Definitions for flashoverˈflæʃˌoʊ vər
This page provides all possible meanings and translations of the word flashover
Random House Webster's College Dictionary
a disruptive electrical discharge around or over the surface of a solid or liquid insulator.
Category: Electricity and Magnetism
Origin of flashover:
an unintended electric discharge (as over or around an insulator)
The near simultaneous ignition of all combustible material in an enclosed area.
An unintended electric discharge or arc over or around an insulator
A flashover is the near-simultaneous ignition of most of the directly exposed combustible material in an enclosed area. When certain organic materials are heated they undergo thermal decomposition and release flammable gases. Flashover occurs when the majority of the exposed surfaces in a space are heated to their autoignition temperature and emit flammable gases. Flashover normally occurs at 500 °C or 1,100 °F for ordinary combustibles, and an incident heat flux at floor level of 1.8 Btu/ft²*s. An example of flashover is when a piece of furniture is ignited in a domestic room. The fire involving the initial piece of furniture can produce a layer of hot smoke which spreads across the ceiling in the room. The hot buoyant smoke layer grows in depth, as it is bounded by the walls of the room. The radiated heat from this layer heats the surfaces of the directly exposed combustible materials in the room, causing them to give off flammable gases via pyrolysis. When the temperatures of the evolved gases become high enough, these gases will ignite, throughout their extent.
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