I'm fishing 14/2 wires through some electrical boxes (outlets, and switch boxes), that all ready has wires in it. I'm not hooking it up to the electric, I am just fishing the wire, and waiting on the electrician to hook up elec.I never fished before. I did check housing codes, and what wire to use. They told me to keep old wires, and fish the new. Do I punch another hole in the old box to add more wires in it? Any other tips?

  • Are these boxes metal or plastic? How large are they, and how many wires do they have in them already? Mar 15, 2020 at 22:49

1 Answer 1


To just answer your question, yes you can punch out a knockout to add new cable to a metal junction box. You will need a connector similar to the one below to secure the cable in the box. There are certain limits on how many wires you can run into a box so you'd have to check on that with whoever is assisting you in this. If you're running wire into a plastic box, there are tabs you can bend in to insert the wires, no additional connectors are required.

enter image description here

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.