Rhode Island Journeyman Plumber Practice Exam

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What is the required separation distance between water service piping and building drain/sewer?

  1. 16 inches

  2. 12 inches

  3. 8 inches

  4. 4 inches

The correct answer is: 12 inches

The required separation distance between water service piping and building drain/sewer is crucial for preventing contamination of the water supply. In Rhode Island, the code mandates that there must be at least 12 inches of vertical separation between these two types of piping when they cross. This requirement ensures that if sewage spills or leaks occur, any contaminants are less likely to enter the potable water supply due to the distance providing a physical barrier against potential leaks or breaches. This is a vital aspect of plumbing design and installation to protect public health and ensure a safe drinking water supply.

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