A shower waste shall run independent of other fixtures directly to a _______ inch or larger waste.

For shower drainage in plumbing code, it is essential that the waste line runs independently to ensure proper drainage and prevent any backflow or blockage from other fixtures. The requirement for the waste line to be at least 3 inches in diameter is aligned with standard plumbing practices, as a 3-inch pipe provides adequate capacity for the volume of water that showers typically discharge.

Using a 3-inch or larger waste pipe allows for better flow rates, reducing the risk of clogs and allowing for the effective management of wastewater. This size is particularly important because showers can generate a significant amount of water in a short period, and a smaller pipe may lead to slow drainage or overflow issues. A 2-inch line may not meet the necessary capacity for a shower, which is why the 3-inch specification is crucial for maintaining optimal performance and complying with plumbing codes.