Knockout arrangement providing connection pattern choice on elec

Details Knockout arrangement providing connection pattern choice on elec Knockout arrangement providing connection pattern choice on elec

1996-08-22

1998-03-17

Kincaid, Kristine L.

Electricity: conductors and insulators

Conduits, cables or conductors

Single duct conduits

H02G 310

Patent

active

057289735

ABSTRACT:
A knockout arrangement for an electrical junction box includes a housing having at least one side wall being substantially planar, a pair of spaced apart first knockout structures on the side wall with the first 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 coplanar 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.

REFERENCES:
patent: 946646 (1910-01-01), Pratt
patent: 3349946 (1967-10-01), Lee
patent: 3369071 (1968-02-01), Tuisku
patent: 4032030 (1977-06-01), Bass et al.
patent: 4051322 (1977-09-01), Park
patent: 4229614 (1980-10-01), Smolik
patent: 4922056 (1990-05-01), Larsson
patent: 5066832 (1991-11-01), Clarey et al.
patent: 5191171 (1993-03-01), Bordwell
patent: 5280132 (1994-01-01), Clarey et al.

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