Is this box rated to take tandem breakers


Old 11-22-10, 07:13 AM
Thread Starter
Join Date: Feb 2010
Location: usa
Posts: 38
Is this box rated to take tandem breakers

Title says it all: is this box rated to accommodate tandem breakers (or whatever the term is for breakers with two circuit in one breaker-slot)?

Square D company
Sponsored Links
Old 11-22-10, 07:23 AM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 14,359
The part number we need would be something like QO100M2030.

Last edited by pcboss; 11-23-10 at 05:14 AM.
Old 11-22-10, 06:56 PM
Join Date: Mar 2006
Location: NE Wis / Paris France{ In France for now }
Posts: 4,808
To find the model of this load centre you will have to take the cover off and look for the label on the tub itself useally the left side if the main breaker is top but if main breaker is bottom then it will be on the right side but few case it will revesed the locations.

Once you find the model number and post it up here then we will go from there.

Old 11-29-10, 07:50 AM
Thread Starter
Join Date: Feb 2010
Location: usa
Posts: 38
The only thing that resembles a model number is "series 1"
Nonetheless, I figured it out: as a pre-nineteen-sixty-something box, it does not have circuit limiting pan-rail slots, so it takes the QO (e.g. QO2020) line of tandem breakers rather than the QOT line that the newer boxes with pan-rail slots take (e.g. QOT2020*) . These can be found on ebay.

The only thing I don't get is that the house was built in 1958: Doesn't that predate the Square D QO products by a few years?
Old 11-29-10, 09:28 AM
Forum Topic Moderator
Join Date: Feb 2005
Location: Near Lansing, Michigan
Posts: 10,295
Maybe somebody replaced an original fuse panel at some point? Breakers in 1960 residential would be a rare find compared to Edison base fuses.
Old 12-02-10, 01:32 PM
Thread Starter
Join Date: Feb 2010
Location: usa
Posts: 38
I learned that the Square D QO product line was released in 1955. They would have been, like, brand-spankin'-new technology when this house was built in 1958. You know, it is really impressive to say that it is still in use (and works as well as the day it went in) over fifty years later

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
Display Modes