I recently had an existing old work box (metallic, installed with the supports that look like 'F') where there was a cable coming in from the top and another from the bottom. I wanted to add a third cable from the back of the box. So I took my trusty hammer and screwdriver, aimed the screwdriver at the part of the back knockout away from the tab, smacked it, and broke the box tabs right through the drywall... :(.
Once the box was out of the wall, it was still pretty much impossible to knock out the knockout from the inside of the box. I then flipped it around and tried from the back and it came out super easily.
- Are knockouts typically "one direction only"?
- Is there a different way to get them out in a situation like this? Or is it standard to have to take the existing cables out, the box out, punch them out, then put everything back together?