A kitchen sink unit or fixture with more than how many fixture units may be connected with a continuous-waste?

In plumbing systems, especially concerning the installation and connection of kitchen sinks, certain standards dictate how many fixture units can be effectively managed with a continuous waste system. A kitchen sink typically has a fixture unit value that determines its capacity for drainage. The accepted standard is that when a kitchen sink unit has one fixture unit, it can be connected to a continuous waste system.

The rationale behind this is primarily based on flow rates and the need to prevent potential backflow or overwhelming the drainage system. A continuous waste line works well for a single unit as it effectively can handle the volume of water and waste produced. When a fixture exceeds this, it might compromise the efficiency of the drainage system and lead to issues like clogs or water backing up, which could occur when too many units are draining simultaneously into a single continuous waste line.

Thus, establishing the guideline of one fixture unit for connection helps maintain an effective and trouble-free drainage system in kitchen installations.