OAR 437-007-1520: Four Inch Tie-In Systems

(1) Use a belay (snubbing) system, with dynamic rope, when climbing above the 4-inch bole diameter in conifers or above the last secure tie-in point capable of providing life support in hardwoods. (2) Install 4-inch tie-in system protection (rigging points) at least every 3 feet along the bole or branch to limit falls to no more than 6 feet. (3) Climbers must not: (a) Place side loads on the carabiner gate. (b) Use static cordage for applications where dynamic loading could occur.