flashover
Noun: 1. A sudden, unintended electrical discharge over or around an insulator: A flashover is a disruptive electrical event where electricity arcs or jumps across a gap, such as over the surface of an insulator or between conductors, often caused by high voltage or insulation failure. 2. The moment a fire spreads very rapidly across an area: In fire science, a flashover is the dangerous stage in a fire's development when heat builds up to the point that all combustible surfaces in a space simultaneously ignite.
- Electrical Engineering Context:
- The high voltage caused a flashover across the ceramic insulator, damaging the power line.
- Protective equipment is designed to prevent a flashover during a lightning strike.
- Firefighting Context:
- Firefighters must recognize the signs of an impending flashover to evacuate in time.
- The room reached flashover just seconds after the firefighters exited.
- "To flash over" (verb phrase): The action of experiencing a flashover.
- The damaged cable could flash over if the power is restored.
- The compartment flashed over, engulfing the entire room in flames.
- Arc (noun/verb): A luminous electrical discharge; a more general term for an electrical flashover.
- Insulator (noun): A material or device that prevents the flow of electricity, which a flashover can bypass.
- Electrical discharge
- Arc fault
- (For fire context) Simultaneous ignition
The word flashover has two distinct, specialized meanings: 1. The primary and most common meaning in general engineering and electrical contexts is the unintended electrical discharge. 2. The meaning related to fire behavior is highly technical and specific to fire science and emergency services. The context of the sentence will always make it clear which meaning is intended.
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an unintended electric discharge (as over or around an insulator)
