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Probability of Spark Ignition in Intrinsically Safe Circuits.

Authors
Cawley-JC
Source
MISSING :15 pages
Link
NIOSHTIC No.
10006150
Abstract
This report presents results of recent Bureau of Mines research to establish the probability of spark ignition as a function of current (or voltage, for capacitor circuits) for resistive, inductive, and capacitive circuits in 8.3-Pct methane-air atmospheres. The data presented quantify the explosion hazard created when low-power electronic devices catastrophically fail in an explosive mine atmosphere. Previous literature dealt with levels of probability between 10-3 and 10-4. This report extends the probability data to levels as low as 10-7. This study has verified that when the probability of ignition, pi, is plotted on a log-log coordinate system versus the current (or voltage), a continuous, straight-line relationship is formed. An interesting result that can be statistically hypothesized is that at some low level of igniting current the ignition process ceases altogether.
Publication Date
19880101
Document Type
IH; Report of Investigations;
Fiscal Year
1988
NTIS Accession No.
NTIS Price
Identifying No.
RI 9183
NIOSH Division
PRC;
Source Name
MISSING
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