Abstract: A molded plastic enclosure of an electrical disconnect is presented. The disconnect has a switch mounted within the enclosure for manually disconnecting electrical equipment from a source of power. The disconnect enclosure includes a molded base hingedly attached to a cover. The base includes an interior compartment for mounting the disconnect switch therein. The base also includes a plurality of knockouts, which can be removed (knocked out) to provide access for electrical wiring. Each knockout has a plurality of concentric circular sections, each having an angular groove formed on their circumference. The smallest-diameter section includes a groove with a cross-sectional shape having a sharp corner (knife-edge) while the larger-diameter sections include grooves with cross sections having radiused corners. Additionally, the depth of the groove for smaller-diameter sections is greater than the depth of the groove for larger diameter sections.

Abstract: A disconnect having a switch mounted within an enclosure is presented. The enclosure comprises a base including a rear wall, and first and second sidewalls extending generally perpendicular from opposing side boundaries of the rear wall. The rear wall and first and second sidewalls define an interior compartment of the base for mounting the switch therein. The enclosure further comprises a cover sized to enclose the interior compartment. At least one pair of opposing protrusions extend inwardly from each of the first and second sidewalls. The pair of protrusions abut against opposing ends of the switch to restrain movement of the switch in a generally perpendicular direction and a laterally upward direction to the rear wall of the enclosure, when the disconnect switch is mounted in the disconnect enclosure. A retaining device, e.g., a ground terminal, abuts against the switch and is secured to the rear wall of the enclosure to restrain movement of the switch in a laterally downward direction.