On a 125A or 250A NF panelboard how many 125A branch breakers can be placed in this panelboard?

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Issue:
Why can only one 125A/3P branch mounted E frame breaker be installed in a 250A maximum NF panelboard?

Product Line:
NF panelboards

Environment:
Specification/application

Resolution:
The panelboard is limited to 1 branch device rated 125A. The neutral and UL testing are the restrictions on these panels.