Underlined text indicates a change in the rules for the 2017 NEC.
Q. What is the Code requirement for supporting conductors in vertical raceways?
Scroll Down to See the Answer
A. If the vertical rise of a raceway exceeds the values shown in Table 300.19(A), each conductor must be supported at the top, or as close to the top as practical. Intermediate support must also be provided in increments that don’t exceed the values in the table.
Caution: The weight of long vertical runs of conductors can cause the conductors to actually drop out of the raceway if they aren’t properly secured. There’ve been many cases where conductors in a vertical raceway were released from the pulling “basket” or “grip” (at the top) without being secured, and the conductors fell down and out of the raceway, injuring those at the bottom of the installation.
These materials are provided to us by Mike Holt Enterprises in Leesburg, Fla. To view Code training materials offered by this company, visit www.mikeholt.com/code