by , on May 27, 2010

Three primary causes for “manhole explosions” are

1. Ignition of combustible or flammable gases or dusts in the manhole

2. Arc Flash

3. A combination of the two.

By law, gases are monitored and these explosions are fairly rare.  Arc flashes are more common when gases are being monitored. 

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Hugh Hoagland
About author:
Hugh Hoagland is the foremost tester of clothing and PPE exposed to electrical arcs and is an arc flash expert. Read more about Hugh.

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