Master Plumber Practice Exam

The building sewer is primarily determined by the fixture unit loading outlined in Table 7-8, which provides specific information regarding the hydraulic requirements for various types of fixtures. This table helps to quantify the potential flow from the plumbing fixtures within a building, taking into account factors such as the type and volume of water that each fixture contributes to the overall drainage system. Using Table 7-8 ensures that the building sewer is adequately sized to handle the maximum expected load from all connected fixtures. This consideration is crucial to prevent problems related to inadequate drainage capacity, which could lead to clogs, backups, or system failures. While other options might reference fixtures or drainage considerations, they do not provide the comprehensive, standardized approach that Table 7-8 embodies. By focusing specifically on the fixture unit loading, the correct choice emphasizes the importance of designing sewer systems based on actual usage rather than solely on maximum fixture load or even referencing the same tables used for building drains, which may not encompass the sewer considerations adequately.