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What is the maximum number of 70A or larger breakers that can be mounted in an NQ panel before selectors requires a double tub configuration ?

Issue:
Single tub  240V  400A panel with many large ampacity breakers
Product Line:
Panelboards
Environment:
NQ
Cause:
Maximum fill
Resolution:
Only up to five branch circuit breakers rated 70A or larger may be mounted in such an NQ panelboard due to the available branch neutral termination provisions. If greater than five such breakers are required, use either an NF panelboard (which permits up to eight breakers rated 70A or higher) or an I-Line panelboard.
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