16th October 2019


What is the difference between an arc flash and arc blast?

An electric “arc” is a discharge of current through the air. What is the difference between arc flash and arc blast? “Arc flash” is the extremely high-temperature discharge produced by an electrical fault in air. “Arc blast” is a high-pressure sound wave caused by a sudden arc fault.

Consequently, why do Arc flashes occur?

An Arc Flash occurs during a fault, or short circuit condition, which passes through this arc gap. An Arc Flash event can expel large amounts of deadly energy. The arc causes an ionization of the air, and arc flash temperatures can reach as high as 35,000 degrees Fahrenheit. This is hotter than the surface of the sun.

What is an electrical arc blast?

An arc flash (also called a flashover), is the light and heat produced as part of an arc fault, a type of electrical explosion or discharge that results from a low-impedance connection through air to ground or another voltage phase in an electrical system.

What causes an arc fault?

An arc-fault occurs when loose or corroded connections make intermittent contact and causes sparking or arcing between the connections. This translates into heat, which will break down the insulation of the wire and can be the trigger for an electrical fire.
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