KNOCKOUT ARRANGEMENT PROVIDING CONNECTION PATTERN CHOICE ON ELECTRICAL JUNCTION BOX AND COVER PLATE ARRANGEMENT FOR MOUNTING DYNAMIC LOADS.

摘要

A knockout arrangement for an electrical junction box includes a housing having at least one side wall being substantially planar, a pair or spaced part first knockout structures on the side wall with the first knockout structures defining a first circular knockout structures defining a first circular knockout and a second annular knockout surrounding and containing the first circular knockout, the first and second knockouts having centers spaced apart such that the second knockout is defined in eccentric relation to the first knockout and the first and second knockouts of each knockout structure are adapted to be selectively removed to create a trade size opening for passage of a conduit of either of two sizes through the side wall, and a second knockout structure disposed on the side wall between and spaced apart from the first knockout structures and containing only the first knockout. The housing further has a plurality of the side walls with an opposing pair of the side walls having a plurality of spaced apart complanar mounting ears respectively disposed adjacent opposite ends of the opposing side walls for attachment of a cover plate having corresponding mounting holes or slots to the housing for mounting of a dynamic load to the cover plate.