Massachusetts Plumbers Journeyman Practice Exam

Where should laundries be connected in buildings with more than three branch intervals?

1. Independent laundry stack

2. Independent laundry main drain

3. Building drain

4. Suds relief vent

The correct answer is: Independent laundry main drain

In buildings with more than three branch intervals, it is essential to connect laundries to an independent laundry main drain. This is because an independent main drain specifically accommodates the volume and characteristics of water discharged from washing machines, allowing for better management of the wastewater and preventing potential clogs or backflows in the plumbing system. By using an independent laundry main drain, it helps to ensure that any suds or lint produced during the wash cycle are efficiently removed from the system, reducing the risk of buildup in branch lines or other drainage components. This becomes increasingly important as the complexity of the plumbing system grows with additional branch intervals, as the chances of interference with other systems increase. Using this dedicated drainage solution enhances overall plumbing efficiency and maintains better sanitation, making it the ideal choice for laundry connections in larger buildings.