49 CFR § 236.71
Signal wires on pole line and aerial cable
November 18, 2020
Signal wire on pole line shall be securely tied in on insulator properly fastened to crossarm or bracket supported by pole or other support. Signal wire shall not interfere with, or be interfered by, other wires on the pole line. Aerial cable shall be supported by messenger.
[49 FR 3384, Jan. 26, 1984]