Square D Tandem Breaker

[6768rogues]

I need to install two tandem breakers in my Square D QO panel. I have found two, one has a hook with a snap connector and the other has two snap connectors. The hook type will not work as my panel has no slots in the bar. The tandem with two snaps appears to be the right one, but its packaging says it is for panels manufactured before 1967. My panel was new in 1982.
I checked the breaker slots indicated on the panel directory with dashed lines and they do not have slots. I can find no slots in the attachment bars.

Here are my questions:
Is there a third type of tandem breaker for my panel?
Should I buy the double snap type and hope it works?

Thank you.

 

[Greatbear]

The "two snaps" breaker will fit into late model QO panels, but it's technically illegal to do so, as you'll be adding more branch circuits than the panel is rated for. CTL= circuit limiting. QO panels that have metal support pans with the slots generally are no more than 30 circuits. That being said, I have a couple non-CTL tandems in my QO panels since I had run out of space in one, and another I wanted to split up two low powered branch circuits. You can use these things safely, but a savvy inspector will gig you on it.

 

[ishiboo]

The "two snaps" breaker will fit into late model QO panels, but it's technically illegal to do so, as you'll be adding more branch circuits than the panel is rated for. CTL= circuit limiting. QO panels that have metal support pans with the slots generally are no more than 30 circuits. That being said, I have a couple non-CTL tandems in my QO panels since I had run out of space in one, and another I wanted to split up two low powered branch circuits. You can use these things safely, but a savvy inspector will gig you on it.

Couldn't have said it better myself.

 

[6768rogues]

Thank you, the information you provided makes sense. I have a lot of 15 Amp circuits that do not have much load, so I am confident that I can add a couple of tandems without overtaxing the panel.