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The Cause of an Electric Spark

By Dave Rongey - Summary:

What Causes an Electric Spark: An Explanation of Electrical Sparks and Electric Current Flow.

Why an Electrical Spark May Be Seen or Heard

Electrical Question: What causes an electrical spark when the power was turned off?

Thank you.

This electrical wiring question came from Eva, in Toronto, Canada.

Dave’s Reply:
Thanks for your electrical question Eva.

What Causes an Electric Spark?

Electrical Sparks and Electric Current Flow Explained

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3 Responses to “The Cause of an Electric Spark”
  1. Donna Brua says:

    Thanks. Very helpful.

  2. Dave Rongey says:

    Hi Donna,
    From what you have described the drill may have damaged an electrical cable inside the wall. There is a good possibility that there may be a tripped circuit breaker or other electrical devices that may have been affected. In a situation like this it is always good to open up a section of the drywall so the cable can be inspected. Since the TV will be mounted on the wall then hopefully the opening of the drywall will be located right behind the TV. Nevertheless there should be room enough to see what has happened to the cable.
    Typically when an electrical cable has been damaged inside a wall the circuit is turned off, and a junction box is installed where the cable is damaged and a inline splice is installed for each wire. Other alternatives are to replace one section, or the entire cable run from the preceding junction box to the following. Keep in mind that spliced electrical wires must be enclosed inside a junction box and the junction box must be accessible. This may possibly create an ideal location for an outlet for the wall mounted TV if the cable is being used for an outlet circuit.
    I hope this helps,

  3. Donna Brua says:

    We were hanging a TV on the den wall. The stud finder said we were on a stud but when we drilled, there wasn’t a stud and the drill created an electrical spark when it went into the wall. It is not directly above or below an outlet or switch. Could there be a fire danger? What should we do to ensure everything is safe?