Question 54

The waste outlets cannot be more than 30 inches apart.

For a combination plumbing fixture to be installed on one trap, it is essential that the waste outlets of the fixtures are no more than 30 inches apart to ensure proper drainage and function.

A) Neither outlet can be equipped with a grease interceptor

This option is incorrect because while grease interceptors play a role in certain plumbing configurations, it does not directly address the spatial requirements for installing a combination fixture on one trap.

B) The trap diameter is 1 inch larger than would be required for either element of the combination installed separately

This option is also incorrect. While the trap size may be a consideration in plumbing design, it is not a condition specifically related to the spacing of the waste outlets for a combination fixture.

C) One compartment cannot be more than 12 inches deeper than the other

This choice is incorrect as well. While depth differences may affect drainage, the specific requirement for combining fixtures on one trap relates to the distance between the waste outlets, not depth.

D) The waste outlets cannot be more than 30 inches apart

This option is correct as it directly addresses the necessary condition for installing a combination plumbing fixture on a single trap, ensuring proper drainage and functionality when fixtures are installed together.

Conclusion

The requirement that the waste outlets cannot be more than 30 inches apart is crucial for the effective installation of a combination plumbing fixture on one trap. Other options do not specifically address this spacing requirement, making them irrelevant to the question at hand. Thus, option D is definitively the correct choice.