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What is a flashover?

What is a flashover? Here are some definitions.

Noun
  1. The near simultaneous ignition of all combustible material in an enclosed area.
  2. An unintended electric discharge or arc over or around an insulator
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Examples
The use of fire-blocking and low heat-release panels significantly delays flashover, thereby further improving occupant survivability.
Every single piece of steel in the Minster that will conduct electricity is now bonded with the lightning protection system to stop this sort of flashover.
Hereby the flashover or the transition to a fully developed fire is an important target.
In an instant, an avalanche of electrons is rolling over the surface in a catastrophic flashover.
Minutes after they escaped, there was a fire flashover and the whole building went up in flames.
From the time a fire first breaks out to flashover, when everything catches on fire, can take as little as three minutes.

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