What is the maximum distance allowed from the end of a 1 1/4 inch copper line to the last hanger?

The correct answer is based on the regulations and standards governing the installation of piping systems, particularly for copper lines. The maximum distance allowed from the end of a 1 1/4 inch copper line to the last hanger is specified to ensure that the piping is properly supported.

By allowing a maximum distance of 24 inches, the installation accommodates for the weight of the pipe and any potential stresses that could arise from temperature changes or water flow within the system. Adequate support minimizes the risk of sagging, which could lead to mechanical failure or leaks.

Understanding the requirements for hanger spacing is crucial for maintaining the integrity and safety of plumbing systems, as proper installation reduces the likelihood of damage over time. Therefore, the standard of 24 inches provides a balanced approach to support, safety, and performance.