CFR > Title 29 - Labor > SUBTITLE B—Regulations Relating to Labor > CHAPTER XVII—OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR (parts 1900 to 1990) > PART 1926—SAFETY AND HEALTH REGULATIONS FOR CONSTRUCTION > SUBPART CC—Cranes and Derricks in Construction (§1926.1400 to §1926.1442) > 1926.1420—Signals—radio, telephone or other electronic transmission of signals.

1926.1420—Signals—radio, telephone or other electronic transmission of signals.

(a) The device(s) used to transmit signals must be tested on site before beginning operations to ensure that the signal transmission is effective, clear, and reliable.
(b) Signal transmission must be through a dedicated channel, except:
(1) Multiple cranes/derricks and one or more signal persons may share a dedicated channel for the purpose of coordinating operations.
(2) Where a crane is being operated on or adjacent to railroad tracks, and the actions of the crane operator need to be coordinated with the movement of other equipment or trains on the same or adjacent tracks.
(c) The operator's reception of signals must be by a hands-free system.