I have a central feed with branch lines that extend approximately 30 ft to the left and right. The branch line is around 24" above the feed, so there is a short stub up to the branch line. According to NFPA 13, the max restraint spacing should be 46 ft for Cp and the pipe diameter. I understand that restraints must be provided at each end of the branch, but is an additional restraint required near the middle (60 ft total length)? Does the drop / connection to the feed negate the need for a more centrally located restraint on the branch?