Go Back  DoItYourself.com Community Forums > Electrical, AC & DC. Electronic Equipment and Computers > Electrical - AC & DC
Reload this Page >

Can you drill holes in electrical panel where there are no knockouts?

Can you drill holes in electrical panel where there are no knockouts?

Reply

  #1  
Old 01-23-18, 11:00 AM
S
Member
Thread Starter
Join Date: Jul 2009
Location: Ca
Posts: 226
Received 0 Votes on 0 Posts
Can you drill holes in electrical panel where there are no knockouts?

I am still working on my panel upgrade. Yes, I know still! One problem I am having is the knockouts lining up between the meter main breaker panel and the distribution panel on the inside of the wall. I have the knockout in the prefect place in the distribution panel but there is not one on the outside meter panel. Can I just drill the hole in the panel or do I have to line up the knockouts?

skeeter
 
Sponsored Links
  #2  
Old 01-23-18, 11:43 AM
core's Avatar
Member
Join Date: Jan 2007
Location: Des Moines, IA
Posts: 1,127
Received 0 Votes on 0 Posts
The NEC does not prohibit you from drilling holes in a panel as long as it is done in a workmanlike manner, and as long as you don't end up with openings when you are done. If your drill hole is going to overlap an existing knockout you may have issues that need addressing, but otherwise it's clean/easy.

Many commercial panels don't come with pre-punched KOs, so if you couldn't drill holes you could never wire anything. Also the manufacturers of knockout sets would be sad ponies.
 
  #3  
Old 01-23-18, 11:53 AM
ray2047's Avatar
Member
Join Date: Mar 2006
Location: USA
Posts: 33,597
Received 13 Votes on 11 Posts
Chassi punches are also a good way.
 
  #4  
Old 01-23-18, 01:17 PM
S
Member
Thread Starter
Join Date: Jul 2009
Location: Ca
Posts: 226
Received 0 Votes on 0 Posts
Good to know, thanks. It will make the job a lot easier.

skeeter
 
  #5  
Old 01-23-18, 02:36 PM
J
Member
Join Date: Jan 2011
Location: USA
Posts: 4,798
Received 75 Votes on 70 Posts
I use a step drill for this job, makes a clean hole, and it can be used for other jobs.
 
  #6  
Old 01-23-18, 05:27 PM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 15,144
Received 84 Votes on 72 Posts
An offset nipple may help also.
 
  #7  
Old 01-23-18, 06:44 PM
S
Member
Thread Starter
Join Date: Jul 2009
Location: Ca
Posts: 226
Received 0 Votes on 0 Posts
Step drills are great for smaller holes in sheet metal or plastic, but I will probably use a hole saw since I need a hole for 2-2.5 in. conduit. Offset nipple won't work in this situation since there is no hole in area I need one.

skeeter
 
  #8  
Old 01-23-18, 06:53 PM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 15,144
Received 84 Votes on 72 Posts
I thought maybe the hole just didn't line up.
 
  #9  
Old 01-23-18, 07:32 PM
CasualJoe's Avatar
Member
Join Date: Jan 2010
Location: United States
Posts: 10,640
Received 85 Votes on 75 Posts
Step drills are great for smaller holes in sheet metal or plastic, but I will probably use a hole saw since I need a hole for 2-2.5 in. conduit.

A hole saw will work, but the hole may be a little rough. This is what knockout punches are made for.
 
  #10  
Old 01-23-18, 08:06 PM
S
Member
Thread Starter
Join Date: Jul 2009
Location: Ca
Posts: 226
Received 0 Votes on 0 Posts
Yeah, Hole saws are rough. I will have to deburr it. Knockout punches are great but a bit overpriced since I only have to do one hole. And I already have a hole saw.

skeeter
 
  #11  
Old 01-24-18, 01:57 AM
core's Avatar
Member
Join Date: Jan 2007
Location: Des Moines, IA
Posts: 1,127
Received 0 Votes on 0 Posts
Knockout punches are great but a bit overpriced
My set from Harbor Freight was $24 as I recall. Chinese made, but what isn't these days. The box is labeled "Knock Metal Set", and the other markings on the box leave a person wondering if they're getting a knockout punch set or a couple tickets to a pro wrestling match. But they work fine.
 
  #12  
Old 01-24-18, 05:42 AM
ray2047's Avatar
Member
Join Date: Mar 2006
Location: USA
Posts: 33,597
Received 13 Votes on 11 Posts
It is best to start with a good quality never used hole saw. That cost could be over $15 (not including arbour) so cost of a cheap K/O punch could be similar.
 
Reply
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: