Can I apply the series rating for a main lugs only panelboard if I do not know what the breaker immediately upstream (which feeds the panelboard) is?

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Issue:
Selection based in series rating

Product Line:
Panelboards

Environment:
UL, NEMA, NFPA 70

Cause:
Gathering the necessary information for an installation involving existing equipment can be challenging on occasion.

Resolution:
No, Series Ratings only apply to Square D breakers or fuses that have been tested and approved.