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What does the ``N`` suffix mean for a NQOD442L400CUN Panelboard?

Needs to know the suffix "N" on the NQOD442L400CUN obsoleted Panelboard interior 

Product Line:
NQOD OBS Panelboards

Product Features 

The "N" suffix indicates that the Neutral bar is also Copper, in combination with the "CU" for Copper bussing 

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