Massachusetts Plumbers Journeyman Practice Exam

What size drain should commercial food-waste grinder units be connected to?

1. ¾ inches

2. One inch

3. One and a half inches

4. Two inches

The correct answer is: Two inches

The correct connection size for commercial food-waste grinder units is typically two inches. This larger diameter is necessary to accommodate the high volume of waste generated by commercial food operations, ensuring that waste can flow freely without causing clogs or backflow issues. A two-inch drain provides sufficient capacity to handle the solid waste particles ground by the unit, minimizing the risk of drainage problems often associated with smaller drain sizes. Using a smaller drain size, such as those listed in other options, may lead to blockages and inefficient waste disposal. The design of commercial food-waste systems anticipates a significant influx of waste materials, which is why adhering to industry standards for drain size is critical for proper operation and longevity of the plumbing infrastructure.