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SESK: Stuff Everyone Should Know · sesk.info/elec-afci-recognizes-arcing

The Article 100 definition says an AFCI protects by recognizing what?

AFCIs recognize characteristics unique to arcing.

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  1. Characteristics unique to arcing ✔
  2. Current leaking to ground
  3. Voltage that is too high

Why: An AFCI is a device that provides protection from the effects of arc faults by recognizing characteristics unique to arcing. It then de-energizes the circuit.

Huh, didn't know that: Arcing faults are blamed for starting more than 28,000 home fires a year, according to the ESFI figure cited in the article.

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A sweater I bought was picking up static electricity. So I returned it to the store. They gave me another one free of charge.
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References

Answer: Characteristics unique to arcing. An AFCI is a device that provides protection from the effects of arc faults by recognizing characteristics unique to arcing. It then de-energizes the circuit.

  1. EC&M: The Apprentice's Guide to AFCIs and the NEC www.ecmweb.com/safety/article/55265078/the-apprentices-guide-to-afcis-and-the-nec
    device intended to provide protection from the effects of arc faults by recognizing characteristics unique to arcing
    Checked 2026-10-10.

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