Archive for January 13th, 2016

Why Do Manholes Fly Into the Air Sometimes?

Frp manhole covers

Did you know that even the most heavy duty manhole covers can explode, sending hundreds of pounds of metal skyrocketing into the air? Though it may seem strange — and it 100% is weird — there’s a perfectly rational explanation.

You see, what happens when manholes explode is an explosion. Aging, corrosive chemicals, overloads, and the biting of rats can fray underground cables, which carry about 13,000 volts of electricity.

These wires heat up the insulation, causing it to smolder, catch fire, and release gases. This is where things start to get hairy. It’s these gasses that build up inside manholes, waiting for something to wrong.

And of course, something does go wrong. The electrical wires arc like a bolt of lightning a

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