Wyo. Stat. § 30-3-301: Telephone service or communication facilities; location; insulation; protection; additional standards by rule.

(a) Telephone service or equivalent communication facilities installed to reduce the possibility of interruption of service shall be provided in underground mines at the bottom of each main shaft or slope and in all mines from the surface to the working sections of the mine.

(b) Telephone lines, other than cables, shall be:

(i) Carried on insulators;

(ii) Installed on the opposite side from power or trolley wires;

(iii) Adequately insulated where they cross power or trolley wires.

(c) Telephone circuits shall be protected by lightning arresters.

(d) The inspector shall adopt additional rules for telephone and communication safety.