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.
Cal. Lab. Code § 7963
Tunnels and Mines
Known as the The Tom Carrell Memorial Tunnel and Mine Safety Act
The act spans §§ 7950–8004 (52 sections).
Added by Stats. 1972, Ch. 1430.
Official source: California Legislative Information. Reproduced from public-domain California statutes; confirm against the official source for the current text. Not legal advice.