Arizona Plumbing Practice Exam 2026 – Complete Preparation Guide

Question: 1 / 400

Copper water piping, 1-1/4 inch and smaller, must be supported every how many feet horizontally?

4 feet

6 feet

Copper water piping with a diameter of 1-1/4 inch and smaller must be supported horizontally every 6 feet. This requirement is put in place to ensure the structural integrity of the piping system and to prevent sagging or bending that could lead to leaks or failure over time. Proper support helps maintain the alignment of the pipes and reduces stress that could lead to eventual wear, especially in areas subjected to vibrations or thermal expansion.

It is important to adhere to these support guidelines as they are established by plumbing codes to ensure safety and reliability in plumbing installations. Supporting the pipes at the specified intervals allows for proper drainage, thermal expansion, and contraction of the pipes in different temperature environments.

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8 feet

10 feet

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