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What is the retainer for a backfed QOB2100VH branch mounted Main, in a NQ panel board?

Issue:
Is a retainer needed for a back fed QOB Main breaker ?

Product Line:
NQ Panelboards 

Environment:
Application

Cause:
Inspector 

Resolution:
Due to the breaker already having a "Bolt on" feature , a retainer is not uneccessary. Since securing the breaker to the bussing, via this feature of the breaker, NEC Code for securing backfed Branch as a Main, is satisfied .  

 
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