Question: Where branch-circuit conductors pass through a panelboard and do not originate or terminate…

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Question

Where branch-circuit conductors pass through a panelboard and do not originate or terminate in that panelboard, is there any requirement for identifying where the overcurrent devices are located for these pass-through conductors? TG

Answer

In this instance, the panelboard is serving the function of a pull box for these pass-through conductors. A panelboard is permitted for this purpose if proper wire bending space is provided as per 408.55. Feed-through conductors are permitted in a cabinet that contains overcurrent devices (such as a panelboard) per 312.8. One of the conditions required by 312.8 in permitting this application is that a warning label is required to be applied to the enclosure that identifies the closest disconnecting means for any feed-through conductors. This is a new requirement for the 2011 NEC.
— Keith Lofland, CMP-9

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klofland@iaei.org'
L. Keith Lofland is the Director of Education, Codes and Standards for IAEI. He represents IAEI as a member of Code-Making Panel 9 for the National Electrical Code. He serves on NFPA’s Electrical Section Executive Committee and also is a member of UL’s Electrical Council. He is the principal contributor to several IAEI publications including Analysis of Changes, Soares Grounding and Bonding, and One- and Two-Family Dwelling Electrical Systems. Prior to his position with the International Office of IAEI, Keith spent 16 years with the City of Garland (Texas) serving as their chief electrical inspector during a 21-year career as an electrical inspector. Keith holds a master electrician license from the State of Texas. He also has obtained electrical inspector certifications from IAEI, NFPA/IAEI, and ICC. He served as chairman of the Texas Chapter of IAEI in 1989 and as the secretary/treasurer for the Texas Chapter-IAEI for 10 years from 1995–2004.