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What is the difference between a loadcenter and panelboard?

There is no difference as far as UL and the NEC are concerned. Eaton offers "loadcenters" as we call them which are panelboards that are targeted to the residential markets and are consider a lower cost version of a panelboard for that market. Typically the loadcenter has plug in type breakers that are required compared to panelboards that allow for bolt on breakers... A panelboard is typically used in a commercial or industrial application. Panelboards have a can, interior and trim. The can is installed at rough in and the interior later. Loadcenters are limited to 240V or less and max at 400A. all these consideration come into play and unless the specs have specific requirements that define the panelboard further, A loadcenter or panelboard as we define it can be offer if it meets the application and spec.