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What is the difference between sub feed lugs, through feed lugs, and sub feed breakers?

Published date: 11 December 2018

Issue:
What is the difference between sub-feed lugs, through-feed lugs, and sub-feed breakers?

Product Line:
Panelboards

Environment:
Applies to NQ and NF Panelboards

Resolution:
  • Sub feed lugs are a replacement set of lugs used in place of the normal main lugs of a panelboard. They allow the installer to subfeed to another panel or device. Sub-Feed Lugs can be used on main lugs interiors.
  • Feed through lugs are a second set of lugs mounted opposite the mains end on the end of the bussing. Feed-Through Lugs can be used on main lug or main breaker interiors.
  • Sub feed breakers are branch breakers mounted opposite the mains end on the end of the bussing. They are used when a branch breaker amp rating is required that is higher than can normally be accommodated on the interior. Sub-feed Breakers can be used on main lugs or main breaker interiors.
See the below picture as a reference.


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