Labor Code section 7963

All underground mines and tunnels with more than five men underground at one time shall have telephone or other communication systems to the surface in operation at any time there are persons underground. Such systems shall be installed in such a manner that destruction or removal of one phone or communication device does not make other phones or communication devices inoperative.

Source: Section 7963, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=LAB§ionNum=7963. (updated Jan. 1, 1972; accessed Jun. 16, 2025).

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Verified:
Jun. 16, 2025

§ 7963’s source at ca.gov

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Location: https://california.public.law/codes/labor_code_section_7963

Original Source: Section 7963, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=LAB§ionNum=7963. (last accessed May 12, 2025).