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What does the D9 suffix on the end of MH enclosure catalog number mean?

Issue:
With NQ, NF panel MH boxes, what does the D9 numbers represent

Product Line:
NQ and NF Panelboards

Environment:
Boxes - Enclosures

Cause:
Clarification-Product features

Resolution:
The D9 suffix option is for the box to be made  9" Deep vs the standard 5.75" Deep.
This option is standard in all Factory assembled 400A-600A NQ/NF Panelboard interiors with a Powerpact L 600A Frame Main breakers.

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