CSLB Class B General Contractor's License Practice Exam

In the context of plumbing, what is an appropriate slope for condensate drain lines per foot?

1. 1/8 inch

2. 1/4 inch

3. 1/2 inch

4. 3/4 inch

The correct answer is: 1/8 inch

For condensate drain lines, an appropriate slope is 1/8 inch per foot. This slope is designed to ensure proper drainage of condensate, which is vital in preventing water from pooling within the lines. A slope that is too steep, such as 1/4 inch or more, may cause the condensate to flow too quickly, potentially leading to issues like inadequate drainage or air being drawn into the line, which can disrupt the proper functioning of the system. Conversely, a slope that is too shallow may result in clogging and stagnant water, undermining the purpose of the drainage line. In summary, the 1/8 inch slope per foot strikes a balance that allows for effective drainage while minimizing the risks associated with both excessive speed and insufficient flow. This makes it the most appropriate choice for condensate drain lines in plumbing systems.