§ 7983
44 words·~1 min read·
/ca/labor-code/7983A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
The main fan line used for ventilation in any tunnel or underground mine classified extrahazardous shall contain a cutoff switch capable of halting all machinery underground automatically should the fan fail or its performance fall below minimum power needed to maintain a safe atmosphere.