A panelboard is a type of enclosure for overcurrent protection devices and the busses and connections that provide power to these devices and their associated circuits. According to the NEC[R] (National Electric Code [R]), panelboards are used to control light, heat, or power circuits; are placed in a cabinet or cutout box; mounted in or against a wall; and accessible only from the front. Graybar has a great selection of panelboards, panelboard accessories, and panelboard covers.