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Why are the NQOD panels provided with copper interiors on the 400A and above when it is in a NEMA 3R,5,12 enclosure?

Why did Square D only build 400A NQOD panels with copper interiors when installed in N3R enclosures?

Product Line:

NQOD panelboard

We use copper interiors on 400A NEMA 3R,5,12 panels due to the heat rise on the 400A panels in non-vented enclosures.

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