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#187427 - 06/26/09 03:42 PM Repair of a Damaged Knock-Out
renosteinke Offline
Cat Servant
Member

Registered: 01/22/05
Posts: 5299
Loc: 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:



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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#187429 - 06/26/09 04:09 PM Re: Repair of a Damaged Knock-Out [Re: renosteinke]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9012
Loc: Estero,Fl,usa
Bolt a galvanized blank cover over the hole and punch the new hole where you need it.
_________________________
Greg Fretwell

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#187432 - 06/26/09 06:53 PM Re: Repair of a Damaged Knock-Out [Re: renosteinke]
Bill Addiss Offline
Member

Registered: 10/07/00
Posts: 4196
Loc: NY, USA
[quote=renosteinke]



How do you fix such problems?

Reno,

Try one of these:



wink
Bill

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#187434 - 06/26/09 07:00 PM Re: Repair of a Damaged Knock-Out [Re: Bill Addiss]
renosteinke Offline
Cat Servant
Member

Registered: 01/22/05
Posts: 5299
Loc: 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!

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#187436 - 06/26/09 07:11 PM Re: Repair of a Damaged Knock-Out [Re: renosteinke]
Bill Addiss Offline
Member

Registered: 10/07/00
Posts: 4196
Loc: 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

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#187441 - 06/26/09 07:44 PM Re: Repair of a Damaged Knock-Out [Re: Bill Addiss]
twh Offline
Member

Registered: 03/11/04
Posts: 892
Loc: Regina, Sask.
If it's not that bad, I use reducer washers.

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#187506 - 06/29/09 09:56 AM Re: Repair of a Damaged Knock-Out [Re: twh]
renosteinke Offline
Cat Servant
Member

Registered: 01/22/05
Posts: 5299
Loc: 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:



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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#187511 - 06/29/09 11:40 AM Re: Repair of a Damaged Knock-Out [Re: renosteinke]
homer Offline
Member

Registered: 09/30/04
Posts: 68
Loc: 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!

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#187516 - 06/29/09 05:13 PM Re: Repair of a Damaged Knock-Out [Re: homer]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6785
Loc: Brick, NJ USA
Yes, the 'donuts' (reducing washers) sure help. I even had 3" to 1/2" floating in the shop.
_________________________
John

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#187838 - 07/11/09 02:49 AM Re: Repair of a Damaged Knock-Out [Re: HotLine1]
TOOL_5150 Offline
Member

Registered: 08/01/07
Posts: 62
Loc: 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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