Illumination – Automatic substitution of power supply or light source
Patent
1992-02-27
1992-12-29
Dority, Carroll B.
Illumination
Automatic substitution of power supply or light source
362148, 362150, F21V 1904
Patent
active
051746425
ABSTRACT:
A remote ballast assembly is disclosed for suspending a lighting fixture from a drop ceiling which forms the bottom boundary of a recessed plenum. The recessed plenum or ceiling cavity is typically bounded by a plurality of spaced apart cross members which form a support grid for the drop ceiling. The remote ballast assembly comprises a housing, a junction box, a bracket, a transformer, and a relay. The housing engages the cross members which define the recessed plenum to support the housing in the recessed plenum. The junction box is affixed to the housing proximate an opening in the housing, and the bracket is affixed to the junction box. The bracket includes a hook which engages a loop bracket on the lighting fixture to thereby suspend the lighting fixture in a vertical position, regardless of the orientation of the housing. The transformer is mounted to the housing, and provides electrical power from a remote source to the primary lamp during normal operation. The relay is normally open, but closes a circuit to provide electrical power to the secondary lamp when electrical power to the primary lamp is interrupted.
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Holoplane Industrial Lighting Products Digest HL/693, 20 pages, Sep. 1991.
Brohard Bonnie J.
McCartney John C.
Dority Carroll B.
Hollophane Company, Inc.
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