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The Probability of Spark Ignition in Intrinsically Safe Circuits.
Proc the 9th WVU Int'l Mining Electrotechnology Conf 1988 :3 pages
The U.S. Bureau of Mines has completed research to empirically estimate the probability of spark ignition in resistor, inductor, and capacitor circuits in 8.3 pct methane-air mixtures. Tabular and graphical data are presented for currents and voltages that correspond to probabilities of spark ignition from 10-3 to 10-7. Data are presented in the format used in Underwriter's Laboratories Standard UL 913, to provide a quick, graphical reference. Statistics are presented that indicate that for spark ignition probabilities between 10-5 and 10-7, depending upon component and test parameter values, the ability to cause spark ignition by electrical means ceases.
Proc. the 9th WVU Int'l Mining Electrotechnology Conf., 1988, PP. 125-127
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division