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An "old work" electrical box is designed to be installed neatly through a finished wall or ceiling. Why was an Old Work Electrical Box Used in New Construction?įirst, why was this type of "old work" electrical box used in the first place, rather than installing an electrical box securely fastened to the ceiling framing? After all the light fixture had been installed during new construction. The swing clamp was broken by over-tightening of the clamp screw. Below you can see one of the broken-off swing clamp remains. This allowed the box to loosen and ultimately to fall from the ceiling where it remained hanging by its wires.
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The swing clamp screws were so over-tightened against the drywall ceiling that all three of them cracked and two broke off completely.Ī closer inspection of the original blue plastic electrical box to which the light fixture had been mounted discovered that two of the three plastic clips or "ears" intended to connect the electrical box to the ceiling drywall had snapped off.
The concern is that the weight of a light fixture may pull the swing clips through the drywall or cause it to break, or the weight or movement of a heavy light fixture or ceiling fan may cause the swing clips themselves to break.Ī falling light fixture or fan can kill someone or could start a building fire.īut this light fixture installation failed for a different reason: the swing clamps were tightened using a high-speed and powerful battery-operated drill mounted with a phillips bit to speed the fixture installation. Watch out: The round Carlon B618R electrical box used for the original light installation was a Carlon 4 1/4" diameter electrical box that is specifically indicated by the manufacturer as not for fixture support in the ceiling. The bathroom ceiling light shown above was found one morning hanging by its electrical wires: the plastic electrical box from which the light fixture was suspended was itself falling out of the ceiling - a dangerous situation risking fire or shock, more-so for a light fixture suspended over a bathroom sink.
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How to fix a loose, broken or damaged plastic electrical box falling out of place Cause of Ceiling Light Fixture Support Box Failure We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.
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The electrical box repair or replacement procedures described in this article series describes step by step repairs for both metal and plastic electrical boxes used in building electrical wiring systems. We discuss the requirement for secure mounting of ceiling electrical boxes for fans and lights and we give step by step details for installing a replacement electrical box, insulating around it, connecting the ceiling light wires, and then testing and completing the installation. In the second part of this article, "Ceiling Light Fixture Installation" we use an "old work" electrical box to replace the damaged box, secure the new box and re-mount the light fixture safely. This article describes how to repair a ceiling light fixture electrical box that was falling out of the ceiling, beginning with an explanation of how and why broken plastic electrical box swing clamp supports allowed the electrical box to fall from the ceiling leaving the light fixture hanging by its electrical wires. Repair a broken plastic electrical box mounted in a ceiling or wall
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