Abstract: An enclosure for electrical components comprises an electrically non-conductive molded plastic liquid tight rectangular box-like container having an upwardly open end and defined by side walls joined at upwardly extending corners. Each of the upwardly extending corners includes a vertically extending channel with a vertical access slot. The access slot is narrower than the associated channel to provide a fastener receiving opening for mounting electrical structure within the enclosure. Fasteners are mounted for vertical adjustment in the channels to allow selective positioning of panels or components in the enclosure.