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Can an R Frame Main Breaker in an HCP/HCRU I-Line Panelboard be Top Mounted?

Issue:
Can an R Frame Powerpact main breaker in an HCP/HCRU I-Line panelboard be top mounted?

Product Line:
I-Line panelboards and accessories sold and supported in the USA.

Environment:
Installation

Cause:
Incoming condutor location 

Resolution:
No.  Heat rise limits where the R frames can be mounted in an enclosure.  The factory will always install them in the lowest location in the panelboard.
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