Master Plumber Practice Exam

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Prepare for the Master Plumber Exam. Use practice questions, flashcards, and detailed explanations. Ace your test with confidence!

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Above ground schedule 40 PVC and ABS DWV plastic piping installed horizontally shall be supported at intervals not to exceed what?

A 10 feet
B 6 feet
C 2 feet
D 4 feet

The correct answer is: D 4 feet

The maximum support interval for above ground schedule 40 PVC and ABS DWV plastic piping installed horizontally is crucial for maintaining the integrity of the plumbing system. Supporting the pipes appropriately helps to prevent sagging, bending, or breaking, which can lead to leaks or other plumbing failures. Schedule 40 PVC and ABS have specific requirements regarding their installation to ensure they perform effectively in drainage, waste, and vent systems. The reason for the chosen support interval of 4 feet is based on industry standards that dictate the maximum distance between supports to prevent excessive stress on the piping. At intervals greater than 4 feet, the potential for damage increases, especially when the pipe is subject to weight or environmental factors. By adhering to this 4 feet rule, plumbers ensure that the piping maintains its proper shape and function, ultimately contributing to the longevity and reliability of the plumbing system. This standard reflects best practices in plumbing installation and is designed to mitigate risks associated with improper support of plastic piping materials.