Massachusetts Plumbers Journeyman Practice Exam

For how many fixtures is a relief vent not required in a battery waste-and-vented system?

1. 1

2. 2

3. 3

4. 4

The correct answer is: 1

In a battery waste-and-vented system, a relief vent is not required for a single fixture. This is based on plumbing code regulations that allow for one fixture to operate without the need for additional venting through a relief vent. The rationale behind this is that a single fixture generally can maintain adequate airflow and pressure balance within the venting system, minimizing the risk of siphoning and allowing proper drainage. When more than one fixture is involved, the potential for changes in pressure and flow increases, which is why additional venting may be necessary for systems with multiple fixtures. This safety measure ensures the system functions effectively and prevents issues such as back pressure or drainage problems that may arise from inadequate venting.