breaker in a panelboard in series with a 400A branch breaker in the same panelboard. Another...