On the NQ type panelboards that are suitable for use as service entrance, what precautions/steps are taken to prevent additional breakers from being added to the panel?

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Issue:
Precautions taken to prevent additional breakers from being added to the NQ type panelboards that are suitable for use as service entrance

Product LIne:
PTFDS FD Enclosure Systems

Environment:
NQ panelboards sold and used in North America

Cause:
Can additional branch breakers be added to a service entrance NQ panelboard?

Resolution:
Factory Assembled panels have non-reversing screws installed in the unusable branch connectors to prevent additional breakers from being installed.