Flow control devices for grease traps shall be installed on which of the following?

The requirement for flow control devices for grease traps to be installed on fixtures connected to the grease trap is crucial for ensuring proper function and maintenance of the grease trap system. These devices help to regulate the amount of wastewater entering the grease trap, thereby optimizing its efficiency in separating and retaining grease and solid waste.

By installing flow control devices on fixtures connected to the grease trap, it prevents overloading the grease trap with excessive flow, which could lead to ineffective grease separation and potential plumbing issues. This is particularly important in commercial kitchens where the volume and consistency of wastewater can significantly vary. By managing flow rates, these devices help maintain the effectiveness of the grease trap and ensure compliance with local regulations regarding wastewater management and environmental protection.

The other options, such as kitchen sinks only or bathroom fixtures, do not encompass the entire range of potential sources of grease-laden wastewater that could affect the grease trap's performance. Large industrial drains may also not be applicable due to differing requirements and design considerations for industrial applications. Therefore, the correct focus on all fixtures connected to the grease trap supports comprehensive management of grease in wastewater systems.