During performance of an activity underground described in Table C-2 or when falling sparks or hot metal from work performed in a shaft, raise, or winze could pose a fire hazard-
Table C-2
Activity | Distance | Fire hazard |
Welding or cutting with an electric arc or open flame | More than 1 gallon of combustible liquid, unless in a closed, metal container. | |
Using an open flame to bend or heat materials | Within 35 feet of- | More than 50 pounds of non-fire-retardant wood. |
Thawing pipes electrically, except with heat tape | More than 10 pounds of combustible plastics. | |
Soldering or thawing with an open flame | Within 10 feet of- | Materials in a shaft, raise, or winze that could be ignited by hot metal or sparks. |
30 C.F.R. §57.4660