What is the discharge size required for the inspector's test connection?

The discharge size required for the inspector's test connection is crucial for ensuring that the fire protection system is functioning properly. When the test connection is equal in size to the smallest sprinkler, it ensures that the system can adequately simulate the flow conditions of the smallest sprinkler in operation. This is important because if the test connection were larger, it could potentially lead to misleading results about the system's performance under actual fire conditions.

Using a size equal to the smallest sprinkler allows the inspector to effectively evaluate the hydraulic performance of the entire system. It confirms that the system can deliver the required water supply to even the most restrictive components, ensuring that all areas of the building are adequately protected.

In contrast, if the discharge size is smaller than what is needed, it may not provide an accurate representation of system pressure and flow characteristics during an actual fire event, leading to a failure to detect potential deficiencies in the system. A larger size could also cause discrepancies in pressure readings and might not reflect conditions typical of sprinkler operation. Thus, having the test connection match the size of the smallest sprinkler is essential for an accurate assessment of the system’s readiness and reliability.