Technical FAQs

Ask a Question

What is the maximum ampere rating for NQOD branch breakers?

Issue:
QO and QOB branch breakers on a NQOD panelboard what is the maximum amperage rating can be installed?

Product Line:
Panelboard

Environment:
UL 67, UL 50, CSA C22.2 No.'s 20-M1989 & 94-M91, NEMA PB1, NFPA 70 Art. 408, Federal Specification W-P-115C Type 1 Class 1 , 2003 IBC, NFPA 5000, ASCE/SE17

Resolution:
NOTE:  NQOD panelboards are obsolete, superseded by NQ.  The QOB3150VH is the largest field installable branch breaker. It requires 6 pole spaces.  Also, the branch breakers mounted opposite cannot exceed a 20A rating due to the ampere rating of the branch breaker connector these breakers would share.

Larger amperages (sub-feed breakers) are available as factory assembled only.


 
Was this helpful?
What can we do to improve the information ?