What does it mean to "knock out" a hole in an electrical box?

"Knocking out" a hole in an electrical box refers to the process of removing a pre-scored section of the box to create an entry point for conduit or wiring. This is an essential step in wiring installations as it allows for the safe and secure passage of electrical conduit into the box, ensuring that the wiring can be adequately connected to the electrical system within the building.

The electrical boxes are often designed with removable sections, known as knockouts, that can be easily removed using a hammer and a screwdriver or a similar tool. Once the knockout is removed, this facilitates not only the entry of conduit but also helps maintain the integrity and safety of the electrical installation by ensuring that connections are housed securely within the box.

Creating a hole for ventilation, strengthening the electrical box, or installing additional wiring do not accurately define the purpose of knocking out a section of an electrical box, as those tasks involve different considerations and goals in electrical installations.