Mining Publication: Influence of Electrode Material on Spark Ignition Probability
Original creation date: January 1992
The testing procedures of the U.S. Mine Safety and Health Administration specify that intrinsic safety acceptance tests be conducted using a standard tungsten-cadmium electrode configuration in the breakflash apparatus. However, in realistic mining environments, other materials may be more likely sources of sparking. Information defining the probability of spark ignition between common materials such as aluminum, brass, copper, lead, tin, cold-rolled steel, and stainless steel is of more practical value in determining ignition hazards. The U.S. Bureau of Mines has completed an investigation of the influence of material on the ignition probability using the breakflash apparatus. By comparing ignition currents or ignition voltages corresponding to a probability of one ignition per thousand sparks to those found previously for cadmium, a margin of safety may be estimated for each material. This report presents the results of an investigation into the influence of disk electrode material on the probability of ignition.
Authors: JS Peterson
Report of Investigations - January 1992
NIOSHTIC2 Number: 10011241
U.S. Department of the Interior, Bureau of Mines, Report of Investigations 9416, 1992 Jan:1-19
See Also
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- Methane Control at Continuous Miner Sections
- Methane-Air Mixtures Ignited by CW Laser-Heated Targets on Optical Fiber Tips: Comparison of Targets, Optical Fibers, and Ignition Delays
- NIOSH Hazard ID 4 - Ignition Hazard from Drilling into Sealed Frames of Agricultural Equipment
- Overview of Dust Explosibility Characteristics
- Rock and Minerals Make up Your World: Rock and Mineral 10-Specimen Kit Companion Book
- Technology News 473 - The Explosion Hazard From Hydrogen Gas Generation Inside Sealed Frames
- Content source: National Institute for Occupational Safety and Health, Mining Program