First, determine the size of the missing knockout hole and subtract 3/8" to figure out what size knockout plug you'll need. For example, if you have a 7/8" hole, you'll need a 1/2" knockout plug ...

Google “ ¾ -inch knockout plug,” and loads of possibilities pop up. Knockouts are the places where an electrical box has been punched through to allow for wiring, so connections for outlets ...

Post your thoughts in the box below. All references based on the 1999 edition ... would not comply with Table 110-26. The missing knockout violates NEC rules as well. Section 373-4 requires that any ...