Go Back   InterNACHI Inspection Forum > >

Notices

Electrical Inspections Contains discussions about electrical systems. This includes receptacles, panels, wiring, etc.

Reply
 
Thread Tools
  #1  
Old 2/13/13, 4:54 PM
Michael Roberson's Avatar
Michael Roberson Michael Roberson is offline
Certified Professional Inspector (CPI) ®
 
Join Date: May 2008
Location: West Michigan, Lower Penninsula
Posts: 1,917
Default Doubler limit in panel?

I seem to rememeber a limit of 6 for the amount of Criciut breaker doublers that could be used in a panel. Does anyone have a reference conferming or denying? Thanks.
Attached Thumbnails
Doubler limit in panel?-dscf3307-jpg  
Reply With Quote
Need a home inspection in Texas? Check out InterNACHI's listing of Texas certified home inspectors. Or, find a home inspector anywhere in the world with our inspection search engine.
  #2  
Old 2/13/13, 4:59 PM
Robert Meier's Avatar
Robert Meier Robert Meier is online now
Active Poster
 
Join Date: Feb 2010
Location: New Jersey
Posts: 3,247
Please Note: Robert Meier is a non-member guest and is in no way affiliated with InterNACHI or its members.
Default Re: Doubler limit in panel?

The label on the cover should show that information. Looks like a 40 circuit panel currently with 39 circuits in it.
Reply With Quote
  #3  
Old 2/13/13, 5:45 PM
Jim Port Jim Port is offline
Unmoderated Guest
 
Join Date: Jul 2007
Location: Maryland
Posts: 2,631
Please Note: Jim Port is a non-member guest and is in no way affiliated with InterNACHI or its members.
Default Re: Doubler limit in panel?

Some panels do not allow tandems. Check the label.
Reply With Quote
  #4  
Old 2/13/13, 5:48 PM
Robert Meier's Avatar
Robert Meier Robert Meier is online now
Active Poster
 
Join Date: Feb 2010
Location: New Jersey
Posts: 3,247
Please Note: Robert Meier is a non-member guest and is in no way affiliated with InterNACHI or its members.
Default Re: Doubler limit in panel?

Sq D Homeline panels should have a rejection feature where you cannot install more twin breakers than the panel is listed for.
Reply With Quote
  #5  
Old 2/13/13, 6:12 PM
Glenn Fricke's Avatar
Glenn Fricke Glenn Fricke is offline
Certified Professional Inspector (CPI)
 
Join Date: Jun 2010
Location: Saint Petersburg, FL
Posts: 1,003
Default Re: Doubler limit in panel?

Always check the legend on the panel door or inside for which circuits allow doubling. Sometimes the legend is hidden, which in that case can only recommend electrician evaluate.




Glenn Fricke
DG Construction & Inspections

www.mystpetersburghomeinspector.com
www.dgciflorida.com
www.florida-home-inspector.us
www.dgconcierge.com
www.savvyagenttampabay.com
www.pestcontrolstpetersburg.com

Home Inspections in St Petersburg, Tampa, Clearwater, Florida

Pest Control in St Petersburg, Florida

dgciflorida@hotmail.com

727-642-2793
Reply With Quote
  #6  
Old 2/13/13, 6:28 PM
Robert Meier's Avatar
Robert Meier Robert Meier is online now
Active Poster
 
Join Date: Feb 2010
Location: New Jersey
Posts: 3,247
Please Note: Robert Meier is a non-member guest and is in no way affiliated with InterNACHI or its members.
Default Re: Doubler limit in panel?

And while you're looking at the manufacturer's label take a photo of it too.
Reply With Quote
  #7  
Old 2/13/13, 9:17 PM
Jim Port Jim Port is offline
Unmoderated Guest
 
Join Date: Jul 2007
Location: Maryland
Posts: 2,631
Please Note: Jim Port is a non-member guest and is in no way affiliated with InterNACHI or its members.
Default Re: Doubler limit in panel?

Quote:
Originally Posted by Robert Meier View Post
Sq D Homeline panels should have a rejection feature where you cannot install more twin breakers than the panel is listed for.
Unless someone uses non-ctl breakers.
Reply With Quote
  #8  
Old 2/13/13, 11:09 PM
Jeff Hannon Jeff Hannon is offline
InterNACHI Member
 
Join Date: Jan 2013
Location: Delanson, NY
Posts: 614
Default Re: Doubler limit in panel?

