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Joined: Jan 2005
Posts: 5,316
OP
Cat Servant Member
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We've all had it happen. We're quite happily making just the right hole in just the right place, when one of those pre-punched KO's breaks free. We're left with a big hole to fix. It often looks something like this: ![[Linked Image from i143.photobucket.com]](https://i143.photobucket.com/albums/r138/renosteinke/KOOops.jpg) There are a number of reasons we don't want to leave that hole open. If nothing else, we don't want a colony of wasps to set up housekeeping in the panel. How do you fix such problems?
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Joined: Jul 2004
Posts: 9,673 Likes: 7
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Bolt a galvanized blank cover over the hole and punch the new hole where you need it.
Greg Fretwell
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Joined: Oct 2000
Posts: 4,042 Likes: 3
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[quote=renosteinke] How do you fix such problems? Reno, Try one of these: ![[Linked Image]](https://www.electrical-contractor.net/Forum/Images/Mickey-KO.gif)  Bill
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Joined: Jan 2005
Posts: 5,316
OP
Cat Servant Member
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Ha! I love it Bill.
Our trade has all manner of special parts: batwings, battleship clips, azholes ..... what we need is more 'Mickey Mouse' stuff!
BTW, I'm honored ... I don't think I've ever seen Bill respond to a picture thread!
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Joined: Oct 2000
Posts: 4,042 Likes: 3
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BTW, I'm honored ... I don't think I've ever seen Bill respond to a picture thread! Yes, It's been awhile... I couldn't resist this one 
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Joined: Mar 2004
Posts: 947
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If it's not that bad, I use reducer washers.
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Joined: Jan 2005
Posts: 5,316
OP
Cat Servant Member
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I was surprised to learn that the parts house actually had reducing washers for 2-1/2" pipe. I was also pleased when I was able to trim the washers with my aviation snips. Here's the result: ![[Linked Image from i143.photobucket.com]](https://i143.photobucket.com/albums/r138/renosteinke/KOrepair.jpg) Now, this is not the first time I've had to deal with this issue. I was hoping for a better solution - or, perhaps, some trick to prevent it from happening in the first place. The longer I'm in the trade, the less I like those pre-punched KO's!
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Joined: Sep 2004
Posts: 68
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Reno,
Prepunched k.o.'s probably cost more labor time over the years than any other annoying thing. Most electricians would agree with you that they offer little benefit especially when using strut to support conduits.
The handiest method to blank off k.o.'s I have found is to use a 4" square blank or other piece of code gage metal bolted over the knockout. Good idea on the reducing washer too!
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Joined: Apr 2002
Posts: 7,283 Likes: 3
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Yes, the 'donuts' (reducing washers) sure help. I even had 3" to 1/2" floating in the shop.
John
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Joined: Aug 2007
Posts: 61
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Here, we call the reducing washers chinese money.
BTW.. your fix is the same way I would do it.
~Matt
I would rather beg for forgiveness then beg for permission.
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Posts: 44
Joined: July 2013
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