What is the depth of a QMB panel NEMA 1 box?

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Issue:
Dimensions of a QMB NEMA 1 enclosure

Product Line:
QMB Switchboards

Environment:
Switchboards and Switchgear

Resolution:
The standard depth of a NEMA 1 box for a QMB panel is 11.5 inches. If the panelboard is supplied with an optional trim with a door, the depth is 18 inches.