Tandem Breaker - Box incompatible?
Hello all. I installed 2 new outlets in garage, each on their own circuit (GFCI protected outlets, 12g THHN in conduit). I wanted to use a tandem breaker so that these two outlets were easy to identify in the box. Upon trying to install the breaker, I think that perhaps my box is not compatible with tandem breakers - or I got the wrong breaker. From what I've read, the bus stabs are not notched, so they are not compatible/allowed to be used with tandems.
Just double checking here. I can get the breaker in, but it doesn't seat all the way, so that's wrong. I've got room to put 2 single pole 20a breakers, so it's not the end of the world, just not what I wanted.
(click image for larger picture - tandem and single pole 15a side-by-side)
http://i60.photobucket.com/albums/h1...801_080541.jpg http://i60.photobucket.com/albums/h1...801_080523.jpg http://i60.photobucket.com/albums/h1...801_080343.jpg http://i60.photobucket.com/albums/h1...801_080224.jpg
What brand box---what do the existing breaker have printed on them---
Square D box, don't know the model (installed in 2002).
Existing breaker is pictured (15a):
Upon further reading, I need to look at the diagram in my box. It is possible that there are slots that allow tandems, they are just all in use by standard breakers.
The box model number should be on the inside of the door.
It will be something similar to
Type 1 Enclosure
The HOMC40UC is no tandems allowed. This should be a lesson in do your homework before buying supplies. Looks like I'll need to go pickup 2 standard 20a breakers.
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