Square D panel doesn't take twins, but mfg says yes

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Stevenfyeager

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United States, Indiana
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electrical contractor
A square D QO panel supplier says it takes twins, but they don't fit. People for years have tried to make them fit in this panel. They simply do not. A 225 amp panel, cat no. NQODQ2. Probably a 40 year old panel. Anyone else have this problem? Thank you
 
norcal said:
If older then 40 years it may require the use of non-CTL twins.
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I agree.

Non-CTL tandem breakers have no rejection feature and will plug onto any space, new or old panel.

Technically the Non-CTL's still sold are only supposed to be used as replacements for existing Non-CTL breakers.
 
kwired said:
I agree.

Non-CTL tandem breakers have no rejection feature and will plug onto any space, new or old panel.

Technically the Non-CTL's still sold are only supposed to be used as replacements for existing Non-CTL breakers.
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I called Schneider Elec, an online Square D supplier, (I couldn't find a Square D site). They assured me that this model panelboard does not accept twins. They said only their QO load centers do.
 
Stevenfyeager said:
I called Schneider Elec, an online Square D supplier, (I couldn't find a Square D site). They assured me that this model panelboard does not accept twins. They said only their QO load centers do.
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Schneider is a huge organization and sells things globally, they acquired Square D which was a North American company, still kept the Square D name for majority of the product lines that originated as Square D products.

Non CTL tandem QO breakers fit any panel that accepts plug on QO breakers.

Probably true that most if not all "panelboards" will not accept a class CTL tandem breaker.

You only saw a limited number of "loadcenters" that would accept them, until after the 42 circuit rule was eliminated from code, now you find 42 space loadcenters that will accept tandems in all 42 spaces - but with AFCI requirements you generally don't use any tandems anyway as they only come in full space frames.
 
NQO and NQOD panels are "panelboards", meaning intended for commercial / industrial use, as opposed to "load centers" which are less expensively constructed, but intended for residential use. In Scheider / Sq. D world, load centers are going to start with "QO", no "N" in front and QOT tandem breakers are ONLY allowed to be installed in load centers, not panelboards. NQO panels were not built with the special provisions that allow QOT breakers to connect to the bus. Everything else QO related are interchangeable, just not that.

https://www.schneider-electric.us/e...cale=en_US&searchid=1511113028515#__highlight
 
Jraef said:
NQO and NQOD panels are "panelboards", meaning intended for commercial / industrial use, as opposed to "load centers" which are less expensively constructed, but intended for residential use. In Scheider / Sq. D world, load centers are going to start with "QO", no "N" in front and QOT tandem breakers are ONLY allowed to be installed in load centers, not panelboards. NQO panels were not built with the special provisions that allow QOT breakers to connect to the bus. Everything else QO related are interchangeable, just not that.

https://www.schneider-electric.us/e...cale=en_US&searchid=1511113028515#__highlight
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Except QOB breakers won't work in "loadcenters"
 
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