I am removing my #4 romex feeding my sub panel due to suggestions on here. When I removed the main panel end, I discovered the knockout in only one inch and I planned on installing 1 1/4 inch conduit. Can I just drill out to the proper size with a hole saw? The other knockouts are difficult if not impossible to get to.
Is making a knockout bigger allowable?
Dec 03, 2009
3 Replies
Yes, normally you use a punch for this. It has a cutter and die that are pulled together by cranking down a bolt and it slices a nice neat hole.
Yes you can make it bigger. To use a hole saw you'll need a couple of C-clamps and a piece of wood. Clamp the wood inside the panel covering the existing knockout hole. Having the wood there gives the hole saw pilot bit a place to hold onto.
Or use a proper Greenlee punch. ...Jim Thompson
Join the Discussion
Have something to add? Share your thoughts — no account required.
Didn't find your answer?
Ask the community — no account required