Section 27-23. Protection against fire hazard in connection with rock work

In all places were workplaces are designed, constructed, fitted out and used, put into operation or maintained, suitable measures shall be taken to prevent the outbreak and spread of fire. Measures shall be taken so that any outbreak of fire can be stopped quickly and effectively.
The amount of combustible materials that is kept underground shall be limited to what is absolutely necessary.
When it is necessary to use hydraulic fluids, such use shall, as far as possible, be limited to fluids that are not easily ignitable so as to avoid the risk of fire and spread of fire. The hydraulic fluids must satisfy specifications and test conditions relating to fire resistance and hygiene criteria.
If hydraulic fluids are used that are not in accordance with such specifications, conditions and criteria, further precautions shall be taken to avoid increasing the risk of fire and spread of fire.