May 20, 2019 · A knockout that is opened but not used for wiring installation—with an NM-connector or conduit connection that closes it—becomes an opening to the outside that would allow an arcing inside the panel to escape and start a fire.

Jan 22, 2025 · With the right information and technique, you should be able to remove a "KO" from electrical panels and other electrical enclosures without any problems. Ensure that the wire/wires you're going to be dealing with are not powered.

Dec 27, 2014 · Electrical panels are designed to safely contain electrical connections, circuits, and switches. When knockouts – the pre-cut metal discs that allow for the installation of additional breakers or conduits – are missing, it leaves an open pathway.

Oct 5, 2015 · As home inspectors we see them all the time ”unused openings” in electrical boxes and electric panels (panelboards) that should always be covered. These openings create potential shock hazards, they might not properly contain a fire that could occur within the box, and can admit unwanted visitors such as mice.

In this tutorial, we'll show you how to remove knockouts from QO™ and Homeline Load Centers, allowing for smooth installation of the main wiring and branch load wiring. ...more.

May 27, 2017 · Knock Outs. Look for other unused openings on the sides, top and bottom of all electrical panels as well. Sometime unused round holes, called knockouts, are not covered. You can also purchase what are known as knock out plugs or knock out seals to easily cover these holes. Again, duct tape is not the answer. Keep Panels Clean

perhaps it’s a missing “knockout” plug on the side of an electrical box. Or, you may occasionally come across an open hole in the face of an electrical breaker panel where one or more electrical breakers

Mar 13, 2013 · One of the most common Truth-in-Housing repair items is an unfilled opening in an electrical box or panelboard. If you walk through the garage or basement of just about any old Minneapolis or...

Jun 28, 2010 · If there is a knockout available for use, the beginning step to remove the knockout is to first remove the door to the breaker box. By removing the door to the panel, you can gain better access to the breaker box and prevent the door from inhibiting your reach.

Nov 24, 2024 · Reducing washers and knockout seals can be purchased online or at almost any local electrical supply company. The cut concentric knockout ring can be easily removed. The knockouts on a load center cover tend to be much easier to remove to …