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Electric Arcing At High Voltage During Methane-air Explosions Inside Explosion-proof Enclosures.
MISSING :9 pages
The problem of electric arcing at high voltage during methane-air explosions in explosion-proof enclosures was investigated by the Bureau of Mines, with the following conclusions: (1) the mixture at which arcing is most likely to occur is approximately 9.8 pct methane-air at any given voltage and conductor spacing; (2) arcing will occur before there is any appreciable pressure buildup; and (3) conductor spacings presently required in normal atmosphere are not sufficient when there is the possibility of a methane-air explosion. This report presents information on the clearances between energized conductors, which, in a series of experiments, did prevent arc discharges from occurring as methane-air explosions took place in an explosion-proof enclosure.
Page last reviewed: March 11, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division