Arizona Plumbing Practice Exam

In fire sprinkler systems, it's crucial to ensure that the piping is adequately supported to prevent sagging and potential failure under pressure. For a branch pipe with a nominal size of 1 1/4 inches, the code specifies that the last support hanger should be placed no more than 48 inches from the end of the branch. This distance ensures there is sufficient support to maintain the integrity and proper functioning of the sprinkler system.

Maintaining the specified distance helps reduce stress on joints and promotes the longevity of the system. While other choices present values greater than 48 inches, accepting those would violate standard plumbing and fire protection codes intended to ensure safety and reliability in fire suppression systems. Thus, the specified maximum distance of 48 inches is vital for adherence to industry regulations and providing adequate support for the pipe.