What is the maximum spacing allowed for supporting 3/0 AWG copper conductors in vertical raceways?

The maximum spacing allowed for supporting 3/0 AWG copper conductors in vertical raceways is determined by the National Electrical Code (NEC) standards, particularly considering the physical characteristics and weight of the conductors. For larger conductors like 3/0 AWG, which are heavier and more rigid, the NEC specifies that they need to be supported at intervals that prevent sagging and movement, ensuring both safety and compliance with electrical code regulations.

In this context, the correct answer indicates that the maximum recommended spacing is 80 feet. This ensures that the conductors are adequately secured and that there is minimal risk of damage or excessive strain on connections due to their weight. Proper support is essential not only for maintaining the integrity of the electrical system but also for ensuring safety and reliability in its operation.

Understanding this regulation helps ensure that installations comply with safety standards, ultimately protecting both the physical infrastructure and the individuals who interact with it.