Dry system branch lines shall be pitched at ______ per 10 feet.

Branch lines in a dry sprinkler system must be pitched to facilitate proper drainage in case of condensate buildup within the piping. The correct pitch of 1/2 inch per 10 feet ensures that any moisture can effectively run towards the low point of the system, which helps prevent freezing and other related issues that can compromise system performance.

This specification is crucial in dry pipe systems, as these systems are designed to contain air or nitrogen rather than water, making the management of any condensation particularly important. The chosen pitch supports the operational integrity of the system by allowing for maintenance of the line's water-free status until activation, thereby preventing unnecessary issues during system deployment.