Historical
NEMA PB 1:2006
Panelboards
Covers single panelboards or groups of panel units suitable for assembly in the form of single panelboards, including buses, and with or without switches or automatic overload protective devices (fuses or circuit breakers), or both. Excluded are live-front panelboards and panelboards employing cast enclosures for special service.
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NEMA: National Electrical Manufacturers Association [nema]