What knockout means
A knockout is a partly punched disc in a metal box or panel that is removed to make a hole for a cable clamp or conduit fitting.
Also called KO.
Where it matters on a electrical job
An open knockout left without a fitting or a blank is an easy inspection ding. Carry knockout seals for the ones you open by mistake.
Work it out
- Licensing: Electrical license rules by state
- Tools, templates and guides: Free electrical resources