At each mine operated by a shaft, the means of signaling to and from the bottom man, the top man, and the engineer shall consist of a tube, or tubes, of wire encased in wood or iron pipes, through which signals shall be communicated by electricity, compressed air, or other devices.
All proper precautions shall be taken to prevent electric signal and telephone wires from coming into contact with other electric conductors, whether insulated or not.
Bells, wires, insulators, contact-makers, and other apparatus used in connection with electric signaling underground, shall be of substantial and reliable construction, and be erected in such a manner as to reduce failures or false signals to a minimum.
In any mine, signal circuits for operating lamps or other signal devices at potentials exceeding twenty-five volts shall be adequately insulated and considered as power circuits and shall be installed as such.
The following signals are provided for use at mines where signals are required:
No operator of a mine shall refuse or neglect to comply with this section.
R.C. §1567.51