QO non-CTL vs QOT CTL tandem circuit breakers

[marmathsen]

I'm hoping to get some clarification on what is allowed for QO non-CTL (snap on, no hook) circuit breakers. As I understand it, the requirement is still that you need to know what type of tandem breaker was allowed in a given panel at the time it was listed, correct?

Is that still the case?

Has anything changed in recent years with QO? Like how Eaton has all together replaced the BD tandem breakers with BR tandems.

Are you allowed to use a QO non-CTL in any spot in an older non-CTL panel?

Are you allowed to use a non-CTL breaker in a CTL panel that is designed for the QOT hook style? If so, can you use any space in the panel or only the spaces designed for the hooks, and are you limited to the maximum circuits in the listing (or part number)?

I should know this but I see on Schneider's website that many of the load center's don't allow twice as many circuits as there are spaces but they list the non-CTL tandems as compatible. So is there some means that they limit the number of non-CTL (snap on, no hook) tandems you can put in a panel?

Obviously on a CTL panel you can look at the rail or on the label to determine if you can/need to install the CTL hook style. Is there an easy way to look at the an older panel to determine if it allows non-CTL tandems or if it's only listed for full sized circuit breakers? Looking over previous threads it seems unclear how determine what is or isn't allowed to be installed.

Appreciate any help or inside you can provide

Rob G
Seattle

 

[curt swartz]

You still need to follow the label on the loadcenter that show where, if any tandem breakers can be installed. SquareD still makes may loadcenters that have limited locations for tandem breakers.

 

[infinity]

Maybe Square D will eventually follow Eaton and ditch the entire CTL versus non-CTL nonsense. With Eaton you just follow the number of breakers permitted on the panel label. I see them using 20/40, 30/60, 40/80, etc.

 

[Birken Vogt]

The clip style QO tandems are much more expensive than the hook style. Hopefully that goes away eventually.

 

[letgomywago]

The clip style QO tandems are much more expensive than the hook style. Hopefully that goes away eventually.

Doubt it. Eaton just is selling less of the CTL style. Have to go to home depot to get them same day. Supplier have non ctl and its at the non CTL price.

Since the 42 circuit limit has been gone i haven't worried much about this issue so long as my load calc hasn't been too high. I dont like making out panels either though.