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Will a QO420L125, Series G1, load center accept QOT tandem breakers?

Issue:
Application of tandem breakers

Product Line:
QO Load Center

Environment:
QO Load Center

Cause:
Clarification of product feature

Resolution:
No, this load center was not designed to accept QOT tandem breakers. Since this load center was manufactured after Class CTL requirements were instituted in 1965, QO tandem breakers could not be used, either.

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