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Repair of a Damaged Knock-Out #187427 06/26/09 05:42 PM
Joined: Jan 2005
Posts: 5,316
renosteinke Offline OP
Cat Servant
Member
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]

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?

Tools for Electricians:
Re: Repair of a Damaged Knock-Out [Re: renosteinke] #187429 06/26/09 06:09 PM
Joined: Jul 2004
Posts: 9,571
G
gfretwell Online Content
Member
Bolt a galvanized blank cover over the hole and punch the new hole where you need it.


Greg Fretwell
Re: Repair of a Damaged Knock-Out [Re: renosteinke] #187432 06/26/09 08:53 PM
Joined: Oct 2000
Posts: 3,973
Bill Addiss Offline
Member
[quote=renosteinke]

[Linked Image from i143.photobucket.com]

How do you fix such problems?

Reno,

Try one of these:

[Linked Image]

wink
Bill

Re: Repair of a Damaged Knock-Out [Re: Bill Addiss] #187434 06/26/09 09:00 PM
Joined: Jan 2005
Posts: 5,316
renosteinke Offline OP
Cat Servant
Member
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!

Re: Repair of a Damaged Knock-Out [Re: renosteinke] #187436 06/26/09 09:11 PM
Joined: Oct 2000
Posts: 3,973
Bill Addiss Offline
Member
Originally Posted by renosteinke
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 laugh

Re: Repair of a Damaged Knock-Out [Re: Bill Addiss] #187441 06/26/09 09:44 PM
Joined: Mar 2004
Posts: 947
T
twh Offline
Member
If it's not that bad, I use reducer washers.

Re: Repair of a Damaged Knock-Out [Re: twh] #187506 06/29/09 11:56 AM
Joined: Jan 2005
Posts: 5,316
renosteinke Offline OP
Cat Servant
Member
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]

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!

Re: Repair of a Damaged Knock-Out [Re: renosteinke] #187511 06/29/09 01:40 PM
Joined: Sep 2004
Posts: 68
H
homer Offline
Member
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!

Re: Repair of a Damaged Knock-Out [Re: homer] #187516 06/29/09 07:13 PM
Joined: Apr 2002
Posts: 7,234
HotLine1 Offline
Member
Yes, the 'donuts' (reducing washers) sure help. I even had 3" to 1/2" floating in the shop.



John
Re: Repair of a Damaged Knock-Out [Re: HotLine1] #187838 07/11/09 04:49 AM
Joined: Aug 2007
Posts: 61
TOOL_5150 Offline
Member
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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