Vertical runs of metal wireways must be securely supported at intervals not exceeding how many feet, with no more than one joint between supports?

Vertical runs of metal wireways must be securely supported at intervals not exceeding 10 feet, with the requirement that there is no more than one joint between supports. This ensures that the wireways are safely anchored, minimizing the risk of sagging or mechanical stress, which could lead to potential damage or hazards over time. Supporting them at intervals greater than specified could lead to stability issues, and having more than one joint between supports may compromise the integrity and safety of the installation.

While 25 feet is too generous an interval for supporting metal wireways, it's crucial to adhere closely to established safety standards, which emphasize the importance of regular support to maintain the system's functionality and safety.