ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
High current GFI vs regular GFCI
by HotLine1. 11/16/18 01:03 PM
This anti-theist is priceless!!!
by djk. 11/14/18 07:19 AM
Single phase and what you call it.
by dsk. 11/12/18 11:10 AM
220/230/240V 60Hz Systems
by Albert. 11/07/18 12:48 AM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 29 guests, and 24 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
Repair of a Damaged Knock-Out #187427
06/26/09 05:42 PM
06/26/09 05:42 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 06:09 PM
06/26/09 06:09 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,302
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 08:53 PM
06/26/09 08:53 PM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,903
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 09:00 PM
06/26/09 09:00 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 09:11 PM
06/26/09 09:11 PM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,903
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 09:44 PM
06/26/09 09:44 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 11:56 AM
06/29/09 11:56 AM
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 01:40 PM
06/29/09 01:40 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 07:13 PM
06/29/09 07:13 PM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 7,039
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 04:49 AM
07/11/09 04:49 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.
Page 1 of 2 1 2

Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
mxslick
mxslick
Atomic City, ID USA
Posts: 803
Joined: October 2004
Show All Member Profiles 
Top Posters(30 Days)
Admin 8
Popular Topics(Views)
251,518 Are you busy
188,690 Re: Forum
178,391 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.066s Queries: 16 (0.006s) Memory: 1.0280 MB (Peak: 1.2101 MB) Zlib enabled. Server Time: 2018-11-17 02:34:02 UTC