An Investigation of the Ignition Hazards Associated With Various Materials in the Breakflash Apparatus.
Paper in 1991 II:1254-1262
The U.S. Bureau of Mines Pittsburgh Research Center has completed an investigation of the degree to which various disk materials affect the probability of igniting a methane-air atmosphere using the breakflash machine. Data were generated for estimating currents (resistor or inductor circuits) and voltages (capacitor circuits) associated with a particular ignition level. Further analysis of these data was used to assign hazard levels for each material, with cadmium used as a reference material. From this, a safety factor was associated with each material. Presently, there are no construction requirements with regard to materials of construction. The worst case is always assumed (i.e., cadmium). Laboratory test results confirmed cadmium as the worst case material among those tested for resistor and inductor circuits but not for capacitor circuits.
Paper in 1991 IEEE Ind. Appl. Soc. Ann. Mtg., Vol. II. IEEE Service Center, PP. 1254-1262