Labor Code section 7500

In all mines operated in the State where a depth of more than five hundred feet underground has been reached, a telephone system shall be established, equipped and maintained by the owners or lessees of the mine with stations at each working level below the depth aforesaid, communicating with a station on the surface of the mine.

Source: Section 7500, https://leginfo.­legislature.­ca.­gov/faces/codes_displaySection.­xhtml?lawCode=LAB§ionNum=7500.­ (updated Jan. 1, 1937; accessed Jul. 28, 2025).

Green check means up to date. Up to date

Verified:
Jul. 28, 2025

§ 7500's source at ca​.gov