If a Main DB is divided into 3 parts i.e. "Normal" Power (White Section) "Emergency" Power (Red Section) and "UPS" Power (Blue Section) and all sections have different feeds do I need to give 3 separate COC's even if its one big DB? This may sound like a stupid question for a wireman to ask but I have only been doing three phase houses recently and am having problem with understanding this situation in a large commercial building. I am looking to do a refreshers course soon but any help or advice would be appreciated.