A residential dishwasher not connected to a kitchen sink has a fixture unit rating of _______________.

In the context of plumbing and fixture unit ratings, a residential dishwasher that is not directly connected to a kitchen sink is assigned a fixture unit rating of 2. This rating is part of the system used to estimate the demand that various plumbing fixtures will place on the drainage and water supply systems.

The rating of 2 for a dishwasher reflects its relatively low flow and usage compared to other fixtures that may consume more water or contribute more significantly to the overall plumbing load. It is important for plumbing design and analysis as it helps engineers and plumbers determine the appropriate sizing of pipes, drains, and overall system capacity.

When considering appliances and fixtures, it’s crucial to reference plumbing codes such as the Omaha Plumbing Code to ensure compliance and proper design practices. This ensures that the plumbing system can handle the flow without excessive pressure loss or bottlenecks, ensuring efficient operation and minimizing the risk of clogs or backups. The other choices—0 and 3—do not accurately reflect the standard rating for dishwashers, with 0 indicating no demand and 3 suggesting excessive demand for a typical residential dishwasher application.