There are rejection clips on the back of approved ctl breakers that limit their use to ctl approved slots only. The only problem is that they can be snapped off and then be inserted into any slot.
Back to the original question. There is nothing in the NEC code that I can find that limits the number of tandem breakers to six. There used to be a limit of 42 circuits in a main panel enclosure but that went away in '08. The enclosure must be UL listed for ctl breakers and the panel schematic will show the approved slot locations for tandem breakers.
Here is another StructureTech article that does a great job explaining this with great photos.http://www.startribune.com/local/you...140688183.html

Last edited by jhannon; 2/14/13 at 11:06 AM..
Reply With Quote
  #9  
Old 2/14/13, 4:53 AM
Robert Meier's Avatar
Robert Meier Robert Meier is online now
Active Poster
 
Join Date: Feb 2010
Location: New Jersey
Posts: 3,247
Please Note: Robert Meier is a non-member guest and is in no way affiliated with InterNACHI or its members.
Default Re: Doubler limit in panel?

Quote:
Originally Posted by Jim Port View Post
Unless someone uses non-ctl breakers.
Since this is Homeline panel I'm guessing that there no such thing as a Homeline non-CTL replacement CB. If I remember correctly the Homeline series was introduced after the CTL only listing for panelboards came about. I don't believe that Sq D actually makes a non-CTL Homeline CB but I could be wrong.
Reply With Quote
  #10  
Old 2/14/13, 12:34 PM
Jeffrey R. Wicklander's Avatar
Jeffrey R. Wicklander Jeffrey R. Wicklander is offline
Certified Professional Inspector (CPI)
 
Join Date: Mar 2008
Location: Lake Forest, Il
Posts: 1,960
Default Re: Doubler limit in panel?

That QO panel is most likely a 30/40.


Jeff



Jeff Wicklander
Corwick Home Services

Join my business on Facebook
Reply With Quote
  #11  
Old 2/14/13, 4:39 PM
Michael Roberson's Avatar
Michael Roberson Michael Roberson is offline
Certified Professional Inspector (CPI) ®
 
Join Date: May 2008
Location: West Michigan, Lower Penninsula
Posts: 1,917
Default Re: Doubler limit in panel?

Thanks guys.
Reply With Quote
  #12  
Old 2/14/13, 4:50 PM
Robert Meier's Avatar
Robert Meier Robert Meier is online now
Active Poster
 
Join Date: Feb 2010
Location: New Jersey
Posts: 3,247
Please Note: Robert Meier is a non-member guest and is in no way affiliated with InterNACHI or its members.
Default Re: Doubler limit in panel?

Quote:
Originally Posted by jwicklander View Post
That QO panel is most likely a 30/40.


Jeff
I know the photo is blurry but look again, those are not QO CB's.
Reply With Quote
  #13  
Old 2/14/13, 9:47 PM
Jim Port Jim Port is offline
Unmoderated Guest
 
Join Date: Jul 2007
Location: Maryland
Posts: 2,631
Please Note: Jim Port is a non-member guest and is in no way affiliated with InterNACHI or its members.
Default Re: Doubler limit in panel?

Definitely Square D Homeline.
Reply With Quote
Need a home inspection in Texas? Check out InterNACHI's listing of Texas certified home inspectors. Or, find a home inspector anywhere in the world with our inspection search engine.
  #14  
Old 2/15/13, 1:42 PM
Jeffrey R. Wicklander's Avatar
Jeffrey R. Wicklander Jeffrey R. Wicklander is offline
Certified Professional Inspector (CPI)
 
Join Date: Mar 2008
Location: Lake Forest, Il
Posts: 1,960
Default Re: Doubler limit in panel?

Quote:
Originally Posted by Robert Meier View Post
I know the photo is blurry but look again, those are not QO CB's.
Oops...you're right. Thought I saw windows.

Jeff



Jeff Wicklander
Corwick Home Services

Join my business on Facebook
Reply With Quote
  #15  
Old 2/18/13, 7:10 PM
John Allingham John Allingham is offline
InterNACHI Member
 
Join Date: Jun 2004
Location: Milton, ON
Posts: 779
Default Re: Doubler limit in panel?

I don't think we use the term "doublers" up here. What do you mean?
Is it a breaker controlling a multi-wire circuit?
Reply With Quote
Reply

Thread Tools

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Evaluating your home's wiring system mcyr Electrical Inspections 2 8/13/13 8:00 PM
Main Panel or not? tgreenwald Miscellaneous Discussion for Inspectors 0 12/20/12 12:20 AM
National Electrical Code Information and Discussion jtedesco1 Electrical Inspections 50 6/15/10 7:28 PM
Subpanel wired as main panel. jlybolt Electrical Inspections 15 5/23/07 4:10 PM
Bad electrical problem Pest Guy Electrical Inspections 4 1/20/06 9:26 PM

All times are GMT -4. The time now is 4:18 PM.
no new posts