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

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 07:09 PM
06/26/09 07:09 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,289
Estero,Fl,usa
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 09:53 PM
06/26/09 09:53 PM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,902
NY, USA
[quote=renosteinke]

[Linked Image]

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 10:00 PM
06/26/09 10:00 PM
renosteinke  Offline OP
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
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 10:11 PM
06/26/09 10:11 PM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,902
NY, USA
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 10:44 PM
06/26/09 10:44 PM
T
twh  Offline
Member
Joined: Mar 2004
Posts: 947
Regina, Sask.
If it's not that bad, I use reducer washers.

Re: Repair of a Damaged Knock-Out [Re: twh] #187506
06/29/09 12:56 PM
06/29/09 12:56 PM
renosteinke  Offline OP
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
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]

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 02:40 PM
06/29/09 02:40 PM
H
homer  Offline
Member
Joined: Sep 2004
Posts: 68
Vancouver, WA, USA
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 08:13 PM
06/29/09 08:13 PM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 7,024
Brick, NJ USA
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 05:49 AM
07/11/09 05:49 AM
TOOL_5150  Offline
Member
Joined: Aug 2007
Posts: 61
Bay Area
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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